# 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 [`ar_session_t`](/documentation/ARKit/ar_session_t) The main entry point for receiving data from ARKit. [`ar_session_create`](/documentation/ARKit/ar_session_create) Creates a new session. [`ar_session_create_with_device`](/documentation/ARKit/ar_session_create_with_device) Create a session connected to the specified device. [`ar_session_query_authorization_results`](/documentation/ARKit/ar_session_query_authorization_results) Checks whether the current session is authorized for particular authorization types without requesting authorization. [`ar_session_query_authorization_results_f`](/documentation/ARKit/ar_session_query_authorization_results_f) Checks whether the current session is authorized for particular authorization types without requesting authorization. [`ar_session_request_authorization`](/documentation/ARKit/ar_session_request_authorization) Requests authorization from the user to use the specified kinds of ARKit data. [`ar_session_request_authorization_f`](/documentation/ARKit/ar_session_request_authorization_f) Requests authorization from the user to use the specified kinds of ARKit data. [`ar_session_run`](/documentation/ARKit/ar_session_run) Runs a session with the data providers you supply. [`ar_session_set_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. [`ar_session_set_authorization_update_handler_f`](/documentation/ARKit/ar_session_set_authorization_update_handler_f) Sets the handler for receiving updates in authorization status for a specific authorization type. [`ar_session_copy_data_providers`](/documentation/ARKit/ar_session_copy_data_providers) Get a copy of the collection of all data providers on this session. [`ar_session_set_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. [`ar_session_set_data_provider_state_change_handler_f`](/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. [`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. [`ar_session_stop`](/documentation/ARKit/ar_session_stop) Stops a session. [`ar_device_t`](/documentation/ARKit/ar_device_t) Represents a physical device that a session can be run on. ### Memory Management [`ar_release`](/documentation/ARKit/ar_release-c.func) Releases a reference count on an ARKit object. [`ar_retain`](/documentation/ARKit/ar_retain-c.func) Adds a reference count to an ARKit object. ### Authorization [`ar_authorization_status_t`](/documentation/ARKit/ar_authorization_status_t) The authorization states for a type of ARKit data. [`ar_authorization_type_t`](/documentation/ARKit/ar_authorization_type_t) The authorization types you can request from ARKit. [`ar_authorization_result_get_authorization_type`](/documentation/ARKit/ar_authorization_result_get_authorization_type) Gets the authorization type associated with an authorization result. [`ar_authorization_result_get_status`](/documentation/ARKit/ar_authorization_result_get_status) Gets the authorization status associated with an authorization result. [`ar_authorization_results_enumerate_results`](/documentation/ARKit/ar_authorization_results_enumerate_results) Enumerates a collection of authorization results. [`ar_authorization_results_enumerate_results_f`](/documentation/ARKit/ar_authorization_results_enumerate_results_f) Enumerates a collection of authorization results. [`ar_authorization_results_get_count`](/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. [`ar_authorization_result_t`](/documentation/ARKit/ar_authorization_result_t) An authorization result. [`ar_authorization_results_enumerator_t`](/documentation/ARKit/ar_authorization_results_enumerator_t) A handler for enumerating a collection of authorization results. [`ar_authorization_results_handler_t`](/documentation/ARKit/ar_authorization_results_handler_t) A handler to call upon completion of an authorization request. [`ar_authorization_results_t`](/documentation/ARKit/ar_authorization_results_t) A collection of authorization