# ARKit in visionOS C API Integrate ARKit with low-level libraries and functionality. ## Discussion ARKit in visionOS includes a full C API for compatibility with C and Objective-C apps and frameworks. ## Topics ### Sessions [`typedef NSObject * ar_session_t;`](/documentation/ARKit/ar_session_t) The main entry point for receiving data from ARKit. [`extern ar_session_tar_session_create();`](/documentation/ARKit/ar_session_create) Creates a new session. [`extern ar_session_tar_session_create_with_device(ar_device_t device);`](/documentation/ARKit/ar_session_create_with_device) Create a session connected to the specified device. [`extern void ar_session_query_authorization_results(ar_session_t session, ar_authorization_type_t authorization_types, ar_authorization_results_handler_t results_handler);`](/documentation/ARKit/ar_session_query_authorization_results) Checks whether the current session is authorized for particular authorization types without requesting authorization. [`extern void ar_session_query_authorization_results_f(ar_session_t session, ar_authorization_type_t authorization_types, void *context, ar_authorization_results_handler_function_t results_handler_function);`](/documentation/ARKit/ar_session_query_authorization_results_f) Checks whether the current session is authorized for particular authorization types without requesting authorization. [`extern void ar_session_request_authorization(ar_session_t session, ar_authorization_type_t authorization_types, ar_authorization_results_handler_t results_handler);`](/documentation/ARKit/ar_session_request_authorization) Requests authorization from the user to use the specified kinds of ARKit data. [`extern void ar_session_request_authorization_f(ar_session_t session, ar_authorization_type_t authorization_types, void *context, ar_authorization_results_handler_function_t results_handler_function);`](/documentation/ARKit/ar_session_request_authorization_f) Requests authorization from the user to use the specified kinds of ARKit data. [`extern void ar_session_run(ar_session_t session, ar_data_providers_t data_providers);`](/documentation/ARKit/ar_session_run) Runs a session with the data providers you supply. [`extern void ar_session_set_authorization_update_handler(ar_session_t session, dispatch_queue_t authorization_update_queue, ar_authorization_update_handler_t authorization_update_handler);`](/documentation/ARKit/ar_session_set_authorization_update_handler) Sets the handler for receiving updates in authorization status for a specific authorization type. [`extern void ar_session_set_authorization_update_handler_f(ar_session_t session, dispatch_queue_t authorization_update_queue, void *context, ar_authorization_update_handler_function_t authorization_update_handler_function);`](/documentation/ARKit/ar_session_set_authorization_update_handler_f) Sets the handler for receiving updates in authorization status for a specific authorization type. [`extern ar_data_providers_tar_session_copy_data_providers(ar_session_t session);`](/documentation/ARKit/ar_session_copy_data_providers) Get a copy of the collection of all data providers on this session. [`extern void ar_session_set_data_provider_state_change_handler(ar_session_t session, dispatch_queue_t queue, ar_session_data_provider_state_change_handler_t data_provider_state_change_handler);`](/documentation/ARKit/ar_session_set_data_provider_state_change_handler) Sets the handler for responding to a state change of one or more data providers. [`extern void ar_session_set_data_provider_state_change_handler_f(ar_session_t session, dispatch_queue_t queue, void *context, ar_session_data_provider_state_change_handler_function_t data_provider_state_change_handler_function);`](/documentation/ARKit/ar_session_set_data_provider_state_change_handler_f) Sets the handler function for responding to a state change of one or more data providers. [`typedef void (^)(NSObject *, ar_data_provider_state_t, NSObject *, NSObject *) ar_session_data_provider_state_change_handler_t;`](/documentation/ARKit/ar_session_data_provider_state_change_handler_t) A handler that the session calls when one or more data providers associated with it change state. [`extern void ar_session_stop(ar_session_t session);`](/documentation/ARKit/ar_session_stop) Stops a session. [`typedef NSObject * ar_device_t;`](/documentation/ARKit/ar_device_t) Represents a physical device that a session can be run on. ### Memory Management [`extern void ar_release(void *object);`](/documentation/ARKit/ar_release-c.func) Releases a reference count on an ARKit object. [`extern void *ar_retain(void *object);`](/documentation/ARKit/ar_retain-c.func) Adds a reference count to an ARKit object. ### Authorization [`typedef enum { ... } ar_authorization_status_t;`](/documentation/ARKit/ar_authorization_status_t) The authorization states for a type of ARKit data. [`typedef enum { ... } ar_authorization_type_t;`](/documentation/ARKit/ar_authorization_type_t) The authorization types you can request from ARKit. [`extern ar_authorization_type_t ar_authorization_result_get_authorization_type(ar_authorization_result_t authorization_result);`](/documentation/ARKit/ar_authorization_result_get_authorization_type) Gets the authorization type associated with an authorization result. [`extern ar_authorization_status_t ar_authorization_result_get_status(ar_authorization_result_t authorization_result);`](/documentation/ARKit/ar_authorization_result_get_status) Gets the authorization status associated with an authorization result. [`extern void ar_authorization_results_enumerate_results(ar_authorization_results_t authorization_results, ar_authorization_results_enumerator_t authorization_results_enumerator);`](/documentation/ARKit/ar_authorization_results_enumerate_results) Enumerates a collection of authorization results. [`extern void ar_authorization_results_enumerate_results_f(ar_authorization_results_t authorization_results, void *context, ar_authorization_results_enumerator_function_t authorization_results_enumerator_function);`](/documentation/ARKit/ar_authorization_results_enumerate_results_f) Enumerates a collection of authorization results. [`extern size_t ar_authorization_results_get_count(ar_authorization_results_t authorization_results);`](/documentation/ARKit/ar_authorization_results_get_count) Gets the number of authorization results in a collection. [`ar_authorization_status_allowed`](/documentation/ARKit/ar_authorization_status_t/ar_authorization_status_allowed) Your app has permission to use the associated kind of ARKit data. [`ar_authorization_status_denied`](/documentation/ARKit/ar_authorization_status_t/ar_authorization_status_denied) Your app doesn’t have permission to use the associated kind of ARKit data. [`ar_authorization_status_not_determined`](/documentation/ARKit/ar_authorization_status_t/ar_authorization_status_not_determined) Permission for your app to use the associated kind of ARKit data is undetermined. [`typedef NSObject * ar_authorization_result_t;`](/documentation/ARKit/ar_authorization_result_t) An authorization result. [`typedef _Bool (^)(NSObject *) ar_authorization_results_enumerator_t;`](/documentation/ARKit/ar_authorization_results_enumerator_t) A handler for enumerating a collection of authorization results. [`typedef void (^)(NSObject *, NSObject *) ar_authorization_results_handler_t;`](/documentation/ARKit/ar_authorization_results_handler_t) A handler to call upon completion of an authorization request. [`typedef NSObject * ar_authorization_results_t;`](/documentation/ARKit/ar_authorization_results_t) A collection of authorization results. [`typedef void (^)(NSObject *) ar_authorization_update_handler_t;`](/documentation/ARKit/ar_authorization_update_handler_t) A handler for receiving updates in authorization status for a specific authorization type. [`typedef void (*)(void *, NSObject *, NSObject *) ar_authorization_results_handler_function_t;`](/documentation/ARKit/ar_authorization_results_handler_function_t) [`typedef void (*)(void *, NSObject *) ar_authorization_update_handler_function_t;`](/documentation/ARKit/ar_authorization_update_handler_function_t) [`typedef _Bool (*)(void *, NSObject *) ar_authorization_results_enumerator_function_t;`](/documentation/ARKit/ar_authorization_results_enumerator_function_t) ### Anchors [`extern void ar_anchor_get_identifier(ar_anchor_t anchor, uuid_t out_identifier);`](/documentation/ARKit/ar_anchor_get_identifier) Gets the unique identifier that distinguishes this anchor from all other anchors. [`extern CFTimeInterval ar_anchor_get_timestamp(ar_anchor_t anchor);`](/documentation/ARKit/ar_anchor_get_timestamp) Gets the timestamp corresponding to the anchor. [`extern simd_float4x4 ar_anchor_get_origin_from_anchor_transform(ar_anchor_t anchor);`](/documentation/ARKit/ar_anchor_get_origin_from_anchor_transform) Gets the transform from the anchor to the origin coordinate system. [`extern bool ar_trackable_anchor_is_tracked(ar_trackable_anchor_t anchor);`](/documentation/ARKit/ar_trackable_anchor_is_tracked) Returns a Boolean value that indicates whether ARKit is tracking an anchor. [`typedef NSObject * ar_anchor_t;`](/documentation/ARKit/ar_anchor_t) The identity, location, and orientation of an object in world space. [`typedef NSObject * ar_mesh_anchor_t;`](/documentation/ARKit/ar_mesh_anchor_t) A surface’s position in a person’s surroundings. [`typedef NSObject * ar_mesh_anchors_t;`](/documentation/ARKit/ar_mesh_anchors_t) A collection of mesh anchors. [`typedef _Bool (^)(NSObject *) ar_mesh_anchors_enumerator_t;`](/documentation/ARKit/ar_mesh_anchors_enumerator_t) A handler for enumerating a collection of mesh anchors. [`typedef NSObject * ar_image_anchor_t;`](/documentation/ARKit/ar_image_anchor_t) A 2D image’s position in a person’s surroundings. [`typedef NSObject * ar_image_anchors_t;`](/documentation/ARKit/ar_image_anchors_t) A collection of image anchors. [`typedef _Bool (^)(NSObject *) ar_image_anchors_enumerator_t;`](/documentation/ARKit/ar_image_anchors_enumerator_t) A handler for enumerating a collection of image anchors. [`typedef NSObject * ar_hand_anchor_t;`](/documentation/ARKit/ar_hand_anchor_t) A hand’s position in a person’s surroundings. [`typedef NSObject * ar_trackable_anchor_t;`](/documentation/ARKit/ar_trackable_anchor_t) An anchor that can gain and lose its tracking state over the course of a session. [`typedef NSObject * ar_world_anchor_t;`](/documentation/ARKit/ar_world_anchor_t) A fixed location in a person’s surroundings. [`typedef NSObject * ar_world_anchors_t;`](/documentation/ARKit/ar_world_anchors_t) A collection of world anchors. [`typedef _Bool (^)(NSObject *) ar_world_anchors_enumerator_t;`](/documentation/ARKit/ar_world_anchors_enumerator_t) A handler for enumerating a collection of world anchors. [`typedef enum { ... } ar_world_anchor_sharing_availability_t;`](/documentation/ARKit/ar_world_anchor_sharing_availability_t) Enumeration indicating the availability of world anchor sharing. [`typedef NSObject * ar_plane_anchor_t;`](/documentation/ARKit/ar_plane_anchor_t) An anchor that represents horizontal and vertical planes. [`typedef NSObject * ar_plane_anchors_t;`](/documentation/ARKit/ar_plane_anchors_t) A collection of plane anchors. [`typedef _Bool (^)(NSObject *) ar_plane_anchors_enumerator_t;`](/documentation/ARKit/ar_plane_anchors_enumerator_t) A handler for enumerating a collection of plane anchors. [`typedef NSObject * ar_plane_detection_provider_t;`](/documentation/ARKit/ar_plane_detection_provider_t) A source of live data about planes in a person’s surroundings. [`typedef enum { ... } ar_hand_skeleton_joint_name_t;`](/documentation/ARKit/ar_hand_skeleton_joint_name_t) An enumeration that describes hand joint names. [`typedef enum { ... } ar_hand_anchor_query_status_t;`](/documentation/ARKit/ar_hand_anchor_query_status_t) An enumeration that describes the status of a hand anchor query. ### Data providers [`typedef enum { ... } ar_data_provider_state_t;`](/documentation/ARKit/ar_data_provider_state_t) The possible states of a data provider. [`extern ar_authorization_type_t ar_data_provider_get_required_authorization_type(ar_data_provider_t data_provider);`](/documentation/ARKit/ar_data_provider_get_required_authorization_type) The kinds of authorization you need to use a particular data provider type. [`extern ar_data_provider_state_t ar_data_provider_get_state(ar_data_provider_t data_provider);`](/documentation/ARKit/ar_data_provider_get_state) Gets the current status of data coming from this provider. [`typedef _Bool (^)(NSObject *) ar_data_providers_enumerator_t;`](/documentation/ARKit/ar_data_providers_enumerator_t) A handler for enumerating a collection of data providers. [`typedef NSObject * ar_data_providers_t;`](/documentation/ARKit/ar_data_providers_t) A collection of data providers. [`extern void ar_data_providers_add_data_provider(ar_data_providers_t data_providers, ar_data_provider_t data_provider_to_add);`](/documentation/ARKit/ar_data_providers_add_data_provider) Adds a data provider to a collection. [`extern void ar_data_providers_add_data_providers(ar_data_providers_t data_providers, ar_data_providers_t data_providers_to_add);`](/documentation/ARKit/ar_data_providers_add_data_providers) Adds multiple data providers to a collection. [`extern ar_data_providers_tar_data_providers_create();`](/documentation/ARKit/ar_data_providers_create) Creates an empty collection of data providers. [`extern ar_data_providers_tar_data_providers_create_with_data_providers(ar_data_provider_t data_provider, ...);`](/documentation/ARKit/ar_data_providers_create_with_data_providers) Creates a collection of data providers that contains the data providers you supply. [`extern void ar_data_providers_enumerate_data_providers_f(ar_data_providers_t data_providers, void *context, ar_data_providers_enumerator_function_t data_providers_enumerator_function);`](/documentation/ARKit/ar_data_providers_enumerate_data_providers_f) Enumerates a collection of data providers. [`extern size_t ar_data_providers_get_count(ar_data_providers_t data_providers);`](/documentation/ARKit/ar_data_providers_get_count) Gets the number of data providers in a collection. [`extern void ar_data_providers_enumerate_data_providers(ar_data_providers_t data_providers, ar_data_providers_enumerator_t data_providers_enumerator);`](/documentation/ARKit/ar_data_providers_enumerate_data_providers) Enumerates a collection of data providers. [`extern void ar_data_providers_remove_data_provider(ar_data_providers_t data_providers, ar_data_provider_t data_provider_to_remove);`](/documentation/ARKit/ar_data_providers_remove_data_provider) Removes a data provider from a collection. [`extern void ar_data_providers_remove_data_providers(ar_data_providers_t