results. [`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. [`ar_authorization_results_handler_function_t`](/documentation/ARKit/ar_authorization_results_handler_function_t) [`ar_authorization_update_handler_function_t`](/documentation/ARKit/ar_authorization_update_handler_function_t) [`ar_authorization_results_enumerator_function_t`](/documentation/ARKit/ar_authorization_results_enumerator_function_t) ### Anchors [`ar_anchor_get_identifier`](/documentation/ARKit/ar_anchor_get_identifier) Gets the unique identifier that distinguishes this anchor from all other anchors. [`ar_anchor_get_timestamp`](/documentation/ARKit/ar_anchor_get_timestamp) Gets the timestamp corresponding to the anchor. [`ar_anchor_get_origin_from_anchor_transform`](/documentation/ARKit/ar_anchor_get_origin_from_anchor_transform) Gets the transform from the anchor to the origin coordinate system. [`ar_trackable_anchor_is_tracked`](/documentation/ARKit/ar_trackable_anchor_is_tracked) Returns a Boolean value that indicates whether ARKit is tracking an anchor. [`ar_anchor_t`](/documentation/ARKit/ar_anchor_t) The identity, location, and orientation of an object in world space. [`ar_mesh_anchor_t`](/documentation/ARKit/ar_mesh_anchor_t) A surface’s position in a person’s surroundings. [`ar_mesh_anchors_t`](/documentation/ARKit/ar_mesh_anchors_t) A collection of mesh anchors. [`ar_mesh_anchors_enumerator_t`](/documentation/ARKit/ar_mesh_anchors_enumerator_t) A handler for enumerating a collection of mesh anchors. [`ar_image_anchor_t`](/documentation/ARKit/ar_image_anchor_t) A 2D image’s position in a person’s surroundings. [`ar_image_anchors_t`](/documentation/ARKit/ar_image_anchors_t) A collection of image anchors. [`ar_image_anchors_enumerator_t`](/documentation/ARKit/ar_image_anchors_enumerator_t) A handler for enumerating a collection of image anchors. [`ar_hand_anchor_t`](/documentation/ARKit/ar_hand_anchor_t) A hand’s position in a person’s surroundings. [`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. [`ar_world_anchor_t`](/documentation/ARKit/ar_world_anchor_t) A fixed location in a person’s surroundings. [`ar_world_anchors_t`](/documentation/ARKit/ar_world_anchors_t) A collection of world anchors. [`ar_world_anchors_enumerator_t`](/documentation/ARKit/ar_world_anchors_enumerator_t) A handler for enumerating a collection of world anchors. [`ar_world_anchor_sharing_availability_t`](/documentation/ARKit/ar_world_anchor_sharing_availability_t) Enumeration indicating the availability of world anchor sharing. [`ar_plane_anchor_t`](/documentation/ARKit/ar_plane_anchor_t) An anchor that represents horizontal and vertical planes. [`ar_plane_anchors_t`](/documentation/ARKit/ar_plane_anchors_t) A collection of plane anchors. [`ar_plane_anchors_enumerator_t`](/documentation/ARKit/ar_plane_anchors_enumerator_t) A handler for enumerating a collection of plane anchors. [`ar_plane_detection_provider_t`](/documentation/ARKit/ar_plane_detection_provider_t) A source of live data about planes in a person’s surroundings. [`ar_hand_skeleton_joint_name_t`](/documentation/ARKit/ar_hand_skeleton_joint_name_t) An enumeration that describes hand joint names. [`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 [`ar_data_provider_state_t`](/documentation/ARKit/ar_data_provider_state_t) The possible states of a data provider. [`ar_data_provider_get_required_authorization_type`](/documentation/ARKit/ar_data_provider_get_required_authorization_type) The kinds of authorization you need to use a particular data provider type. [`ar_data_provider_get_state`](/documentation/ARKit/ar_data_provider_get_state) Gets the current status of data coming from this provider. [`ar_data_providers_enumerator_t`](/documentation/ARKit/ar_data_providers_enumerator_t) A handler for enumerating a collection of data providers. [`ar_data_providers_t`](/documentation/ARKit/ar_data_providers_t) A collection of data providers. [`ar_data_providers_add_data_provider`](/documentation/ARKit/ar_data_providers_add_data_provider) Adds a data provider to a collection. [`ar_data_providers_add_data_providers`](/documentation/ARKit/ar_data_providers_add_data_providers) Adds multiple data providers to a collection. [`ar_data_providers_create`](/documentation/ARKit/ar_data_providers_create) Creates an empty collection of data providers. [`ar_data_providers_create_with_data_providers`](/documentation/ARKit/ar_data_providers_create_with_data_providers) Creates a collection of data providers that contains the data providers you supply. [`ar_data_providers_enumerate_data_providers_f`](/documentation/ARKit/ar_data_providers_enumerate_data_providers_f) Enumerates a collection of data providers. [`ar_data_providers_get_count`](/documentation/ARKit/ar_data_providers_get_count) Gets the number of data providers in a collection. [`ar_data_providers_enumerate_data_providers`](/documentation/ARKit/ar_data_providers_enumerate_data_providers) Enumerates a collection of data providers. [`ar_data_providers_remove_data_provider`](/documentation/ARKit/ar_data_providers_remove_data_provider) Removes a data provider from a collection. [`ar_data_providers_remove_data_providers`](/documentation/ARKit/ar_data_providers_remove_data_providers) Removes multiple data providers from a collection. [`ar_data_providers_enumerator_function_t`](/documentation/ARKit/ar_data_providers_enumerator_function_t) [`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. [`ar_data_provider_t`](/documentation/ARKit/ar_data_provider_t) A source of live data from ARKit. ### Geometry [`ar_geometry_primitive_type_t`](/documentation/ARKit/ar_geometry_primitive_type_t) The kinds of geometry primitives that a geometry element can contain. [`ar_geometry_element_get_buffer`](/documentation/ARKit/ar_geometry_element_get_buffer) Gets a Metal buffer that contains index data that defines the geometry of an object. [`ar_geometry_element_get_bytes_per_index`](/documentation/ARKit/ar_geometry_element_get_bytes_per_index) Gets the number of bytes that represent an index value. [`ar_geometry_element_get_count`](/documentation/ARKit/ar_geometry_element_get_count) Gets the number of primitives in the Metal buffer for a geometry element. [`ar_geometry_element_get_index_count_per_primitive`](/documentation/ARKit/ar_geometry_element_get_index_count_per_primitive) Gets the number of indices for each primitive. [`ar_geometry_element_get_primitive_type`](/documentation/ARKit/ar_geometry_element_get_primitive_type) Gets the kind of primitive, lines or triangles, that a geometry element contains. [`ar_geometry_source_get_buffer`](/documentation/ARKit/ar_geometry_source_get_buffer) Gets a Metal buffer that contains per-vector data for a geometry source. [`ar_geometry_source_get_components_per_vector`](/documentation/ARKit/ar_geometry_source_get_components_per_vector) Gets the number of scalar components in each vector in a geometry source. [`ar_geometry_source_get_count`](/documentation/ARKit/ar_geometry_source_get_count) Gets the number of vectors in a geometry source. [`ar_geometry_source_get_format`](/documentation/ARKit/ar_geometry_source_get_format) Gets the vertex format for data in a geometry source’s buffer. [`ar_geometry_source_get_offset`](/documentation/ARKit/ar_geometry_source_get_offset) Gets the offset, in bytes, from the beginning of a geometry source’s buffer. [`ar_geometry_source_get_stride`](/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. [`ar_geometry_element_t`](/documentation/ARKit/ar_geometry_element_t) A container for vertex indices of lines or triangles. [`ar_geometry_source_t`](/documentation/ARKit/ar_geometry_source_t) A container for geometrical vector data. [`ar_mesh_geometry_t`](/documentation/ARKit/ar_mesh_geometry_t) The shapes that make up a mesh anchor. [`ar_mesh_anchors_enumerator_function_t`](/documentation/ARKit/ar_mesh_anchors_enumerator_function_t) ### Plane detection [`ar_plane_alignment_t`](/documentation/ARKit/ar_plane_alignment_t) The kinds of alignment — horizontal or vertical — that a plane anchor can have. [`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. [`ar_plane_anchor_get_alignment`](/documentation/ARKit/ar_plane_anchor_get_alignment) Gets the alignment — horizontal or vertical — of a plane anchor relative to gravity. [`ar_plane_anchor_get_geometry`](/documentation/ARKit/ar_plane_anchor_get_geometry) Gets the shape of a plane anchor. [`ar_plane_anchor_get_plane_classification`](/documentation/ARKit/ar_plane_anchor_get_plane_classification) Gets the kind of real-world object that