data_providers, ar_data_providers_t data_providers_to_remove);`](/documentation/ARKit/ar_data_providers_remove_data_providers) Removes multiple data providers from a collection. [`typedef _Bool (*)(void *, NSObject *) ar_data_providers_enumerator_function_t;`](/documentation/ARKit/ar_data_providers_enumerator_function_t) [`typedef void (*)(void *, NSObject *, ar_data_provider_state_t, NSObject *, NSObject *) ar_session_data_provider_state_change_handler_function_t;`](/documentation/ARKit/ar_session_data_provider_state_change_handler_function_t) A handler function that the session calls when one or more data providers associated with it change state. [`typedef NSObject * ar_data_provider_t;`](/documentation/ARKit/ar_data_provider_t) A source of live data from ARKit. ### Geometry [`typedef enum { ... } ar_geometry_primitive_type_t;`](/documentation/ARKit/ar_geometry_primitive_type_t) The kinds of geometry primitives that a geometry element can contain. [`extern idar_geometry_element_get_buffer(ar_geometry_element_t geometry_element);`](/documentation/ARKit/ar_geometry_element_get_buffer) Gets a Metal buffer that contains index data that defines the geometry of an object. [`extern size_t ar_geometry_element_get_bytes_per_index(ar_geometry_element_t geometry_element);`](/documentation/ARKit/ar_geometry_element_get_bytes_per_index) Gets the number of bytes that represent an index value. [`extern size_t ar_geometry_element_get_count(ar_geometry_element_t geometry_element);`](/documentation/ARKit/ar_geometry_element_get_count) Gets the number of primitives in the Metal buffer for a geometry element. [`extern size_t ar_geometry_element_get_index_count_per_primitive(ar_geometry_element_t geometry_element);`](/documentation/ARKit/ar_geometry_element_get_index_count_per_primitive) Gets the number of indices for each primitive. [`extern ar_geometry_primitive_type_t ar_geometry_element_get_primitive_type(ar_geometry_element_t geometry_element);`](/documentation/ARKit/ar_geometry_element_get_primitive_type) Gets the kind of primitive, lines or triangles, that a geometry element contains. [`extern idar_geometry_source_get_buffer(ar_geometry_source_t geometry_source);`](/documentation/ARKit/ar_geometry_source_get_buffer) Gets a Metal buffer that contains per-vector data for a geometry source. [`extern size_t ar_geometry_source_get_components_per_vector(ar_geometry_source_t geometry_source);`](/documentation/ARKit/ar_geometry_source_get_components_per_vector) Gets the number of scalar components in each vector in a geometry source. [`extern size_t ar_geometry_source_get_count(ar_geometry_source_t geometry_source);`](/documentation/ARKit/ar_geometry_source_get_count) Gets the number of vectors in a geometry source. [`extern MTLVertexFormat ar_geometry_source_get_format(ar_geometry_source_t geometry_source);`](/documentation/ARKit/ar_geometry_source_get_format) Gets the vertex format for data in a geometry source’s buffer. [`extern size_t ar_geometry_source_get_offset(ar_geometry_source_t geometry_source);`](/documentation/ARKit/ar_geometry_source_get_offset) Gets the offset, in bytes, from the beginning of a geometry source’s buffer. [`extern size_t ar_geometry_source_get_stride(ar_geometry_source_t geometry_source);`](/documentation/ARKit/ar_geometry_source_get_stride) Gets the number of bytes between one vector and another in a geometry source’s buffer. [`ar_geometry_primitive_type_line`](/documentation/ARKit/ar_geometry_primitive_type_t/ar_geometry_primitive_type_line) Two vertices that connect to form a line. [`ar_geometry_primitive_type_triangle`](/documentation/ARKit/ar_geometry_primitive_type_t/ar_geometry_primitive_type_triangle) Three vertices that connect to form a triangle. [`typedef NSObject * ar_geometry_element_t;`](/documentation/ARKit/ar_geometry_element_t) A container for vertex indices of lines or triangles. [`typedef NSObject * ar_geometry_source_t;`](/documentation/ARKit/ar_geometry_source_t) A container for geometrical vector data. [`typedef NSObject * ar_mesh_geometry_t;`](/documentation/ARKit/ar_mesh_geometry_t) The shapes that make up a mesh anchor. [`typedef _Bool (*)(void *, NSObject *) ar_mesh_anchors_enumerator_function_t;`](/documentation/ARKit/ar_mesh_anchors_enumerator_function_t) ### Plane detection [`typedef enum { ... } ar_plane_alignment_t;`](/documentation/ARKit/ar_plane_alignment_t) The kinds of alignment — horizontal or vertical — that a plane anchor can have. [`typedef enum { ... } ar_plane_classification_t;`](/documentation/ARKit/ar_plane_classification_t) The kinds of object classification a plane anchor can have. [`ar_plane_classification_ceiling`](/documentation/ARKit/ar_plane_classification_t/ar_plane_classification_ceiling) A ceiling. [`ar_plane_classification_door`](/documentation/ARKit/ar_plane_classification_t/ar_plane_classification_door) A door. [`ar_plane_classification_floor`](/documentation/ARKit/ar_plane_classification_t/ar_plane_classification_floor) A floor. [`ar_plane_classification_seat`](/documentation/ARKit/ar_plane_classification_t/ar_plane_classification_seat) A seat. [`ar_plane_classification_status_not_available`](/documentation/ARKit/ar_plane_classification_t/ar_plane_classification_status_not_available) A plane classification is currently unavailable. [`ar_plane_classification_status_undetermined`](/documentation/ARKit/ar_plane_classification_t/ar_plane_classification_status_undetermined) A plane classification is undetermined. [`ar_plane_classification_status_unknown`](/documentation/ARKit/ar_plane_classification_t/ar_plane_classification_status_unknown) A plane classification isn’t one of the known classes. [`ar_plane_classification_table`](/documentation/ARKit/ar_plane_classification_t/ar_plane_classification_table) A table. [`ar_plane_classification_wall`](/documentation/ARKit/ar_plane_classification_t/ar_plane_classification_wall) A wall. [`ar_plane_classification_window`](/documentation/ARKit/ar_plane_classification_t/ar_plane_classification_window) A window. [`extern ar_plane_alignment_t ar_plane_anchor_get_alignment(ar_plane_anchor_t plane_anchor);`](/documentation/ARKit/ar_plane_anchor_get_alignment) Gets the alignment — horizontal or vertical — of a plane anchor relative to gravity. [`extern ar_plane_geometry_tar_plane_anchor_get_geometry(ar_plane_anchor_t plane_anchor);`](/documentation/ARKit/ar_plane_anchor_get_geometry) Gets the shape of a plane anchor. [`extern ar_plane_classification_t ar_plane_anchor_get_plane_classification(ar_plane_anchor_t plane_anchor);`](/documentation/ARKit/ar_plane_anchor_get_plane_classification) Gets the kind of real-world object that ARKit determines the plane anchor might be. [`extern void ar_plane_anchors_enumerate_anchors(ar_plane_anchors_t plane_anchors, ar_plane_anchors_enumerator_t plane_anchors_enumerator);`](/documentation/ARKit/ar_plane_anchors_enumerate_anchors) Enumerates a collection of plane anchors using the collection of plane anchors and the enumeratin handler you provide. [`extern void ar_plane_anchors_enumerate_anchors_f(ar_plane_anchors_t plane_anchors, void *context, ar_plane_anchors_enumerator_function_t plane_anchors_enumerator_function);`](/documentation/ARKit/ar_plane_anchors_enumerate_anchors_f) Enumerates a collection of plane anchors. [`extern size_t ar_plane_anchors_get_count(ar_plane_anchors_t plane_anchors);`](/documentation/ARKit/ar_plane_anchors_get_count) Gets the number of plane anchors in a collection. [`extern ar_surface_classification_t ar_plane_anchor_get_surface_classification(ar_plane_anchor_t plane_anchor);`](/documentation/ARKit/ar_plane_anchor_get_surface_classification) Get the surface classification of a plane anchor. [`typedef NSObject * ar_plane_detection_configuration_t;`](/documentation/ARKit/ar_plane_detection_configuration_t) [`extern ar_plane_detection_provider_tar_plane_detection_provider_create(ar_plane_detection_configuration_t plane_detection_configuration);`](/documentation/ARKit/ar_plane_detection_provider_create) Creates a plane detection provider for the types of planes you want to detect. [`extern bool ar_plane_detection_provider_is_supported();`](/documentation/ARKit/ar_plane_detection_provider_is_supported) Returns a Boolean value that indicates whether the current runtime environment supports plane detection providers. [`extern ar_plane_extent_tar_plane_geometry_get_plane_extent(ar_plane_geometry_t plane_geometry);`](/documentation/ARKit/ar_plane_geometry_get_plane_extent) Gets the size of a plane. [`extern ar_geometry_source_tar_plane_geometry_get_mesh_vertices(ar_plane_geometry_t plane_geometry);`](/documentation/ARKit/ar_plane_geometry_get_mesh_vertices) Gets the vertices in the mesh that describes a plane. [`extern ar_geometry_element_tar_plane_geometry_get_mesh_faces(ar_plane_geometry_t plane_geometry);`](/documentation/ARKit/ar_plane_geometry_get_mesh_faces) Gets the faces in the mesh that describes a plane. [`extern ar_authorization_type_t ar_plane_detection_provider_get_required_authorization_type();`](/documentation/ARKit/ar_plane_detection_provider_get_required_authorization_type) Gets the types of authorizations necessary for detecting planes. [`extern ar_plane_detection_configuration_tar_plane_detection_configuration_create();`](/documentation/ARKit/ar_plane_detection_configuration_create) Creates a plane detection configuration. [`extern void ar_plane_detection_configuration_set_alignment(ar_plane_detection_configuration_t plane_detection_configuration, ar_plane_alignment_t alignment);`](/documentation/ARKit/ar_plane_detection_configuration_set_alignment) Sets the plane alignments that you want the provider to detect. [`extern void ar_plane_detection_provider_set_update_handler(ar_plane_detection_provider_t plane_detection_provider, dispatch_queue_t plane_detection_updates_queue, ar_plane_detection_update_handler_t plane_detection_update_handler);`](/documentation/ARKit/ar_plane_detection_provider_set_update_handler) Sets the handler for receiving plane detection updates. [`extern void ar_plane_detection_provider_set_update_handler_f(ar_plane_detection_provider_t plane_detection_provider, dispatch_queue_t plane_detection_updates_queue, void *context, ar_plane_detection_update_handler_function_t plane_detection_update_handler_function);`](/documentation/ARKit/ar_plane_detection_provider_set_update_handler_f) Sets the handler for receiving plane detection updates using the plane detection provider and plane detection update queue you provide. [`typedef NSObject * ar_plane_extent_t;`](/documentation/ARKit/ar_plane_extent_t) The size of a plane. [`extern float ar_plane_extent_get_height(ar_plane_extent_t plane_extent);`](/documentation/ARKit/ar_plane_extent_get_height) Gets the height of a plane. [`extern simd_float4x4 ar_plane_extent_get_plane_anchor_from_plane_extent_transform(ar_plane_extent_t plane_extent);`](/documentation/ARKit/ar_plane_extent_get_plane_anchor_from_plane_extent_transform) Gets the transform of a plane anchor from its extent transform. [`extern float ar_plane_extent_get_width(ar_plane_extent_t plane_extent);`](/documentation/ARKit/ar_plane_extent_get_width) Gets the width of a plane. [`typedef NSObject * ar_plane_geometry_t;`](/documentation/ARKit/ar_plane_geometry_t) The geometry of a plane anchor. [`typedef void (^)(NSObject *, NSObject *, NSObject *) ar_plane_detection_update_handler_t;`](/documentation/ARKit/ar_plane_detection_update_handler_t) A handler for receiving updates to plane anchors. [`typedef _Bool (*)(void *, NSObject *) ar_plane_anchors_enumerator_function_t;`](/documentation/ARKit/ar_plane_anchors_enumerator_function_t) [`typedef void (*)(void *, NSObject *, NSObject *, NSObject *) ar_plane_detection_update_handler_function_t;`](/documentation/ARKit/ar_plane_detection_update_handler_function_t) [`enum ARPlaneClassificationStatus : NSInteger;`](/documentation/ARKit/ARPlaneClassificationStatus) Possible states of ARKit’s process for classifying plane anchors. [`typedef enum { ... } ar_surface_classification_t;`](/documentation/ARKit/ar_surface_classification_t) A value describing the classification of a surface. ### World tracking [`extern ar_world_anchor_tar_world_anchor_create_with_origin_from_anchor_transform(simd_float4x4 origin_from_anchor_transform);`](/documentation/ARKit/ar_world_anchor_create_with_origin_from_anchor_transform) Creates a world anchor from a position and orientation in world space. [`extern bool ar_world_anchor_is_shared_with_nearby_participants(ar_world_anchor_t world_anchor);`](/documentation/ARKit/ar_world_anchor_is_shared_with_nearby_participants) Check if a world anchor is marked to be shared with nearby participants. [`extern ar_world_anchor_tar_world_anchor_shared_with_nearby_participants_create(simd_float4x4 origin_from_anchor_transform);`](/documentation/ARKit/ar_world_anchor_shared_with_nearby_participants_create) Initialize a world anchor that should be shared with nearby participants. [`typedef void (*)(void *, ar_world_anchor_sharing_availability_t) ar_world_anchor_sharing_availability_update_handler_function_t;`](/documentation/ARKit/ar_world_anchor_sharing_availability_update_handler_function_t) Function pointer called when there is a change in world anchor sharing availability. [`typedef void (^)(ar_world_anchor_sharing_availability_t) ar_world_anchor_sharing_availability_update_handler_t;`](/documentation/ARKit/ar_world_anchor_sharing_availability_update_handler_t) A handler that the provider calls when there is a change in world anchor sharing availability. [`typedef void (^)(NSObject *, _Bool, NSObject *) ar_world_tracking_add_anchor_completion_handler_t;`](/documentation/ARKit/ar_world_tracking_add_anchor_completion_handler_t) A handler to call upon completion of a request to add a world anchor. [`typedef void (^)(NSObject *, _Bool, NSObject *) ar_world_tracking_remove_anchor_completion_handler_t;`](/documentation/ARKit/ar_world_tracking_remove_anchor_completion_handler_t) A handler to call upon completion of a request to remove a world anchor. [`typedef void (^)(void *, _Bool, NSObject *) ar_world_tracking_remove_all_anchors_completion_handler_function_t;`](/documentation/ARKit/ar_world_tracking_remove_all_anchors_completion_handler_function_t) Function called when a request to remove all known world anchors has completed (successfully or not). [`typedef void (^)(_Bool, NSObject *) ar_world_tracking_remove_all_anchors_completion_handler_t;`](/documentation/ARKit/ar_world_tracking_remove_all_anchors_completion_handler_t) Function called when a request to remove all known world anchors has completed (successfully or not). [`typedef void (^)(NSObject *, NSObject *, NSObject *) ar_world_tracking_anchor_update_handler_t;`](/documentation/ARKit/ar_world_tracking_anchor_update_handler_t) A