ARKit determines the plane anchor might be. [`ar_plane_anchors_enumerate_anchors`](/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. [`ar_plane_anchors_enumerate_anchors_f`](/documentation/ARKit/ar_plane_anchors_enumerate_anchors_f) Enumerates a collection of plane anchors. [`ar_plane_anchors_get_count`](/documentation/ARKit/ar_plane_anchors_get_count) Gets the number of plane anchors in a collection. [`ar_plane_anchor_get_surface_classification`](/documentation/ARKit/ar_plane_anchor_get_surface_classification) Get the surface classification of a plane anchor. [`ar_plane_detection_configuration_t`](/documentation/ARKit/ar_plane_detection_configuration_t) [`ar_plane_detection_provider_create`](/documentation/ARKit/ar_plane_detection_provider_create) Creates a plane detection provider for the types of planes you want to detect. [`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. [`ar_plane_geometry_get_plane_extent`](/documentation/ARKit/ar_plane_geometry_get_plane_extent) Gets the size of a plane. [`ar_plane_geometry_get_mesh_vertices`](/documentation/ARKit/ar_plane_geometry_get_mesh_vertices) Gets the vertices in the mesh that describes a plane. [`ar_plane_geometry_get_mesh_faces`](/documentation/ARKit/ar_plane_geometry_get_mesh_faces) Gets the faces in the mesh that describes a plane. [`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. [`ar_plane_detection_configuration_create`](/documentation/ARKit/ar_plane_detection_configuration_create) Creates a plane detection configuration. [`ar_plane_detection_configuration_set_alignment`](/documentation/ARKit/ar_plane_detection_configuration_set_alignment) Sets the plane alignments that you want the provider to detect. [`ar_plane_detection_provider_set_update_handler`](/documentation/ARKit/ar_plane_detection_provider_set_update_handler) Sets the handler for receiving plane detection updates. [`ar_plane_detection_provider_set_update_handler_f`](/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. [`ar_plane_extent_t`](/documentation/ARKit/ar_plane_extent_t) The size of a plane. [`ar_plane_extent_get_height`](/documentation/ARKit/ar_plane_extent_get_height) Gets the height of a plane. [`ar_plane_extent_get_plane_anchor_from_plane_extent_transform`](/documentation/ARKit/ar_plane_extent_get_plane_anchor_from_plane_extent_transform) Gets the transform of a plane anchor from its extent transform. [`ar_plane_extent_get_width`](/documentation/ARKit/ar_plane_extent_get_width) Gets the width of a plane. [`ar_plane_geometry_t`](/documentation/ARKit/ar_plane_geometry_t) The geometry of a plane anchor. [`ar_plane_detection_update_handler_t`](/documentation/ARKit/ar_plane_detection_update_handler_t) A handler for receiving updates to plane anchors. [`ar_plane_anchors_enumerator_function_t`](/documentation/ARKit/ar_plane_anchors_enumerator_function_t) [`ar_plane_detection_update_handler_function_t`](/documentation/ARKit/ar_plane_detection_update_handler_function_t) [`ARPlaneClassificationStatus`](/documentation/ARKit/ARPlaneClassificationStatus) Possible states of ARKit’s process for classifying plane anchors. [`ar_surface_classification_t`](/documentation/ARKit/ar_surface_classification_t) A value describing the classification of a surface. ### World tracking [`ar_world_anchor_create_with_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. [`ar_world_anchor_is_shared_with_nearby_participants`](/documentation/ARKit/ar_world_anchor_is_shared_with_nearby_participants) Check if a world anchor is marked to be shared with nearby participants. [`ar_world_anchor_shared_with_nearby_participants_create`](/documentation/ARKit/ar_world_anchor_shared_with_nearby_participants_create) Initialize a world anchor that should be shared with nearby participants. [`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. [`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. [`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. [`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. [`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). [`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). [`ar_world_tracking_anchor_update_handler_t`](/documentation/ARKit/ar_world_tracking_anchor_update_handler_t) A