handler for receiving updates to world anchors. [`extern ar_world_tracking_configuration_tar_world_tracking_configuration_create();`](/documentation/ARKit/ar_world_tracking_configuration_create) Creates a world tracking configuration. [`extern void ar_world_anchors_enumerate_anchors(ar_world_anchors_t world_anchors, ar_world_anchors_enumerator_t world_anchors_enumerator);`](/documentation/ARKit/ar_world_anchors_enumerate_anchors) Enumerates a collection of world anchors. [`extern void ar_world_anchors_enumerate_anchors_f(ar_world_anchors_t world_anchors, void *context, ar_world_anchors_enumerator_function_t world_anchors_enumerator_function);`](/documentation/ARKit/ar_world_anchors_enumerate_anchors_f) Enumerates a collection of world anchors. [`extern size_t ar_world_anchors_get_count(ar_world_anchors_t world_anchors);`](/documentation/ARKit/ar_world_anchors_get_count) Gets the number of world anchors in the collection. [`extern ar_world_tracking_provider_tar_world_tracking_provider_create(ar_world_tracking_configuration_t world_tracking_configuration);`](/documentation/ARKit/ar_world_tracking_provider_create) Creates a world tracking provider. [`extern bool ar_world_tracking_provider_is_supported();`](/documentation/ARKit/ar_world_tracking_provider_is_supported) Returns a Boolean value that indicates whether the current runtime environment supports world tracking providers. [`extern ar_device_anchor_query_status_t ar_world_tracking_provider_query_device_anchor_at_timestamp(ar_world_tracking_provider_t world_tracking_provider, CFTimeInterval timestamp, ar_device_anchor_t device_anchor);`](/documentation/ARKit/ar_world_tracking_provider_query_device_anchor_at_timestamp) Queries the predicted pose of the current device at a given time. [`extern void ar_world_tracking_provider_add_anchor(ar_world_tracking_provider_t world_tracking_provider, ar_world_anchor_t world_anchor, ar_world_tracking_add_anchor_completion_handler_t add_anchor_completion_handler);`](/documentation/ARKit/ar_world_tracking_provider_add_anchor) Adds a world anchor you supply to the set of currently tracked anchors. [`extern void ar_world_tracking_provider_add_anchor_f(ar_world_tracking_provider_t world_tracking_provider, ar_world_anchor_t world_anchor, void *context, ar_world_tracking_add_anchor_completion_handler_function_t add_anchor_completion_handler_function);`](/documentation/ARKit/ar_world_tracking_provider_add_anchor_f) Adds a world anchor you supply to the set of currently tracked anchors. [`extern ar_authorization_type_t ar_world_tracking_provider_get_required_authorization_type();`](/documentation/ARKit/ar_world_tracking_provider_get_required_authorization_type) Gets the types of authorizations required to track world anchors. [`extern void ar_world_tracking_provider_set_anchor_update_handler(ar_world_tracking_provider_t world_tracking_provider, dispatch_queue_t world_tracking_updates_queue, ar_world_tracking_anchor_update_handler_t world_tracking_anchor_update_handler);`](/documentation/ARKit/ar_world_tracking_provider_set_anchor_update_handler) Sets the handler for receiving world tracking updates. [`extern void ar_world_tracking_provider_set_anchor_update_handler_f(ar_world_tracking_provider_t world_tracking_provider, dispatch_queue_t world_tracking_updates_queue, void *context, ar_world_tracking_anchor_update_handler_function_t world_tracking_anchor_update_handler_function);`](/documentation/ARKit/ar_world_tracking_provider_set_anchor_update_handler_f) Sets the handler for receiving world tracking updates. [`extern void ar_world_tracking_provider_remove_anchor_with_identifier(ar_world_tracking_provider_t world_tracking_provider, uuid_t anchor_identifier, ar_world_tracking_remove_anchor_completion_handler_t remove_anchor_completion_handler);`](/documentation/ARKit/ar_world_tracking_provider_remove_anchor_with_identifier) Removes a world anchor from a world tracking provider based on its ID. [`extern void ar_world_tracking_provider_remove_anchor(ar_world_tracking_provider_t world_tracking_provider, ar_world_anchor_t world_anchor, ar_world_tracking_remove_anchor_completion_handler_t remove_anchor_completion_handler);`](/documentation/ARKit/ar_world_tracking_provider_remove_anchor) Removes a world anchor from a world tracking provider. [`extern void ar_world_tracking_provider_remove_anchor_f(ar_world_tracking_provider_t world_tracking_provider, ar_world_anchor_t world_anchor, void *context, ar_world_tracking_remove_anchor_completion_handler_function_t remove_anchor_completion_handler_function);`](/documentation/ARKit/ar_world_tracking_provider_remove_anchor_f) Removes a world anchor from a world tracking provider. [`extern void ar_world_tracking_provider_remove_all_anchors(ar_world_tracking_provider_t world_tracking_provider, ar_world_tracking_remove_all_anchors_completion_handler_t remove_all_anchors_completion_handler);`](/documentation/ARKit/ar_world_tracking_provider_remove_all_anchors) Removes all known world anchors from the world tracking provider asynchronously. [`extern void ar_world_tracking_provider_remove_all_anchors_f(ar_world_tracking_provider_t world_tracking_provider, void *context, ar_world_tracking_remove_all_anchors_completion_handler_function_t remove_all_anchors_completion_handler_function);`](/documentation/ARKit/ar_world_tracking_provider_remove_all_anchors_f) Removes all known world anchors from the world tracking provider asynchronously. [`extern void ar_world_tracking_provider_remove_anchor_with_identifier_f(ar_world_tracking_provider_t world_tracking_provider, uuid_t anchor_identifier, void *context, ar_world_tracking_remove_anchor_completion_handler_function_t remove_anchor_completion_handler_function);`](/documentation/ARKit/ar_world_tracking_provider_remove_anchor_with_identifier_f) Remove a world anchor from the world tracking provider using its identifier. [`extern void ar_world_tracking_provider_set_world_anchor_sharing_availability_update_handler(ar_world_tracking_provider_t world_tracking_provider, dispatch_queue_t world_tracking_updates_queue, ar_world_anchor_sharing_availability_update_handler_t world_anchor_sharing_availability_update_handler);`](/documentation/ARKit/ar_world_tracking_provider_set_world_anchor_sharing_availability_update_handler) Set the handler for receiving world anchor sharing availability updates. [`extern void ar_world_tracking_provider_set_world_anchor_sharing_availability_update_handler_f(ar_world_tracking_provider_t world_tracking_provider, dispatch_queue_t world_tracking_updates_queue, void *context, ar_world_anchor_sharing_availability_update_handler_function_t world_anchor_sharing_availability_update_handler_function);`](/documentation/ARKit/ar_world_tracking_provider_set_world_anchor_sharing_availability_update_handler_f) Set the function for receiving world anchor sharing availability updates [`typedef NSObject * ar_world_tracking_configuration_t;`](/documentation/ARKit/ar_world_tracking_configuration_t) [`typedef NSObject * ar_device_anchor_t;`](/documentation/ARKit/ar_device_anchor_t) [`extern ar_device_anchor_tar_device_anchor_create();`](/documentation/ARKit/ar_device_anchor_create) [`typedef enum { ... } ar_device_anchor_query_status_t;`](/documentation/ARKit/ar_device_anchor_query_status_t) [`typedef _Bool (*)(void *, NSObject *) ar_world_anchors_enumerator_function_t;`](/documentation/ARKit/ar_world_anchors_enumerator_function_t) [`typedef void (*)(void *, NSObject *, _Bool, NSObject *) ar_world_tracking_add_anchor_completion_handler_function_t;`](/documentation/ARKit/ar_world_tracking_add_anchor_completion_handler_function_t) [`typedef void (*)(void *, NSObject *, NSObject *, NSObject *) ar_world_tracking_anchor_update_handler_function_t;`](/documentation/ARKit/ar_world_tracking_anchor_update_handler_function_t) [`typedef void (*)(void *, NSObject *, _Bool, NSObject *) ar_world_tracking_remove_anchor_completion_handler_function_t;`](/documentation/ARKit/ar_world_tracking_remove_anchor_completion_handler_function_t) [`typedef NSObject * ar_world_tracking_provider_t;`](/documentation/ARKit/ar_world_tracking_provider_t) A source of live data about the device pose and anchors in a person’s surroundings. [`extern simd_float4x4 ar_world_anchor_get_origin_from_anchor_transform_with_correction(ar_world_anchor_t anchor, ar_transform_correction_t transform_correction);`](/documentation/ARKit/ar_world_anchor_get_origin_from_anchor_transform_with_correction) Get the transform from an anchor to the origin coordinate system. [`typedef enum { ... } ar_camera_position_t;`](/documentation/ARKit/ar_camera_position_t) An enumeration that describes possible camera positions. [`typedef enum { ... } ar_camera_type_t;`](/documentation/ARKit/ar_camera_type_t) An enumeration that describes camera types. [`typedef enum { ... } ar_device_anchor_tracking_state_t;`](/documentation/ARKit/ar_device_anchor_tracking_state_t) Values that describe the tracking states of a device anchor. [`typedef enum { ... } ar_world_tracking_error_code_t;`](/documentation/ARKit/ar_world_tracking_error_code_t) The error codes for errors that world tracking providers throw. [`typedef enum { ... } ar_session_error_code_t;`](/documentation/ARKit/ar_session_error_code_t) The error codes for ARKit sessions. ### Scene reconstruction [`typedef NSObject * ar_scene_reconstruction_configuration_t;`](/documentation/ARKit/ar_scene_reconstruction_configuration_t) [`typedef enum { ... } ar_scene_reconstruction_mode_t;`](/documentation/ARKit/ar_scene_reconstruction_mode_t) The additional kinds of information you can request about a person’s surroundings. [`extern ar_scene_reconstruction_provider_tar_scene_reconstruction_provider_create(ar_scene_reconstruction_configuration_t scene_reconstruction_configuration);`](/documentation/ARKit/ar_scene_reconstruction_provider_create) Creates a provider that reconstructs the person’s surroundings. [`extern bool ar_scene_reconstruction_provider_is_supported();`](/documentation/ARKit/ar_scene_reconstruction_provider_is_supported) Returns a Boolean value that indicates whether the current runtime environment supports scene reconstruction providers. [`extern ar_authorization_type_t ar_scene_reconstruction_provider_get_required_authorization_type();`](/documentation/ARKit/ar_scene_reconstruction_provider_get_required_authorization_type) Gets the types of authorizations needed to run scene reconstruction. [`extern ar_scene_reconstruction_configuration_tar_scene_reconstruction_configuration_create();`](/documentation/ARKit/ar_scene_reconstruction_configuration_create) Creates a scene reconstruction configuration. [`extern ar_scene_reconstruction_mode_t ar_scene_reconstruction_configuration_get_scene_reconstruction_mode(ar_scene_reconstruction_configuration_t scene_reconstruction_configuration);`](/documentation/ARKit/ar_scene_reconstruction_configuration_get_scene_reconstruction_mode) Gets the scene reconstruction mode. [`extern void ar_scene_reconstruction_configuration_set_scene_reconstruction_mode(ar_scene_reconstruction_configuration_t scene_reconstruction_configuration, ar_scene_reconstruction_mode_t scene_reconstruction_mode);`](/documentation/ARKit/ar_scene_reconstruction_configuration_set_scene_reconstruction_mode) Sets the scene reconstruction mode. [`extern void ar_scene_reconstruction_provider_set_update_handler(ar_scene_reconstruction_provider_t scene_reconstruction_provider, dispatch_queue_t scene_reconstruction_updates_queue, ar_scene_reconstruction_update_handler_t scene_reconstruction_update_handler);`](/documentation/ARKit/ar_scene_reconstruction_provider_set_update_handler) Sets the handler for receiving scene reconstruction updates. [`extern void ar_scene_reconstruction_provider_set_update_handler_f(ar_scene_reconstruction_provider_t scene_reconstruction_provider, dispatch_queue_t scene_reconstruction_updates_queue, void *context, ar_scene_reconstruction_update_handler_function_t scene_reconstruction_update_handler_function);`](/documentation/ARKit/ar_scene_reconstruction_provider_set_update_handler_f) Sets the handler for receiving scene reconstruction updates. [`typedef enum { ... } ar_mesh_classification_t;`](/documentation/ARKit/ar_mesh_classification_t) The kinds of classification a mesh anchor can have. [`extern ar_mesh_geometry_tar_mesh_anchor_get_geometry(ar_mesh_anchor_t mesh_anchor);`](/documentation/ARKit/ar_mesh_anchor_get_geometry) Gets the shape of a mesh anchor. [`extern void ar_mesh_anchors_enumerate_anchors(ar_mesh_anchors_t mesh_anchors, ar_mesh_anchors_enumerator_t mesh_anchors_enumerator);`](/documentation/ARKit/ar_mesh_anchors_enumerate_anchors) Enumerates a collection of mesh anchors. [`extern void ar_mesh_anchors_enumerate_anchors_f(ar_mesh_anchors_t mesh_anchors, void *context, ar_mesh_anchors_enumerator_function_t mesh_anchors_enumerator_function);`](/documentation/ARKit/ar_mesh_anchors_enumerate_anchors_f) Enumerates a collection of mesh anchors. [`extern size_t ar_mesh_anchors_get_count(ar_mesh_anchors_t mesh_anchors);`](/documentation/ARKit/ar_mesh_anchors_get_count) Gets the number of mesh anchors in the collection. [`extern simd_float4x4 ar_mesh_anchor_get_origin_from_anchor_transform_with_correction(ar_mesh_anchor_t anchor, ar_transform_correction_t transform_correction);`](/documentation/ARKit/ar_mesh_anchor_get_origin_from_anchor_transform_with_correction) Get the transform from an anchor to the origin coordinate system. [`extern ar_geometry_source_tar_mesh_geometry_get_classification(ar_mesh_geometry_t mesh_geometry);`](/documentation/ARKit/ar_mesh_geometry_get_classification) Gets the classification of each face in the mesh. [`extern ar_geometry_element_tar_mesh_geometry_get_faces(ar_mesh_geometry_t mesh_geometry);`](/documentation/ARKit/ar_mesh_geometry_get_faces) Gets the faces of the mesh. [`extern ar_geometry_source_tar_mesh_geometry_get_normals(ar_mesh_geometry_t mesh_geometry);`](/documentation/ARKit/ar_mesh_geometry_get_normals) Gets the normals of the mesh. [`extern ar_geometry_source_tar_mesh_geometry_get_vertices(ar_mesh_geometry_t mesh_geometry);`](/documentation/ARKit/ar_mesh_geometry_get_vertices) Gets the vertices of the mesh. [`typedef NSObject * ar_scene_reconstruction_provider_t;`](/documentation/ARKit/ar_scene_reconstruction_provider_t) A source of live data about the shape of a person’s surroundings. [`typedef void (^)(NSObject *, NSObject *, NSObject *) ar_scene_reconstruction_update_handler_t;`](/documentation/ARKit/ar_scene_reconstruction_update_handler_t) A handler for receiving updates to mesh anchors. [`typedef void (*)(void *, NSObject *, NSObject *, NSObject *) ar_scene_reconstruction_update_handler_function_t;`](/documentation/ARKit/ar_scene_reconstruction_update_handler_function_t) ### Hand tracking [`typedef enum { ... } ar_hand_chirality_t;`](/documentation/ARKit/ar_hand_chirality_t) The values identifying hand chirality. [`extern ar_hand_anchor_tar_hand_anchor_create();`](/documentation/ARKit/ar_hand_anchor_create) Creates a hand anchor. [`extern ar_hand_chirality_t ar_hand_anchor_get_chirality(ar_hand_anchor_t hand_anchor);`](/documentation/ARKit/ar_hand_anchor_get_chirality) Gets the value that indicates whether the hand is a left or right hand. [`extern ar_hand_fidelity_t ar_hand_anchor_get_fidelity(ar_hand_anchor_t hand_anchor);`](/documentation/ARKit/ar_hand_anchor_get_fidelity) Get the fidelity of the hand anchor. [`extern simd_float4x4 ar_hand_anchor_get_origin_from_anchor_transform_with_correction(ar_hand_anchor_t hand_anchor, ar_transform_correction_t transform_correction);`](/documentation/ARKit/ar_hand_anchor_get_origin_from_anchor_transform_with_correction) Get the transform from an anchor to the origin coordinate system. [`typedef NSObject * ar_hand_tracking_configuration_t;`](/documentation/ARKit/ar_hand_tracking_configuration_t) [`extern ar_hand_tracking_provider_tar_hand_tracking_provider_create(ar_hand_tracking_configuration_t hand_tracking_configuration);`](/documentation/ARKit/ar_hand_tracking_provider_create) A source of live data about the position of a person’s hands and hand joints. [`extern bool ar_hand_tracking_provider_is_supported();`](/documentation/ARKit/ar_hand_tracking_provider_is_supported) Returns a Boolean value that indicates whether the current runtime environment supports hand tracking providers. [`extern bool ar_hand_tracking_provider_get_latest_anchors(ar_hand_tracking_provider_t hand_tracking_provider, ar_hand_anchor_t hand_anchor_left, ar_hand_anchor_t hand_anchor_right);`](/documentation/ARKit/ar_hand_tracking_provider_get_latest_anchors) Fetches the most recent hand anchors for each hand. [`extern ar_authorization_type_t ar_hand_tracking_provider_get_required_authorization_type();`](/documentation/ARKit/ar_hand_tracking_provider_get_required_authorization_type) Gets the types of authorizations required to track hands. [`extern ar_hand_tracking_configuration_tar_hand_tracking_configuration_create();`](/documentation/ARKit/ar_hand_tracking_configuration_create) [`extern void ar_hand_tracking_provider_set_update_handler(ar_hand_tracking_provider_t hand_tracking_provider, dispatch_queue_t hand_anchor_updates_queue, ar_hand_tracking_update_handler_t hand_tracking_update_handler);`](/documentation/ARKit/ar_hand_tracking_provider_set_update_handler) Sets the handler for receiving hand tracking updates. [`extern void ar_hand_tracking_provider_set_update_handler_f(ar_hand_tracking_provider_t hand_tracking_provider, dispatch_queue_t hand_anchor_updates_queue, void *context, ar_hand_tracking_update_handler_function_t hand_tracking_update_handler_function);`](/documentation/ARKit/ar_hand_tracking_provider_set_update_handler_f) Sets the handler for receiving hand tracking updates. [`ar_hand_skeleton_joint_name_forearm_arm`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_forearm_arm) [`ar_hand_skeleton_joint_name_forearm_wrist`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_forearm_wrist) [`ar_hand_skeleton_joint_name_index_finger_intermediate_base`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_index_finger_intermediate_base) [`ar_hand_skeleton_joint_name_index_finger_intermediate_tip`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_index_finger_intermediate_tip) [`ar_hand_skeleton_joint_name_index_finger_knuckle`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_index_finger_knuckle) [`ar_hand_skeleton_joint_name_index_finger_metacarpal`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_index_finger_metacarpal) [`ar_hand_skeleton_joint_name_index_finger_tip`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_index_finger_tip) [`ar_hand_skeleton_joint_name_little_finger_intermediate_base`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_little_finger_intermediate_base) [`ar_hand_skeleton_joint_name_little_finger_intermediate_tip`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_little_finger_intermediate_tip) [`ar_hand_skeleton_joint_name_little_finger_knuckle`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_little_finger_knuckle) [`ar_hand_skeleton_joint_name_little_finger_metacarpal`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_little_finger_metacarpal) [`ar_hand_skeleton_joint_name_little_finger_tip`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_little_finger_tip) [`ar_hand_skeleton_joint_name_middle_finger_intermediate_base`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_middle_finger_intermediate_base) [`ar_hand_skeleton_joint_name_middle_finger_intermediate_tip`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_middle_finger_intermediate_tip) [`ar_hand_skeleton_joint_name_middle_finger_knuckle`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_middle_finger_knuckle) [`ar_hand_skeleton_joint_name_middle_finger_metacarpal`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_middle_finger_metacarpal) [`ar_hand_skeleton_joint_name_middle_finger_tip`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_middle_finger_tip) [`ar_hand_skeleton_joint_name_ring_finger_intermediate_base`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_ring_finger_intermediate_base) [`ar_hand_skeleton_joint_name_ring_finger_intermediate_tip`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_ring_finger_intermediate_tip) [`ar_hand_skeleton_joint_name_ring_finger_knuckle`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_ring_finger_knuckle) [`ar_hand_skeleton_joint_name_ring_finger_metacarpal`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_ring_finger_metacarpal) [`ar_hand_skeleton_joint_name_ring_finger_tip`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_ring_finger_tip) [`ar_hand_skeleton_joint_name_thumb_intermediate_base`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_thumb_intermediate_base) [`ar_hand_skeleton_joint_name_thumb_intermediate_tip`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_thumb_intermediate_tip) [`ar_hand_skeleton_joint_name_thumb_knuckle`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_thumb_knuckle) [`ar_hand_skeleton_joint_name_thumb_tip`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_thumb_tip) [`ar_hand_skeleton_joint_name_wrist`](/documentation/ARKit/ar_hand_skeleton_joint_name_t/ar_hand_skeleton_joint_name_wrist) [`ar_hand_chirality_left`](/documentation/ARKit/ar_hand_chirality_t/ar_hand_chirality_left) A left hand. [`ar_hand_chirality_right`](/documentation/ARKit/ar_hand_chirality_t/ar_hand_chirality_right) A right hand. [`typedef NSObject * ar_hand_tracking_provider_t;`](/documentation/ARKit/ar_hand_tracking_provider_t) A source of live data about the position of a person’s hands and hand joints. [`typedef void (^)(NSObject *, NSObject *) ar_hand_tracking_update_handler_t;`](/documentation/ARKit/ar_hand_tracking_update_handler_t) A handler for receiving updates to hand anchors. [`typedef void (*)(void *, NSObject *, NSObject *) ar_hand_tracking_update_handler_function_t;`](/documentation/ARKit/ar_hand_tracking_update_handler_function_t) [`typedef enum { ... } ar_hand_fidelity_t;`](/documentation/ARKit/ar_hand_fidelity_t) Enum for hand fidelity. ### Image tracking [`extern float ar_image_anchor_get_estimated_scale_factor(ar_image_anchor_t image_anchor);`](/documentation/ARKit/ar_image_anchor_get_estimated_scale_factor) Gets the estimated scale factor between the tracked image’s physical size and the reference image’s size. [`extern ar_reference_image_tar_image_anchor_get_reference_image(ar_image_anchor_t image_anchor);`](/documentation/ARKit/ar_image_anchor_get_reference_image) Gets the reference image that this image anchor tracks. [`extern void ar_image_anchors_enumerate_anchors(ar_image_anchors_t image_anchors, ar_image_anchors_enumerator_t image_anchors_enumerator);`](/documentation/ARKit/ar_image_anchors_enumerate_anchors) Enumerates a collection of image anchors. [`extern void ar_image_anchors_enumerate_anchors_f(ar_image_anchors_t image_anchors, void *context, ar_image_anchors_enumerator_function_t image_anchors_enumerator_function);`](/documentation/ARKit/ar_image_anchors_enumerate_anchors_f) Enumerates a collection of image anchors. [`extern size_t ar_image_anchors_get_count(ar_image_anchors_t image_anchors);`](/documentation/ARKit/ar_image_anchors_get_count) Gets the number of image anchors in the collection. [`extern ar_image_tracking_provider_tar_image_tracking_provider_create(ar_image_tracking_configuration_t image_tracking_configuration);`](/documentation/ARKit/ar_image_tracking_provider_create) Creates an image tracking provider that tracks the reference images you supply. [`extern bool ar_image_tracking_provider_is_supported();`](/documentation/ARKit/ar_image_tracking_provider_is_supported) Returns a Boolean value that indicates whether the current runtime environment supports image tracking providers. [`extern ar_authorization_type_t ar_image_tracking_provider_get_required_authorization_type();`](/documentation/ARKit/ar_image_tracking_provider_get_required_authorization_type) Gets the types of authorizations required to track images. [`extern void ar_image_tracking_provider_set_update_handler(ar_image_tracking_provider_t image_tracking_provider, dispatch_queue_t image_tracking_updates_queue, ar_image_tracking_update_handler_t image_tracking_update_handler);`](/documentation/ARKit/ar_image_tracking_provider_set_update_handler) Sets the handler for receiving image tracking updates. [`extern void ar_image_tracking_provider_set_update_handler_f(ar_image_tracking_provider_t image_tracking_provider, dispatch_queue_t image_tracking_updates_queue, void *context, ar_image_tracking_update_handler_function_t image_tracking_update_handler_function);`](/documentation/ARKit/ar_image_tracking_provider_set_update_handler_f) Sets the handler for receiving image tracking updates. [`extern void ar_image_tracking_configuration_add_reference_images(ar_image_tracking_configuration_t image_tracking_configuration, ar_reference_images_t reference_images);`](/documentation/ARKit/ar_image_tracking_configuration_add_reference_images) Adds reference images to the set to be tracked. [`extern ar_image_tracking_configuration_tar_image_tracking_configuration_create();`](/documentation/ARKit/ar_image_tracking_configuration_create) Creates an image tracking configuration. [`typedef NSObject * ar_image_tracking_configuration_t;`](/documentation/ARKit/ar_image_tracking_configuration_t) [`extern ar_image_anchors_tar_image_tracking_provider_copy_all_image_anchors(ar_image_tracking_provider_t image_tracking_provider);`](/documentation/ARKit/ar_image_tracking_provider_copy_all_image_anchors) [`typedef NSObject * ar_reference_images_t;`](/documentation/ARKit/ar_reference_images_t) A collection of reference images. [`typedef _Bool (^)(NSObject *) ar_reference_images_enumerator_t;`](/documentation/ARKit/ar_reference_images_enumerator_t) A handler for enumerating a collection of reference images. [`extern void ar_reference_images_add_image(ar_reference_images_t reference_images, ar_reference_image_t image_to_add);`](/documentation/ARKit/ar_reference_images_add_image) Adds a reference image to a collection. [`extern void ar_reference_images_add_images(ar_reference_images_t reference_images, ar_reference_images_t images_to_add);`](/documentation/ARKit/ar_reference_images_add_images) Adds multiple reference images to a collection. [`extern ar_reference_images_tar_reference_images_create();`](/documentation/ARKit/ar_reference_images_create) Creates an empty collection of reference images. [`extern void ar_reference_images_enumerate_images(ar_reference_images_t reference_images, ar_reference_images_enumerator_t reference_images_enumerator);`](/documentation/ARKit/ar_reference_images_enumerate_images) Enumerates a collection of reference images. [`extern void ar_reference_images_enumerate_images_f(ar_reference_images_t reference_images, void *context, ar_reference_images_enumerator_function_t reference_images_enumerator_function);`](/documentation/ARKit/ar_reference_images_enumerate_images_f) Enumerates a collection of reference images. [`extern size_t ar_reference_images_get_count(ar_reference_images_t reference_images);`](/documentation/ARKit/ar_reference_images_get_count) Gets the number of reference images in a collection. [`extern ar_reference_images_tar_reference_images_load_reference_images_in_group(const char *group_name, CFBundleRef bundle);`](/documentation/ARKit/ar_reference_images_load_reference_images_in_group) Creates multiple reference images based on their group name in an asset catalog. [`extern ar_reference_image_tar_reference_image_create_from_cgimage(CGImageRef image, CGImagePropertyOrientation orientation, float physicalWidth);`](/documentation/ARKit/ar_reference_image_create_from_cgimage) Creates a reference image from a Core Graphics image. [`extern ar_reference_image_tar_reference_image_create_from_pixel_buffer(CVPixelBufferRef pixelBuffer, CGImagePropertyOrientation orientation, float physicalWidth);`](/documentation/ARKit/ar_reference_image_create_from_pixel_buffer) Creates a reference image from a pixel buffer. [`extern const char *ar_reference_image_get_name(ar_reference_image_t reference_image);`](/documentation/ARKit/ar_reference_image_get_name) Gets the name of a reference image. [`extern void ar_reference_image_set_name(ar_reference_image_t reference_image, const char *name);`](/documentation/ARKit/ar_reference_image_set_name) Sets the name of a reference image. [`extern float ar_reference_image_get_physical_height(ar_reference_image_t reference_image);`](/documentation/ARKit/ar_reference_image_get_physical_height) Gets the height, in meters, of a reference image in the real world. [`extern float ar_reference_image_get_physical_width(ar_reference_image_t reference_image);`](/documentation/ARKit/ar_reference_image_get_physical_width) Gets the height, in meters, of a reference image in the real world. [`typedef NSObject * ar_image_tracking_provider_t;`](/documentation/ARKit/ar_image_tracking_provider_t) A source of live data about a 2D image’s position in a person’s surroundings. [`typedef void (^)(NSObject *, NSObject *, NSObject *) ar_image_tracking_update_handler_t;`](/documentation/ARKit/ar_image_tracking_update_handler_t) A handler for receiving updates to image anchors. [`typedef NSObject * ar_reference_image_t;`](/documentation/ARKit/ar_reference_image_t) A 2D image the system uses as a reference to find the same image in a person’s surroundings. [`typedef _Bool (*)(void *, NSObject *) ar_image_anchors_enumerator_function_t;`](/documentation/ARKit/ar_image_anchors_enumerator_function_t) [`typedef void (*)(void *, NSObject *, NSObject *, NSObject *) ar_image_tracking_update_handler_function_t;`](/documentation/ARKit/ar_image_tracking_update_handler_function_t) [`typedef _Bool (*)(void *, NSObject *) ar_reference_images_enumerator_function_t;`](/documentation/ARKit/ar_reference_images_enumerator_function_t) [`extern simd_float4x4 ar_image_anchor_get_origin_from_anchor_transform_with_correction(ar_image_anchor_t image_anchor, ar_transform_correction_t transform_correction);`](/documentation/ARKit/ar_image_anchor_get_origin_from_anchor_transform_with_correction) Get the transform from an anchor to the origin coordinate system. ### Accessory tracking [`typedef _Bool (*)(void *, NSObject *) ar_accessories_enumerator_function_t;`](/documentation/ARKit/ar_accessories_enumerator_function_t) Function for enumerating a collection of accessories. [`typedef _Bool (^)(NSObject *) ar_accessories_enumerator_t;`](/documentation/ARKit/ar_accessories_enumerator_t) Handler for enumerating a collection of accessories. [`typedef NSObject * ar_accessories_t;`](/documentation/ARKit/ar_accessories_t) A collection of accessories. [`typedef NSObject * ar_accessory_anchor_t;`](/documentation/ARKit/ar_accessory_anchor_t) An anchor that represents an accessory. [`typedef _Bool (*)(void *, NSObject *) ar_accessory_anchors_enumerator_function_t;`](/documentation/ARKit/ar_accessory_anchors_enumerator_function_t) Function for enumerating a collection of accessory anchors. [`typedef _Bool (^)(NSObject *) ar_accessory_anchors_enumerator_t;`](/documentation/ARKit/ar_accessory_anchors_enumerator_t) Handler for enumerating a collection of accessory anchors. [`typedef NSObject * ar_accessory_anchors_t;`](/documentation/ARKit/ar_accessory_anchors_t) A collection of accessory anchors. [`typedef void (*)(void *, id, _Bool, NSObject *, NSObject *) ar_accessory_device_load_completion_handler_function_t;`](/documentation/ARKit/ar_accessory_device_load_completion_handler_function_t) Function triggered when a request to load an accessory from a `GCDevice` has completed. [`typedef void (^)(id, _Bool, NSObject *, NSObject *) ar_accessory_device_load_completion_handler_t;`](/documentation/ARKit/ar_accessory_device_load_completion_handler_t) Handler triggered when a request to load an accessory from a `GCDevice` has completed. [`typedef NSObject * ar_accessory_t;`](/documentation/ARKit/ar_accessory_t) An accessory that can be tracked in the physical environment, such as a game controller or stylus. [`typedef NSObject * ar_accessory_tracking_configuration_t;`](/documentation/ARKit/ar_accessory_tracking_configuration_t) Configuration for accessory tracking. [`typedef NSObject * ar_accessory_tracking_provider_t;`](/documentation/ARKit/ar_accessory_tracking_provider_t) A data provider for accessory tracking. [`typedef void (*)(void *, NSObject *, NSObject *, NSObject *) ar_accessory_tracking_update_handler_function_t;`](/documentation/ARKit/ar_accessory_tracking_update_handler_function_t) Function called when there are updates to accessory anchors. [`typedef void (^)(NSObject *, NSObject *, NSObject *) ar_accessory_tracking_update_handler_t;`](/documentation/ARKit/ar_accessory_tracking_update_handler_t) Handler called when there are updates to accessory anchors. [`extern const char * const ar_accessory_location_name_aim;`](/documentation/ARKit/ar_accessory_location_name_aim) Pre-defined accessory location name for spatial gamepad and stylus aim point. [`extern const char * const ar_accessory_location_name_grip;`](/documentation/ARKit/ar_accessory_location_name_grip) Pre-defined accessory location name for spatial gamepad grip. [`extern const char * const ar_accessory_location_name_grip_surface;`](/documentation/ARKit/ar_accessory_location_name_grip_surface) Pre-defined accessory location name for spatial gamepad grip surface. [`extern void ar_accessories_add_accessories(ar_accessories_t accessories, ar_accessories_t accessories_to_add);`](/documentation/ARKit/ar_accessories_add_accessories) Add accessories to a collection. [`extern void ar_accessories_add_accessory(ar_accessories_t accessories, ar_accessory_t accessory_to_add);`](/documentation/ARKit/ar_accessories_add_accessory) Add an accessory to a collection. [`extern ar_accessories_tar_accessories_create();`](/documentation/ARKit/ar_accessories_create) Create an empty collection of accessories. [`extern void ar_accessories_enumerate_accessories(ar_accessories_t accessories, ar_accessories_enumerator_t accessories_enumerator);`](/documentation/ARKit/ar_accessories_enumerate_accessories) Enumerate a collection of accessories. [`extern void ar_accessories_enumerate_accessories_f(ar_accessories_t accessories, void *context, ar_accessories_enumerator_function_t accessories_enumerator_function);`](/documentation/ARKit/ar_accessories_enumerate_accessories_f) Enumerate a collection of reference objects. [`extern size_t ar_accessories_get_count(ar_accessories_t accessories);`](/documentation/ARKit/ar_accessories_get_count) Get the count of accessories in the collection. [`extern void ar_accessories_remove_accessory(ar_accessories_t accessories, ar_accessory_t accessory_to_remove);`](/documentation/ARKit/ar_accessories_remove_accessory) Remove an accessory from a collection. [`extern void ar_accessories_remove_accessories(ar_accessories_t accessories, ar_accessories_t accessories_to_remove);`](/documentation/ARKit/ar_accessories_remove_accessories) Remove accessories from a collection. [`extern ar_accessory_anchor_tar_accessory_anchor_create();`](/documentation/ARKit/ar_accessory_anchor_create) Create an uninitialized accessory anchor. [`extern ar_accessory_tar_accessory_anchor_get_accessory(ar_accessory_anchor_t accessory_anchor);`](/documentation/ARKit/ar_accessory_anchor_get_accessory) Returns the accessory that is being tracked by the anchor. [`extern simd_float4x4 ar_accessory_anchor_get_anchor_from_location_transform_with_correction(ar_accessory_anchor_t accessory_anchor, const char *location_name, ar_transform_correction_t transform_correction);`](/documentation/ARKit/ar_accessory_anchor_get_anchor_from_location_transform_with_correction) Get the transform from an anchor to the coordinate system of a location on the accessory. [`extern simd_float3 ar_accessory_anchor_get_angular_velocity(ar_accessory_anchor_t accessory_anchor);`](/documentation/ARKit/ar_accessory_anchor_get_angular_velocity) Get the estimated angular velocity of the accessory in the local coordinate system. [`extern ar_accessory_chirality_t ar_accessory_anchor_get_held_chirality(ar_accessory_anchor_t accessory_anchor);`](/documentation/ARKit/ar_accessory_anchor_get_held_chirality) Get the held state of this accessory anchor. [`extern void ar_accessory_anchor_get_identifier(ar_accessory_anchor_t accessory_anchor, uuid_t out_identifier);`](/documentation/ARKit/ar_accessory_anchor_get_identifier) Get the identifier of an anchor. [`extern simd_float4x4 ar_accessory_anchor_get_origin_from_anchor_transform(ar_accessory_anchor_t accessory_anchor);`](/documentation/ARKit/ar_accessory_anchor_get_origin_from_anchor_transform) Get the transform from an anchor to the origin coordinate system. [`extern simd_float4x4 ar_accessory_anchor_get_origin_from_anchor_transform_with_correction(ar_accessory_anchor_t accessory_anchor, ar_transform_correction_t transform_correction);`](/documentation/ARKit/ar_accessory_anchor_get_origin_from_anchor_transform_with_correction) Get the transform from an anchor to the origin coordinate system. [`extern CFTimeInterval ar_accessory_anchor_get_timestamp(ar_accessory_anchor_t accessory_anchor);`](/documentation/ARKit/ar_accessory_anchor_get_timestamp) Get the timestamp corresponding to the accessory anchor. [`extern ar_accessory_anchor_tracking_state_t ar_accessory_anchor_get_tracking_state(ar_accessory_anchor_t accessory_anchor);`](/documentation/ARKit/ar_accessory_anchor_get_tracking_state) Get the tracking state of the accessory anchor. [`extern simd_float3 ar_accessory_anchor_get_velocity(ar_accessory_anchor_t accessory_anchor);`](/documentation/ARKit/ar_accessory_anchor_get_velocity) Get the estimated velocity of the accessory in the local coordinate system. [`extern bool ar_accessory_anchor_is_equal_to_accessory_anchor(ar_accessory_anchor_t anchor, ar_accessory_anchor_t other_anchor);`](/documentation/ARKit/ar_accessory_anchor_is_equal_to_accessory_anchor) Returns a Boolean value that indicates whether the two accessory anchors are equal. [`extern bool ar_accessory_anchor_is_held(ar_accessory_anchor_t accessory_anchor);`](/documentation/ARKit/ar_accessory_anchor_is_held) Returns a Boolean value that indicates whether the accessory is held. [`extern bool ar_accessory_anchor_is_tracked(ar_accessory_anchor_t accessory_anchor);`](/documentation/ARKit/ar_accessory_anchor_is_tracked) Determine whether an accessory anchor is tracked. [`extern void ar_accessory_anchors_enumerate_anchors(ar_accessory_anchors_t accessory_anchors, ar_accessory_anchors_enumerator_t accessory_anchors_enumerator);`](/documentation/ARKit/ar_accessory_anchors_enumerate_anchors) Enumerate a collection of accessory anchors. [`extern void ar_accessory_anchors_enumerate_anchors_f(ar_accessory_anchors_t accessory_anchors, void *context, ar_accessory_anchors_enumerator_function_t accessory_anchors_enumerator_function);`](/documentation/ARKit/ar_accessory_anchors_enumerate_anchors_f) Enumerate a collection of acessory anchors. [`extern size_t ar_accessory_anchors_get_count(ar_accessory_anchors_t accessory_anchors);`](/documentation/ARKit/ar_accessory_anchors_get_count) Get the count of accessory anchors in the collection. [`extern ar_strings_tar_accessory_copy_location_names(ar_accessory_t accessory);`](/documentation/ARKit/ar_accessory_copy_location_names) Gets the names of locations with pre-defined coordinate systems available for this accessory. [`extern void ar_accessory_get_identifier(ar_accessory_t accessory, uuid_t out_identifier);`](/documentation/ARKit/ar_accessory_get_identifier) Get identifier for the accessory. [`extern ar_accessory_chirality_t ar_accessory_get_inherent_chirality(ar_accessory_t accessory);`](/documentation/ARKit/ar_accessory_get_inherent_chirality) Get inherent chirality for the accessory (what hand it is designed to be held in). [`extern const char *ar_accessory_get_name(ar_accessory_t accessory);`](/documentation/ARKit/ar_accessory_get_name) Get an accessory’s name. [`extern idar_accessory_get_source_device(ar_accessory_t accessory);`](/documentation/ARKit/ar_accessory_get_source_device) Gets the `GCDevice` that was used to initialize the accessory. [`extern ar_accessory_source_type_t ar_accessory_get_source_type(ar_accessory_t accessory);`](/documentation/ARKit/ar_accessory_get_source_type) Gets type of source that was used to load an accessory. [`extern CFURLRefar_accessory_get_usdz_file_path(ar_accessory_t accessory);`](/documentation/ARKit/ar_accessory_get_usdz_file_path) Get path to a USDZ file for the accessory, if it has one. [`extern bool ar_accessory_is_equal_to_accessory(ar_accessory_t accessory, ar_accessory_t other_accessory);`](/documentation/ARKit/ar_accessory_is_equal_to_accessory) Indicates whether two accessories are equal. [`extern void ar_accessory_load_from_device(iddevice, ar_accessory_device_load_completion_handler_t completion_handler);`](/documentation/ARKit/ar_accessory_load_from_device) Load an accessory from a `GCDevice`. [`extern void ar_accessory_load_from_device_f(iddevice, void *context, ar_accessory_device_load_completion_handler_function_t completion_handler_function);`](/documentation/ARKit/ar_accessory_load_from_device_f) Load an accessory from a `GCDevice`. [`extern ar_accessory_tracking_configuration_tar_accessory_tracking_configuration_create();`](/documentation/ARKit/ar_accessory_tracking_configuration_create) Create an accessory tracking configuration. [`extern void ar_accessory_tracking_configuration_set_accessories(ar_accessory_tracking_configuration_t configuration, ar_accessories_t accessories);`](/documentation/ARKit/ar_accessory_tracking_configuration_set_accessories) Set accessories to track for the configuration. [`extern ar_accessory_tracking_provider_tar_accessory_tracking_provider_create(ar_accessory_tracking_configuration_t accessory_tracking_configuration);`](/documentation/ARKit/ar_accessory_tracking_provider_create) Create an accessory tracking provider. [`extern ar_accessory_anchors_tar_accessory_tracking_provider_get_latest_anchors(ar_accessory_tracking_provider_t accessory_tracking_provider);`](/documentation/ARKit/ar_accessory_tracking_provider_get_latest_anchors) Retrieves the latest anchors updated with the most recent inertial data. [`extern ar_authorization_type_t ar_accessory_tracking_provider_get_required_authorization_type();`](/documentation/ARKit/ar_accessory_tracking_provider_get_required_authorization_type) Get the authorization type required by the accessory tracking provider. [`extern bool ar_accessory_tracking_provider_is_supported();`](/documentation/ARKit/ar_accessory_tracking_provider_is_supported) Determines whether this device supports the accessory tracking provider. [`extern bool ar_accessory_tracking_provider_predict_anchor_at_timestamp(ar_accessory_tracking_provider_t accessory_tracking_provider, ar_accessory_anchor_t anchor, CFTimeInterval timestamp, ar_accessory_anchor_t predicted_anchor);`](/documentation/ARKit/ar_accessory_tracking_provider_predict_anchor_at_timestamp) Predict an accessory anchor to a target timestamp. [`extern void ar_accessory_tracking_provider_set_update_handler(ar_accessory_tracking_provider_t accessory_tracking_provider, dispatch_queue_t accessory_tracking_updates_queue, ar_accessory_tracking_update_handler_t accessory_tracking_update_handler);`](/documentation/ARKit/ar_accessory_tracking_provider_set_update_handler) Set the handler for receiving accessory anchor updates. [`extern void ar_accessory_tracking_provider_set_update_handler_f(ar_accessory_tracking_provider_t accessory_tracking_provider, dispatch_queue_t accessory_tracking_updates_queue, void *context, ar_accessory_tracking_update_handler_function_t accessory_tracking_update_handler_function);`](/documentation/ARKit/ar_accessory_tracking_provider_set_update_handler_f) Set the function for receiving accessory tracking updates. [`extern void ar_accessory_tracking_provider_update_accessories(ar_accessory_tracking_provider_t accessory_tracking_provider, ar_accessories_t accessories, ar_accessory_tracking_update_accessories_completion_handler_t completion_handler);`](/documentation/ARKit/ar_accessory_tracking_provider_update_accessories) Update the accessories being tracked by a provider. [`extern void ar_accessory_tracking_provider_update_accessories_f(ar_accessory_tracking_provider_t