handler for receiving updates to world anchors. [`ar_world_tracking_configuration_create`](/documentation/ARKit/ar_world_tracking_configuration_create) Creates a world tracking configuration. [`ar_world_anchors_enumerate_anchors`](/documentation/ARKit/ar_world_anchors_enumerate_anchors) Enumerates a collection of world anchors. [`ar_world_anchors_enumerate_anchors_f`](/documentation/ARKit/ar_world_anchors_enumerate_anchors_f) Enumerates a collection of world anchors. [`ar_world_anchors_get_count`](/documentation/ARKit/ar_world_anchors_get_count) Gets the number of world anchors in the collection. [`ar_world_tracking_provider_create`](/documentation/ARKit/ar_world_tracking_provider_create) Creates a world tracking provider. [`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. [`ar_world_tracking_provider_query_device_anchor_at_timestamp`](/documentation/ARKit/ar_world_tracking_provider_query_device_anchor_at_timestamp) Queries the predicted pose of the current device at a given time. [`ar_world_tracking_provider_add_anchor`](/documentation/ARKit/ar_world_tracking_provider_add_anchor) Adds a world anchor you supply to the set of currently tracked anchors. [`ar_world_tracking_provider_add_anchor_f`](/documentation/ARKit/ar_world_tracking_provider_add_anchor_f) Adds a world anchor you supply to the set of currently tracked anchors. [`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. [`ar_world_tracking_provider_set_anchor_update_handler`](/documentation/ARKit/ar_world_tracking_provider_set_anchor_update_handler) Sets the handler for receiving world tracking updates. [`ar_world_tracking_provider_set_anchor_update_handler_f`](/documentation/ARKit/ar_world_tracking_provider_set_anchor_update_handler_f) Sets the handler for receiving world tracking updates. [`ar_world_tracking_provider_remove_anchor_with_identifier`](/documentation/ARKit/ar_world_tracking_provider_remove_anchor_with_identifier) Removes a world anchor from a world tracking provider based on its ID. [`ar_world_tracking_provider_remove_anchor`](/documentation/ARKit/ar_world_tracking_provider_remove_anchor) Removes a world anchor from a world tracking provider. [`ar_world_tracking_provider_remove_anchor_f`](/documentation/ARKit/ar_world_tracking_provider_remove_anchor_f) Removes a world anchor from a world tracking provider. [`ar_world_tracking_provider_remove_all_anchors`](/documentation/ARKit/ar_world_tracking_provider_remove_all_anchors) Removes all known world anchors from the world tracking provider asynchronously. [`ar_world_tracking_provider_remove_all_anchors_f`](/documentation/ARKit/ar_world_tracking_provider_remove_all_anchors_f) Removes all known world anchors from the world tracking provider asynchronously. [`ar_world_tracking_provider_remove_anchor_with_identifier_f`](/documentation/ARKit/ar_world_tracking_provider_remove_anchor_with_identifier_f) Remove a world anchor from the world tracking provider using its identifier. [`ar_world_tracking_provider_set_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. [`ar_world_tracking_provider_set_world_anchor_sharing_availability_update_handler_f`](/documentation/ARKit/ar_world_tracking_provider_set_world_anchor_sharing_availability_update_handler_f) Set the function for receiving world anchor sharing availability updates [`ar_world_tracking_configuration_t`](/documentation/ARKit/ar_world_tracking_configuration_t) [`ar_device_anchor_t`](/documentation/ARKit/ar_device_anchor_t) [`ar_device_anchor_create`](/documentation/ARKit/ar_device_anchor_create) [`ar_device_anchor_query_status_t`](/documentation/ARKit/ar_device_anchor_query_status_t) [`ar_world_anchors_enumerator_function_t`](/documentation/ARKit/ar_world_anchors_enumerator_function_t) [`ar_world_tracking_add_anchor_completion_handler_function_t`](/documentation/ARKit/ar_world_tracking_add_anchor_completion_handler_function_t) [`ar_world_tracking_anchor_update_handler_function_t`](/documentation/ARKit/ar_world_tracking_anchor_update_handler_function_t) [`ar_world_tracking_remove_anchor_completion_handler_function_t`](/documentation/ARKit/ar_world_tracking_remove_anchor_completion_handler_function_t) [`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. [`ar_world_anchor_get_origin_from_anchor_transform_with_correction`](/documentation/ARKit/ar_world_anchor_get_origin_from_anchor_transform_with_correction) Get