accessory_tracking_provider, ar_accessories_t accessories, void *context, ar_accessory_tracking_update_accessories_completion_handler_function_t completion_handler_function);`](/documentation/ARKit/ar_accessory_tracking_provider_update_accessories_f) Update the accessories being tracked by a provider. [`typedef enum { ... } ar_accessory_anchor_tracking_state_t;`](/documentation/ARKit/ar_accessory_anchor_tracking_state_t) Tracking status for accessory anchors. [`typedef enum { ... } ar_accessory_chirality_t;`](/documentation/ARKit/ar_accessory_chirality_t) The chirality of an accessory. [`typedef enum { ... } ar_accessory_source_type_t;`](/documentation/ARKit/ar_accessory_source_type_t) The type of input that was used to initialize an `ar_accessory_t`. [`typedef enum { ... } ar_accessory_tracking_error_code_t;`](/documentation/ARKit/ar_accessory_tracking_error_code_t) Error codes specific to accessory tracking. [`typedef enum { ... } ar_transform_correction_t;`](/documentation/ARKit/ar_transform_correction_t) A correction type to apply for transforms returned from ARKit APIs. [`typedef void (*)(void *, _Bool, NSObject *) ar_accessory_tracking_update_accessories_completion_handler_function_t;`](/documentation/ARKit/ar_accessory_tracking_update_accessories_completion_handler_function_t) Function triggered when a request to update accessories has completed. [`typedef void (^)(_Bool, NSObject *) ar_accessory_tracking_update_accessories_completion_handler_t;`](/documentation/ARKit/ar_accessory_tracking_update_accessories_completion_handler_t) Handler triggered when a request to update accessories has completed. ### Camera sampling [`typedef _Bool (*)(void *, NSObject *) ar_camera_frame_sample_enumerator_function_t;`](/documentation/ARKit/ar_camera_frame_sample_enumerator_function_t) Function for enumerating camera frame samples. [`typedef _Bool (^)(NSObject *) ar_camera_frame_sample_enumerator_t;`](/documentation/ARKit/ar_camera_frame_sample_enumerator_t) Handler for enumerating camera frame samples. [`typedef NSObject * ar_camera_frame_samples_t;`](/documentation/ARKit/ar_camera_frame_samples_t) A collection of camera frame samples. [`extern ar_camera_frame_samples_tar_camera_frame_get_frame_samples(ar_camera_frame_t camera_frame);`](/documentation/ARKit/ar_camera_frame_get_frame_samples) Get the collection of camera frame samples for this camera frame. [`extern void ar_camera_frame_samples_enumerate_frame_samples(ar_camera_frame_samples_t camera_frame_samples, ar_camera_frame_sample_enumerator_t camera_frame_sample_enumerator);`](/documentation/ARKit/ar_camera_frame_samples_enumerate_frame_samples) Enumerate all camera frame samples in this collection. [`extern void ar_camera_frame_samples_enumerate_frame_samples_f(ar_camera_frame_samples_t camera_frame_samples, void *context, ar_camera_frame_sample_enumerator_function_t camera_frame_sample_enumerator_function);`](/documentation/ARKit/ar_camera_frame_samples_enumerate_frame_samples_f) Enumerate all supported camera frame samples for this configuration using a function. [`extern size_t ar_camera_frame_samples_get_count(ar_camera_frame_samples_t camera_frame_samples);`](/documentation/ARKit/ar_camera_frame_samples_get_count) Get the count of camera frame samples in the collection. [`extern ar_camera_rectification_type_t ar_camera_video_format_get_camera_rectification_type(ar_camera_video_format_t video_format);`](/documentation/ARKit/ar_camera_video_format_get_camera_rectification_type) Get the camera rectification type for this video format. [`typedef enum { ... } ar_camera_rectification_type_t;`](/documentation/ARKit/ar_camera_rectification_type_t) A value describing the type of rectification applied to a video format. ### Camera region [`typedef void (*)(void *, NSObject *, _Bool, NSObject *) ar_camera_region_add_anchor_completion_handler_function_t;`](/documentation/ARKit/ar_camera_region_add_anchor_completion_handler_function_t) Function called when a request to add a camera region anchor has completed (successfully or not). [`typedef void (^)(NSObject *, _Bool, NSObject *) ar_camera_region_add_anchor_completion_handler_t;`](/documentation/ARKit/ar_camera_region_add_anchor_completion_handler_t) Handler called when a request to add a camera region anchor has completed (successfully or not). [`typedef NSObject * ar_camera_region_anchor_t;`](/documentation/ARKit/ar_camera_region_anchor_t) An anchor representing a camera region with enhanced image processing. [`typedef void (*)(void *, NSObject *, NSObject *, NSObject *) ar_camera_region_anchor_update_handler_function_t;`](/documentation/ARKit/ar_camera_region_anchor_update_handler_function_t) Function called when there are updates to a specific camera region anchor. [`typedef void (^)(NSObject *, NSObject *, NSObject *) ar_camera_region_anchor_update_handler_t;`](/documentation/ARKit/ar_camera_region_anchor_update_handler_t) Handler called when there are updates to a specific camera region anchor. [`typedef _Bool (*)(void *, NSObject *) ar_camera_region_anchors_enumerator_function_t;`](/documentation/ARKit/ar_camera_region_anchors_enumerator_function_t) Function for enumerating a collection of camera region anchors. [`typedef _Bool (^)(NSObject *) ar_camera_region_anchors_enumerator_t;`](/documentation/ARKit/ar_camera_region_anchors_enumerator_t) Handler for enumerating a collection of camera region anchors. [`typedef NSObject * ar_camera_region_anchors_t;`](/documentation/ARKit/ar_camera_region_anchors_t) A collection of camera region anchors. [`typedef NSObject * ar_camera_region_configuration_t;`](/documentation/ARKit/ar_camera_region_configuration_t) Configuration for camera region processing. [`typedef NSObject * ar_camera_region_provider_t;`](/documentation/ARKit/ar_camera_region_provider_t) A data provider for camera region processing. [`typedef void (*)(void *, NSObject *, _Bool, NSObject *) ar_camera_region_remove_anchor_completion_handler_function_t;`](/documentation/ARKit/ar_camera_region_remove_anchor_completion_handler_function_t) Function called when a request to remove a camera region anchor has completed (successfully or not). [`typedef void (^)(NSObject *, _Bool, NSObject *) ar_camera_region_remove_anchor_completion_handler_t;`](/documentation/ARKit/ar_camera_region_remove_anchor_completion_handler_t) Handler called when a request to remove a camera region anchor has completed (successfully or not). [`typedef void (*)(void *, unsigned char *, _Bool, NSObject *) ar_camera_region_remove_anchor_with_identifier_completion_handler_function_t;`](/documentation/ARKit/ar_camera_region_remove_anchor_with_identifier_completion_handler_function_t) Function called when a request to remove a camera region anchor by its identifier has completed (successfully or not). [`typedef void (^)(unsigned char *, _Bool, NSObject *) ar_camera_region_remove_anchor_with_identifier_completion_handler_t;`](/documentation/ARKit/ar_camera_region_remove_anchor_with_identifier_completion_handler_t) Handler called when a request to remove a camera region anchor by its identifier has completed (successfully or not). [`extern ar_camera_region_anchor_tar_camera_region_anchor_create_with_parameters(simd_float4x4 origin_from_anchor_transform, float width, float height, ar_camera_region_camera_enhancement_t camera_enhancement);`](/documentation/ARKit/ar_camera_region_anchor_create_with_parameters) Create a camera region anchor using a transform from the anchor to the origin coordinate system, a specified size, and a camera enhancement. [`extern ar_camera_region_camera_enhancement_t ar_camera_region_anchor_get_camera_enhancement(ar_camera_region_anchor_t camera_region_anchor);`](/documentation/ARKit/ar_camera_region_anchor_get_camera_enhancement) Get the camera enhancement type for a given anchor. [`extern float ar_camera_region_anchor_get_height(ar_camera_region_anchor_t camera_region_anchor);`](/documentation/ARKit/ar_camera_region_anchor_get_height) Get the height of a given anchor. [`extern void ar_camera_region_anchor_get_identifier(ar_camera_region_anchor_t camera_region_anchor, uuid_t out_identifier);`](/documentation/ARKit/ar_camera_region_anchor_get_identifier) Get the identifier of an anchor. [`extern simd_float4x4 ar_camera_region_anchor_get_origin_from_anchor_transform(ar_camera_region_anchor_t camera_region_anchor);`](/documentation/ARKit/ar_camera_region_anchor_get_origin_from_anchor_transform) Get the transform from an anchor to the origin coordinate system. [`extern CVPixelBufferRefar_camera_region_anchor_get_pixel_buffer(ar_camera_region_anchor_t camera_region_anchor);`](/documentation/ARKit/ar_camera_region_anchor_get_pixel_buffer) Get the `CVPixelBufferRef` for this anchor. [`extern CFTimeInterval ar_camera_region_anchor_get_timestamp(ar_camera_region_anchor_t camera_region_anchor);`](/documentation/ARKit/ar_camera_region_anchor_get_timestamp) Get the timestamp corresponding to an anchor. [`extern float ar_camera_region_anchor_get_width(ar_camera_region_anchor_t camera_region_anchor);`](/documentation/ARKit/ar_camera_region_anchor_get_width) Get the width of a given anchor. [`extern bool ar_camera_region_anchor_is_equal_to_camera_region_anchor(ar_camera_region_anchor_t camera_region_anchor, ar_camera_region_anchor_t other_camera_region_anchor);`](/documentation/ARKit/ar_camera_region_anchor_is_equal_to_camera_region_anchor) Returns a bool value that indicates whether the two camera region anchors are equal. [`extern void ar_camera_region_anchors_enumerate_anchors(ar_camera_region_anchors_t camera_region_anchors, ar_camera_region_anchors_enumerator_t camera_region_anchors_enumerator);`](/documentation/ARKit/ar_camera_region_anchors_enumerate_anchors) Enumerate a collection of camera region anchors. [`extern void ar_camera_region_anchors_enumerate_anchors_f(ar_camera_region_anchors_t camera_region_anchors, void *context, ar_camera_region_anchors_enumerator_function_t camera_region_anchors_enumerator_function);`](/documentation/ARKit/ar_camera_region_anchors_enumerate_anchors_f) Enumerate a collection of camera region anchors using a function. [`extern size_t ar_camera_region_anchors_get_count(ar_camera_region_anchors_t camera_region_anchors);`](/documentation/ARKit/ar_camera_region_anchors_get_count) Get the count of camera region anchors in a collection. [`extern ar_camera_region_configuration_tar_camera_region_configuration_create();`](/documentation/ARKit/ar_camera_region_configuration_create) Create a camera region configuration. [`extern void ar_camera_region_provider_add_camera_region_anchor(ar_camera_region_provider_t camera_region_provider, ar_camera_region_anchor_t camera_region_anchor, ar_camera_region_add_anchor_completion_handler_t add_anchor_completion_handler);`](/documentation/ARKit/ar_camera_region_provider_add_camera_region_anchor) Add a camera region anchor to a camera region provider. [`extern void ar_camera_region_provider_add_camera_region_anchor_f(ar_camera_region_provider_t camera_region_provider, ar_camera_region_anchor_t camera_region_anchor, void *context, ar_camera_region_add_anchor_completion_handler_function_t add_anchor_completion_handler_function);`](/documentation/ARKit/ar_camera_region_provider_add_camera_region_anchor_f) Add a camera region anchor to an camera region provider using a function. [`extern ar_camera_region_provider_tar_camera_region_provider_create(ar_camera_region_configuration_t camera_region_configuration);`](/documentation/ARKit/ar_camera_region_provider_create) Create a camera region provider. [`extern ar_authorization_type_t ar_camera_region_provider_get_required_authorization_type();`](/documentation/ARKit/ar_camera_region_provider_get_required_authorization_type) Get the authorization type required by the camera region provider. [`extern bool ar_camera_region_provider_is_supported();`](/documentation/ARKit/ar_camera_region_provider_is_supported) Determine whether this device supports the camera region provider. [`extern void ar_camera_region_provider_remove_camera_region_anchor(ar_camera_region_provider_t camera_region_provider, ar_camera_region_anchor_t camera_region_anchor, ar_camera_region_remove_anchor_completion_handler_t remove_anchor_completion_handler);`](/documentation/ARKit/ar_camera_region_provider_remove_camera_region_anchor) Remove a camera region anchor from a camera region provider. [`extern void ar_camera_region_provider_remove_camera_region_anchor_f(ar_camera_region_provider_t camera_region_provider, ar_camera_region_anchor_t camera_region_anchor, void *context, ar_camera_region_remove_anchor_completion_handler_function_t remove_anchor_completion_handler_function);`](/documentation/ARKit/ar_camera_region_provider_remove_camera_region_anchor_f) Remove a camera region anchor from a camera region provider using a function. [`extern void ar_camera_region_provider_remove_camera_region_anchor_with_identifier(ar_camera_region_provider_t camera_region_provider, uuid_t camera_region_anchor_identifier, ar_camera_region_remove_anchor_with_identifier_completion_handler_t remove_anchor_with_identifier_completion_handler);`](/documentation/ARKit/ar_camera_region_provider_remove_camera_region_anchor_with_identifier) Remove a camera region anchor from a camera region provider by its identifier. [`extern void ar_camera_region_provider_remove_camera_region_anchor_with_identifier_f(ar_camera_region_provider_t camera_region_provider, uuid_t camera_region_anchor_identifier, void *context, ar_camera_region_remove_anchor_with_identifier_completion_handler_function_t remove_anchor_with_identifier_completion_handler_function);`](/documentation/ARKit/ar_camera_region_provider_remove_camera_region_anchor_with_identifier_f) Remove a camera region anchor from a camera region provider by its identifier using a function. [`extern void ar_camera_region_provider_set_update_handler_for_anchor_with_identifier(ar_camera_region_provider_t camera_region_provider, uuid_t camera_region_anchor_identifier, dispatch_queue_t camera_region_anchor_updates_queue, ar_camera_region_anchor_update_handler_t camera_region_anchor_update_handler);`](/documentation/ARKit/ar_camera_region_provider_set_update_handler_for_anchor_with_identifier) Set the handler for receiving camera region updates for a specific anchor identifier. [`extern void ar_camera_region_provider_set_update_handler_for_anchor_with_identifier_f(ar_camera_region_provider_t camera_region_provider, uuid_t camera_region_anchor_identifier, dispatch_queue_t camera_region_anchor_updates_queue, void *context, ar_camera_region_anchor_update_handler_function_t camera_region_anchor_update_handler_function);`](/documentation/ARKit/ar_camera_region_provider_set_update_handler_for_anchor_with_identifier_f) Set the function for receiving camera region updates for a specific anchor identifier. [`typedef enum { ... } ar_camera_region_camera_enhancement_t;`](/documentation/ARKit/ar_camera_region_camera_enhancement_t) Enum describing camera enhancement types. [`typedef enum { ... } ar_camera_region_error_code_t;`](/documentation/ARKit/ar_camera_region_error_code_t) Error codes specific to the camera region provider. [`extern simd_float4x4 ar_camera_region_anchor_get_origin_from_anchor_transform_with_correction(ar_camera_region_anchor_t camera_region_anchor, ar_transform_correction_t transform_correction);`](/documentation/ARKit/ar_camera_region_anchor_get_origin_from_anchor_transform_with_correction) Get the transform from an anchor to the origin coordinate system. ### Coordinate spaces [`typedef NSObject * ar_coordinate_space_data_t;`](/documentation/ARKit/ar_coordinate_space_data_t) Data for sharing coordinate space information between participants. [`extern CFDataRefar_coordinate_space_data_copy_cfdata(ar_coordinate_space_data_t data);`](/documentation/ARKit/ar_coordinate_space_data_copy_cfdata) Copy out a `CFDataRef` that archives the coordinate space data. [`extern ar_identifiers_tar_coordinate_space_data_copy_recipient_identifers(ar_coordinate_space_data_t shared_coordinate_space_data);`](/documentation/ARKit/ar_coordinate_space_data_copy_recipient_identifers) Copy the list of participant identifiers of the intended recipient for this data. Data should be broadcast if the list is empty. [`extern ar_coordinate_space_data_tar_coordinate_space_data_create_from_cfdata(CFDataRef cfData);`](/documentation/ARKit/ar_coordinate_space_data_create_from_cfdata) Create and initialize an `ar_coordinate_space_data_t` object from a `CFDataRef`. [`extern ar_identifiers_tar_coordinate_space_data_copy_recipient_identifiers(ar_coordinate_space_data_t shared_coordinate_space_data);`](/documentation/ARKit/ar_coordinate_space_data_copy_recipient_identifiers) Copy the list of participant identifiers of the intended recipient for this data. Data should be broadcast if the list is empty. ### Shared coordinate spaces [`typedef NSObject * ar_shared_coordinate_space_configuration_t;`](/documentation/ARKit/ar_shared_coordinate_space_configuration_t) Configuration for the shared coordinate space provider. [`typedef void (*)(void *, NSObject *) ar_shared_coordinate_space_connected_participants_update_handler_function_t;`](/documentation/ARKit/ar_shared_coordinate_space_connected_participants_update_handler_function_t) Function called when there are updates to the shared coordinate space participant status. [`typedef void (^)(NSObject *) ar_shared_coordinate_space_connected_participants_update_handler_t;`](/documentation/ARKit/ar_shared_coordinate_space_connected_participants_update_handler_t) A handler that the provider calls when there is an update to the shared coordinate space connected participants. [`typedef NSObject * ar_shared_coordinate_space_provider_t;`](/documentation/ARKit/ar_shared_coordinate_space_provider_t) A data provider for shared coordinate spaces across participants. [`typedef void (^)(void *, _Bool) ar_shared_coordinate_space_sharing_status_update_handler_function_t;`](/documentation/ARKit/ar_shared_coordinate_space_sharing_status_update_handler_function_t) Function called when there is an update to the shared coordinate space sharing status. [`typedef void (^)(_Bool) ar_shared_coordinate_space_sharing_status_update_handler_t;`](/documentation/ARKit/ar_shared_coordinate_space_sharing_status_update_handler_t) A handler that the provider calls when there is an update to the shared coordinate space sharing status. [`extern void ar_shared_coordinate_provider_set_connected_participants_update_handler_f(ar_shared_coordinate_space_provider_t shared_coordinate_space_provider, dispatch_queue_t connected_participants_update_queue, void *context, ar_shared_coordinate_space_connected_participants_update_handler_function_t connected_participants_update_handler_function);`](/documentation/ARKit/ar_shared_coordinate_provider_set_connected_participants_update_handler_f) Set the function for receiving shared coordinate space connected participants updates. [`extern ar_shared_coordinate_space_configuration_tar_shared_coordinate_space_configuration_create();`](/documentation/ARKit/ar_shared_coordinate_space_configuration_create) Create a shared coordinate space configuration. [`extern ar_coordinate_space_data_tar_shared_coordinate_space_provider_copy_next_coordinate_space_data(ar_shared_coordinate_space_provider_t shared_coordinate_space_provider);`](/documentation/ARKit/ar_shared_coordinate_space_provider_copy_next_coordinate_space_data) Copy the next collaboration data. [`extern ar_shared_coordinate_space_provider_tar_shared_coordinate_space_provider_create(ar_shared_coordinate_space_configuration_t shared_coordinate_space_configuration);`](/documentation/ARKit/ar_shared_coordinate_space_provider_create) Create a shared coordinate space provider. [`extern void ar_shared_coordinate_space_provider_get_participant_identifier(ar_shared_coordinate_space_provider_t shared_coordinate_space_provider, uuid_t out_identifier);`](/documentation/ARKit/ar_shared_coordinate_space_provider_get_participant_identifier) Get the identifier used to identify the participant in the shared coordinate space. [`extern ar_authorization_type_t ar_shared_coordinate_space_provider_get_required_authorization_type();`](/documentation/ARKit/ar_shared_coordinate_space_provider_get_required_authorization_type) Get the authorization type required by the shared coordinate space provider. [`extern bool ar_shared_coordinate_space_provider_is_supported();`](/documentation/ARKit/ar_shared_coordinate_space_provider_is_supported) Determines whether this device supports the shared coordinate space provider. [`extern void ar_shared_coordinate_space_provider_push_data(ar_shared_coordinate_space_provider_t shared_coordinate_space_provider, ar_coordinate_space_data_t coordinate_space_data);`](/documentation/ARKit/ar_shared_coordinate_space_provider_push_data) Push data to the shared coordinate space provider. [`extern void ar_shared_coordinate_space_provider_set_connected_participants_update_handler(ar_shared_coordinate_space_provider_t shared_coordinate_space_provider, dispatch_queue_t connected_participants_update_queue, ar_shared_coordinate_space_connected_participants_update_handler_t connected_participants_update_handler);`](/documentation/ARKit/ar_shared_coordinate_space_provider_set_connected_participants_update_handler) Set the handler for receiving shared coordinate space connected participants updates. [`extern void ar_shared_coordinate_space_provider_set_sharing_status_update_handler(ar_shared_coordinate_space_provider_t shared_coordinate_space_provider, dispatch_queue_t status_updates_queue, ar_shared_coordinate_space_sharing_status_update_handler_t sharing_status_update_handler);`](/documentation/ARKit/ar_shared_coordinate_space_provider_set_sharing_status_update_handler) Set the handler for receiving sharing status updates. [`extern void ar_shared_coordinate_space_provider_set_sharing_status_update_handler_f(ar_shared_coordinate_space_provider_t shared_coordinate_space_provider, dispatch_queue_t status_updates_queue, void *context, ar_shared_coordinate_space_sharing_status_update_handler_function_t sharing_status_update_handler_function);`](/documentation/ARKit/ar_shared_coordinate_space_provider_set_sharing_status_update_handler_f) Set the function for receiving sharing status updates. [`extern bool ar_shared_coordinate_space_provider_is_sharing_enabled(ar_shared_coordinate_space_provider_t shared_coordinate_space_provider);`](/documentation/ARKit/ar_shared_coordinate_space_provider_is_sharing_enabled) Get the latest sharing status. ### Rendering [`typedef NSObject * ar_stereo_properties_configuration_t;`](/documentation/ARKit/ar_stereo_properties_configuration_t) Configuration for the stereo properties provider. [`typedef NSObject * ar_stereo_properties_provider_t;`](/documentation/ARKit/ar_stereo_properties_provider_t) A data provider that provides stereo viewpoint properties. [`extern ar_stereo_properties_configuration_tar_stereo_properties_configuration_create();`](/documentation/ARKit/ar_stereo_properties_configuration_create) Create a stereo properties configuration object. [`extern ar_stereo_properties_provider_tar_stereo_properties_provider_create(ar_stereo_properties_configuration_t configuration);`](/documentation/ARKit/ar_stereo_properties_provider_create) Create a stereo properties provider. [`extern ar_authorization_type_t ar_stereo_properties_provider_get_required_authorization_type();`](/documentation/ARKit/ar_stereo_properties_provider_get_required_authorization_type) Get the authorization type required by the stereo properties provider. [`extern bool ar_stereo_properties_provider_get_viewpoint_properties(ar_stereo_properties_provider_t stereo_properties_provider, ar_viewpoint_properties_t viewpoint_properties);`](/documentation/ARKit/ar_stereo_properties_provider_get_viewpoint_properties) Returns the latest viewpoint properties. [`extern bool ar_stereo_properties_provider_is_supported();`](/documentation/ARKit/ar_stereo_properties_provider_is_supported) Determines whether this device supports the stereo properties provider. [`extern ar_viewpoint_properties_tar_viewpoint_properties_create();`](/documentation/ARKit/ar_viewpoint_properties_create) Create an `ar_viewpoint_properties_t`. [`extern simd_float4x4 ar_viewpoint_properties_get_device_from_left_viewpoint_transform(ar_viewpoint_properties_t viewpoint_properties);`](/documentation/ARKit/ar_viewpoint_properties_get_device_from_left_viewpoint_transform) Get the transformation matrix that converts from the left viewpoint to the device’s coordinate space. [`extern simd_float4x4 ar_viewpoint_properties_get_device_from_right_viewpoint_transform(ar_viewpoint_properties_t viewpoint_properties);`](/documentation/ARKit/ar_viewpoint_properties_get_device_from_right_viewpoint_transform) Get the transformation matrix that converts from the right viewpoint to the device’s coordinate space. [`typedef NSObject * ar_viewpoint_properties_t;`](/documentation/ARKit/ar_viewpoint_properties_t) Properties describing the stereo viewpoints of the device. ### Visual fidelity [`extern void ar_polygon_points_add_point(ar_polygon_points_t polygon_points, simd_float2 point);`](/documentation/ARKit/ar_polygon_points_add_point) Adds a single point to the polygon points collection. [`extern void ar_polygon_points_add_points(ar_polygon_points_t polygon_points, const simd_float2 *points, size_t point_count);`](/documentation/ARKit/ar_polygon_points_add_points) Adds multiple points to the polygon points collection. [`extern ar_polygon_points_tar_polygon_points_create();`](/documentation/ARKit/ar_polygon_points_create) Creates a new empty polygon points collection. [`extern size_t ar_polygon_points_get_count(ar_polygon_points_t polygon_points);`](/documentation/ARKit/ar_polygon_points_get_count) Gets the number of points in the collection. [`extern simd_float2 ar_polygon_points_get_point_at_index(ar_polygon_points_t polygon_points, size_t index);`](/documentation/ARKit/ar_polygon_points_get_point_at_index) Gets a point at a specific index. [`extern bool ar_polygon_points_is_equal_to_polygon_points(ar_polygon_points_t polygon_points, ar_polygon_points_t other_polygon_points);`](/documentation/ARKit/ar_polygon_points_is_equal_to_polygon_points) Check if two polygon points collections are equal. [`typedef NSObject * ar_polygon_points_t;`](/documentation/ARKit/ar_polygon_points_t) A collection of 2D polygon points. [`typedef NSObject * ar_reference_object_configuration_t;`](/documentation/ARKit/ar_reference_object_configuration_t) Defines a configuration for an individual reference object. [`extern void ar_field_of_view_anchor_get_identifier(ar_field_of_view_anchor_t anchor, uuid_t out_identifier);`](/documentation/ARKit/ar_field_of_view_anchor_get_identifier) Get the identifier of the field of view anchor. [`extern ar_polygon_points_tar_field_of_view_anchor_get_left_polygon_points(ar_field_of_view_anchor_t anchor);`](/documentation/ARKit/ar_field_of_view_anchor_get_left_polygon_points) Get the left eye polygon boundary points defining the preset FoV. [`extern simd_float4x4 ar_field_of_view_anchor_get_origin_from_anchor_transform(ar_field_of_view_anchor_t anchor);`](/documentation/ARKit/ar_field_of_view_anchor_get_origin_from_anchor_transform) Get the transform from the anchor to the origin coordinate system. [`extern simd_float4x4 ar_field_of_view_anchor_get_origin_from_anchor_transform_with_correction(ar_field_of_view_anchor_t anchor, ar_transform_correction_t transform_correction);`](/documentation/ARKit/ar_field_of_view_anchor_get_origin_from_anchor_transform_with_correction) Get the transform from an anchor to the origin coordinate system with a transform correction option. [`extern ar_polygon_points_tar_field_of_view_anchor_get_right_polygon_points(ar_field_of_view_anchor_t anchor);`](/documentation/ARKit/ar_field_of_view_anchor_get_right_polygon_points) Get the right eye polygon boundary points defining the preset FoV. [`extern CFTimeInterval ar_field_of_view_anchor_get_timestamp(ar_field_of_view_anchor_t anchor);`](/documentation/ARKit/ar_field_of_view_anchor_get_timestamp) Get the timestamp of the field of view anchor. [`extern bool ar_field_of_view_anchor_is_equal_to_field_of_view_anchor(ar_field_of_view_anchor_t anchor, ar_field_of_view_anchor_t other_anchor);`](/documentation/ARKit/ar_field_of_view_anchor_is_equal_to_field_of_view_anchor) Check if two field of view anchors are equal. [`extern ar_field_of_view_tar_field_of_view_create_polygon(ar_polygon_points_t polygon_points);`](/documentation/ARKit/ar_field_of_view_create_polygon) Create a polygon-based field of view. [`extern ar_field_of_view_tar_field_of_view_create_preset_a();`](/documentation/ARKit/ar_field_of_view_create_preset_a) Create a preset field of view A. [`extern ar_field_of_view_tar_field_of_view_create_preset_b();`](/documentation/ARKit/ar_field_of_view_create_preset_b) Create a preset field of view B. [`extern ar_field_of_view_tar_field_of_view_create_preset_c();`](/documentation/ARKit/ar_field_of_view_create_preset_c) Create a preset field of view C. [`extern ar_field_of_view_tar_field_of_view_create_preset_d();`](/documentation/ARKit/ar_field_of_view_create_preset_d) Create a preset field of view D. [`extern bool ar_field_of_view_is_valid(ar_field_of_view_t field_of_view);`](/documentation/ARKit/ar_field_of_view_is_valid) Validate whether a field of view specification is valid. [`typedef NSObject * ar_field_of_view_anchor_t;`](/documentation/ARKit/ar_field_of_view_anchor_t) An anchor representing a set of field of view boundary polygon points in immersive space. [`typedef void (*)(void *, NSObject *) ar_field_of_view_anchor_update_handler_function_t;`](/documentation/ARKit/ar_field_of_view_anchor_update_handler_function_t) Function called when a field of view anchor is updated. [`typedef void (^)(NSObject *) ar_field_of_view_anchor_update_handler_t;`](/documentation/ARKit/ar_field_of_view_anchor_update_handler_t) Handler called when a field of view anchor is updated. [`typedef NSObject * ar_field_of_view_t;`](/documentation/ARKit/ar_field_of_view_t) Field of view specification. [`typedef NSObject * ar_visual_fidelity_configuration_t;`](/documentation/ARKit/ar_visual_fidelity_configuration_t) Configuration object for visual fidelity monitoring. [`typedef NSObject * ar_visual_fidelity_data_t;`](/documentation/ARKit/ar_visual_fidelity_data_t) Visual fidelity data object containing device fit and field of view validation results. [`typedef NSObject * ar_visual_fidelity_provider_t;`](/documentation/ARKit/ar_visual_fidelity_provider_t) Data provider for visual fidelity monitoring. [`typedef void (*)(void *, NSObject *) ar_visual_fidelity_update_handler_function_t;`](/documentation/ARKit/ar_visual_fidelity_update_handler_function_t) Function called when visual fidelity data is updated. [`typedef void (^)(NSObject *) ar_visual_fidelity_update_handler_t;`](/documentation/ARKit/ar_visual_fidelity_update_handler_t) Handler called when visual fidelity data is updated. [`extern ar_visual_fidelity_configuration_tar_visual_fidelity_configuration_create();`](/documentation/ARKit/ar_visual_fidelity_configuration_create) Create a visual fidelity configuration. [`extern void ar_visual_fidelity_configuration_set_field_of_view(ar_visual_fidelity_configuration_t visual_fidelity_configuration, ar_field_of_view_t field_of_view);`](/documentation/ARKit/ar_visual_fidelity_configuration_set_field_of_view) Set the field of view specification to monitor. [`extern void ar_visual_fidelity_configuration_set_present_coaching_alerts(ar_visual_fidelity_configuration_t visual_fidelity_configuration, bool present_coaching_alerts);`](/documentation/ARKit/ar_visual_fidelity_configuration_set_present_coaching_alerts) Request whether coaching alerts should be automatically presented to the user. [`extern void ar_visual_fidelity_configuration_set_request_device_fit_updates(ar_visual_fidelity_configuration_t visual_fidelity_configuration, bool request_device_fit_updates);`](/documentation/ARKit/ar_visual_fidelity_configuration_set_request_device_fit_updates) Request whether device fit updates should be included in fidelity data. [`extern ar_device_fit_status_t ar_visual_fidelity_data_get_device_fit_status(ar_visual_fidelity_data_t fidelity_data);`](/documentation/ARKit/ar_visual_fidelity_data_get_device_fit_status) Get the device fit validation status. [`extern bool ar_visual_fidelity_data_is_equal_to_visual_fidelity_data(ar_visual_fidelity_data_t fidelity_data, ar_visual_fidelity_data_t other_fidelity_data);`](/documentation/ARKit/ar_visual_fidelity_data_is_equal_to_visual_fidelity_data) Check if two visual fidelity data instances are equal. [`extern CFTimeInterval ar_visual_fidelity_data_get_timestamp(ar_visual_fidelity_data_t fidelity_data);`](/documentation/ARKit/ar_visual_fidelity_data_get_timestamp) Get the timestamp when this validation data was captured. [`extern bool ar_visual_fidelity_data_is_field_of_view_valid(ar_visual_fidelity_data_t fidelity_data);`](/documentation/ARKit/ar_visual_fidelity_data_is_field_of_view_valid) Check if the field of view is valid. [`extern bool ar_visual_fidelity_data_is_equal_to_visual_fidelity_data(ar_visual_fidelity_data_t fidelity_data, ar_visual_fidelity_data_t other_fidelity_data);`](/documentation/ARKit/ar_visual_fidelity_data_is_equal_to_visual_fidelity_data) Check if two visual fidelity data instances are equal. [`extern ar_visual_fidelity_provider_tar_visual_fidelity_provider_create(ar_visual_fidelity_configuration_t visual_fidelity_configuration);`](/documentation/ARKit/ar_visual_fidelity_provider_create) Create a visual fidelity data provider. [`extern ar_authorization_type_t ar_visual_fidelity_provider_get_required_authorization_type();`](/documentation/ARKit/ar_visual_fidelity_provider_get_required_authorization_type) Get the authorization type required by the visual fidelity data provider. [`extern bool ar_visual_fidelity_provider_is_supported();`](/documentation/ARKit/ar_visual_fidelity_provider_is_supported) Determine whether this device supports the visual fidelity data provider. [`extern void ar_visual_fidelity_provider_set_anchor_update_handler(ar_visual_fidelity_provider_t visual_fidelity_data_provider, dispatch_queue_t anchor_updates_queue, ar_field_of_view_anchor_update_handler_t anchor_update_handler);`](/documentation/ARKit/ar_visual_fidelity_provider_set_anchor_update_handler) Set the handler for receiving field of view anchor updates. [`extern void ar_visual_fidelity_provider_set_anchor_update_handler_f(ar_visual_fidelity_provider_t visual_fidelity_data_provider, dispatch_queue_t anchor_updates_queue, void *context, ar_field_of_view_anchor_update_handler_function_t anchor_update_handler_function);`](/documentation/ARKit/ar_visual_fidelity_provider_set_anchor_update_handler_f) Set the function for receiving field of view anchor updates. [`extern void ar_visual_fidelity_provider_set_update_handler(ar_visual_fidelity_provider_t visual_fidelity_data_provider, dispatch_queue_t fidelity_data_updates_queue, ar_visual_fidelity_update_handler_t fidelity_data_update_handler);`](/documentation/ARKit/ar_visual_fidelity_provider_set_update_handler) Set the handler for receiving visual fidelity data updates. [`extern void ar_visual_fidelity_provider_set_update_handler_f(ar_visual_fidelity_provider_t visual_fidelity_data_provider, dispatch_queue_t fidelity_data_updates_queue, void *context, ar_visual_fidelity_update_handler_function_t fidelity_data_update_handler_function);`](/documentation/ARKit/ar_visual_fidelity_provider_set_update_handler_f) Set the function for receiving visual fidelity data updates. [`typedef enum { ... } ar_device_fit_status_t;`](/documentation/ARKit/ar_device_fit_status_t) Device fit validation status. ### Object tracking [`extern ar_object_tracking_provider_tar_object_tracking_provider_create(ar_object_tracking_configuration_t object_tracking_configuration);`](/documentation/ARKit/ar_object_tracking_provider_create) [`extern ar_object_anchors_tar_object_tracking_provider_copy_all_object_anchors(ar_object_tracking_provider_t object_tracking_provider);`](/documentation/ARKit/ar_object_tracking_provider_copy_all_object_anchors) [`extern ar_authorization_type_t ar_object_tracking_provider_get_required_authorization_type();`](/documentation/ARKit/ar_object_tracking_provider_get_required_authorization_type) [`extern bool ar_object_tracking_provider_is_supported();`](/documentation/ARKit/ar_object_tracking_provider_is_supported) [`extern void ar_object_tracking_provider_set_update_handler(ar_object_tracking_provider_t object_tracking_provider, dispatch_queue_t object_tracking_updates_queue, ar_object_tracking_update_handler_t object_tracking_update_handler);`](/documentation/ARKit/ar_object_tracking_provider_set_update_handler) [`extern void ar_object_tracking_provider_set_update_handler_f(ar_object_tracking_provider_t object_tracking_provider, dispatch_queue_t object_tracking_updates_queue, void *context, ar_object_tracking_update_handler_function_t object_tracking_update_handler_function);`](/documentation/ARKit/ar_object_tracking_provider_set_update_handler_f) [`typedef enum { ... } ar_object_tracking_error_code_t;`](/documentation/ARKit/ar_object_tracking_error_code_t) An enumeration that describes object tracking errors. [`extern ar_reference_object_configuration_tar_reference_object_configuration_create();`](/documentation/ARKit/ar_reference_object_configuration_create) Create a reference object configuration. [`extern void ar_reference_object_configuration_enable_high_frame_rate_tracking(ar_reference_object_configuration_t reference_object_configuration, bool high_frame_rate_tracking_enabled);`](/documentation/ARKit/ar_reference_object_configuration_enable_high_frame_rate_tracking) Sets whether high-frame-rate tracking is enabled on this configuration. [`extern bool ar_reference_object_configuration_is_equal_to_reference_object_configuration(ar_reference_object_configuration_t reference_object_configuration, ar_reference_object_configuration_t other_reference_object_configuration);`](/documentation/ARKit/ar_reference_object_configuration_is_equal_to_reference_object_configuration) Returns a bool value that indicates whether the two reference object configurations are equal. [`extern bool ar_reference_object_configuration_is_high_frame_rate_tracking_enabled(ar_reference_object_configuration_t reference_object_configuration);`](/documentation/ARKit/ar_reference_object_configuration_is_high_frame_rate_tracking_enabled) Checks whether high-frame-rate tracking is enabled on this configuration. [`extern void ar_reference_object_load_from_url_with_configuration(CFURLRef url, ar_reference_object_configuration_t configuration, ar_reference_object_url_load_completion_handler_t completion_handler);`](/documentation/ARKit/ar_reference_object_load_from_url_with_configuration) Load a reference object from a URL. [`extern void ar_reference_object_load_from_url_with_configuration_f(CFURLRef url, ar_reference_object_configuration_t configuration, void *context, ar_reference_object_url_load_completion_handler_function_t completion_handler_function);`](/documentation/ARKit/ar_reference_object_load_from_url_with_configuration_f) Load a reference object from a URL. [`extern void ar_reference_object_load_with_name_and_configuration(const char *name, CFBundleRef bundle, ar_reference_object_configuration_t configuration, ar_reference_object_bundle_load_completion_handler_t completion_handler);`](/documentation/ARKit/ar_reference_object_load_with_name_and_configuration) Load a reference object from a bundle. [`extern void ar_reference_object_load_with_name_and_configuration_f(const char *name, CFBundleRef bundle, ar_reference_object_configuration_t configuration, void *context, ar_reference_object_bundle_load_completion_handler_function_t completion_handler_function);`](/documentation/ARKit/ar_reference_object_load_with_name_and_configuration_f) Load a reference object from a bundle. [`extern void ar_reference_object_load_from_url(CFURLRef url, ar_reference_object_url_load_completion_handler_t completion_handler);`](/documentation/ARKit/ar_reference_object_load_from_url) [`extern void ar_reference_object_load_from_url_f(CFURLRef url, void *context, ar_reference_object_url_load_completion_handler_function_t completion_handler_function);`](/documentation/ARKit/ar_reference_object_load_from_url_f) [`extern void ar_reference_object_load_with_name(const char *name, CFBundleRef bundle, ar_reference_object_bundle_load_completion_handler_t completion_handler);`](/documentation/ARKit/ar_reference_object_load_with_name) [`extern void ar_reference_object_load_with_name_f(const char *name, CFBundleRef bundle, void *context, ar_reference_object_bundle_load_completion_handler_function_t completion_handler_function);`](/documentation/ARKit/ar_reference_object_load_with_name_f) [`extern void ar_reference_objects_add_object(ar_reference_objects_t reference_objects, ar_reference_object_t object_to_add);`](/documentation/ARKit/ar_reference_objects_add_object) [`extern void ar_reference_objects_add_objects(ar_reference_objects_t reference_objects, ar_reference_objects_t objects_to_add);`](/documentation/ARKit/ar_reference_objects_add_objects) [`extern ar_reference_objects_tar_reference_objects_create();`](/documentation/ARKit/ar_reference_objects_create) [`extern void ar_reference_objects_enumerate_objects(ar_reference_objects_t reference_objects, ar_reference_objects_enumerator_t reference_objects_enumerator);`](/documentation/ARKit/ar_reference_objects_enumerate_objects) [`extern void ar_reference_objects_enumerate_objects_f(ar_reference_objects_t reference_objects, void *context, ar_reference_objects_enumerator_function_t reference_objects_enumerator_function);`](/documentation/ARKit/ar_reference_objects_enumerate_objects_f) [`extern size_t ar_reference_objects_get_count(ar_reference_objects_t reference_objects);`](/documentation/ARKit/ar_reference_objects_get_count) ### Strings [`typedef _Bool (*)(void *, const char *) ar_strings_enumerator_function_t;`](/documentation/ARKit/ar_strings_enumerator_function_t) Function for enumerating a collection of strings. [`typedef _Bool (^)(const char *) ar_strings_enumerator_t;`](/documentation/ARKit/ar_strings_enumerator_t) Handler for enumerating a collection of strings. [`typedef NSObject * ar_strings_t;`](/documentation/ARKit/ar_strings_t) A collection of strings. [`extern void ar_strings_enumerate_strings(ar_strings_t strings, ar_strings_enumerator_t strings_enumerator);`](/documentation/ARKit/ar_strings_enumerate_strings) Enumerate a collection of strings. [`extern void ar_strings_enumerate_strings_f(ar_strings_t strings, void *context, ar_strings_enumerator_function_t strings_enumerator_function);`](/documentation/ARKit/ar_strings_enumerate_strings_f) Enumerate a collection of strings using a function. [`extern size_t ar_strings_get_count(ar_strings_t strings);`](/documentation/ARKit/ar_strings_get_count) Returns the number of strings in this collection. ### Objective-C compatibility [ARKit Functions](/documentation/ARKit/arkit-functions) [ARKit Data Types](/documentation/ARKit/arkit-data-types) [Objective-C compatibility](/documentation/ARKit/objective-c-compatibility) ### Errors [`typedef NSObject * ar_error_t;`](/documentation/ARKit/ar_error_t) An error reported by ARKit. [`typedef intptr_t ar_error_code_t;`](/documentation/ARKit/ar_error_code_t) Codes that identify errors in ARKit. [`extern CFStringRef const ar_error_domain;`](/documentation/ARKit/ar_error_domain) A string that indicates the error domain in Core Foundation. [`extern ar_error_code_t ar_error_get_error_code(ar_error_t error);`](/documentation/ARKit/ar_error_get_error_code) Gets the error code associated with an error. [`extern CFErrorRefar_error_copy_cf_error(ar_error_t error);`](/documentation/ARKit/ar_error_copy_cf_error) Copies a reference to a Core Foundation error object that represents the specified ARKit error. [`#define AR_EXTERN_C_BEGIN`](/documentation/ARKit/AR_EXTERN_C_BEGIN) [`#define AR_EXTERN_C_END`](/documentation/ARKit/AR_EXTERN_C_END) ## See Also [ARKit in iOS](/documentation/ARKit/arkit-in-ios) Integrate iOS device camera and motion features to produce augmented reality experiences in your app or game. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)