the transform from an anchor to the origin coordinate system. [`ar_camera_position_t`](/documentation/ARKit/ar_camera_position_t) An enumeration that describes possible camera positions. [`ar_camera_type_t`](/documentation/ARKit/ar_camera_type_t) An enumeration that describes camera types. [`ar_device_anchor_tracking_state_t`](/documentation/ARKit/ar_device_anchor_tracking_state_t) Values that describe the tracking states of a device anchor. [`ar_world_tracking_error_code_t`](/documentation/ARKit/ar_world_tracking_error_code_t) The error codes for errors that world tracking providers throw. [`ar_session_error_code_t`](/documentation/ARKit/ar_session_error_code_t) The error codes for ARKit sessions. ### Scene reconstruction [`ar_scene_reconstruction_configuration_t`](/documentation/ARKit/ar_scene_reconstruction_configuration_t) [`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. [`ar_scene_reconstruction_provider_create`](/documentation/ARKit/ar_scene_reconstruction_provider_create) Creates a provider that reconstructs the person’s surroundings. [`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. [`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. [`ar_scene_reconstruction_configuration_create`](/documentation/ARKit/ar_scene_reconstruction_configuration_create) Creates a scene reconstruction configuration. [`ar_scene_reconstruction_configuration_get_scene_reconstruction_mode`](/documentation/ARKit/ar_scene_reconstruction_configuration_get_scene_reconstruction_mode) Gets the scene reconstruction mode. [`ar_scene_reconstruction_configuration_set_scene_reconstruction_mode`](/documentation/ARKit/ar_scene_reconstruction_configuration_set_scene_reconstruction_mode) Sets the scene reconstruction mode. [`ar_scene_reconstruction_provider_set_update_handler`](/documentation/ARKit/ar_scene_reconstruction_provider_set_update_handler) Sets the handler for receiving scene reconstruction updates. [`ar_scene_reconstruction_provider_set_update_handler_f`](/documentation/ARKit/ar_scene_reconstruction_provider_set_update_handler_f) Sets the handler for receiving scene reconstruction updates. [`ar_mesh_classification_t`](/documentation/ARKit/ar_mesh_classification_t) The kinds of classification a mesh anchor can have. [`ar_mesh_anchor_get_geometry`](/documentation/ARKit/ar_mesh_anchor_get_geometry) Gets the shape of a mesh anchor. [`ar_mesh_anchors_enumerate_anchors`](/documentation/ARKit/ar_mesh_anchors_enumerate_anchors) Enumerates a collection of mesh anchors. [`ar_mesh_anchors_enumerate_anchors_f`](/documentation/ARKit/ar_mesh_anchors_enumerate_anchors_f) Enumerates a collection of mesh anchors. [`ar_mesh_anchors_get_count`](/documentation/ARKit/ar_mesh_anchors_get_count) Gets the number of mesh anchors in the collection. [`ar_mesh_anchor_get_origin_from_anchor_transform_with_correction`](/documentation/ARKit/ar_mesh_anchor_get_origin_from_anchor_transform_with_correction) Get the transform from an anchor to the origin coordinate system. [`ar_mesh_geometry_get_classification`](/documentation/ARKit/ar_mesh_geometry_get_classification) Gets the classification of each face in the mesh. [`ar_mesh_geometry_get_faces`](/documentation/ARKit/ar_mesh_geometry_get_faces) Gets the faces of the mesh. [`ar_mesh_geometry_get_normals`](/documentation/ARKit/ar_mesh_geometry_get_normals) Gets the normals of the mesh. [`ar_mesh_geometry_get_vertices`](/documentation/ARKit/ar_mesh_geometry_get_vertices) Gets the vertices of the mesh. [`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. [`ar_scene_reconstruction_update_handler_t`](/documentation/ARKit/ar_scene_reconstruction_update_handler_t) A handler for receiving updates to mesh anchors. [`ar_scene_reconstruction_update_handler_function_t`](/documentation/ARKit/ar_scene_reconstruction_update_handler_function_t) ### Hand tracking [`ar_hand_chirality_t`](/documentation/ARKit/ar_hand_chirality_t) The values identifying hand chirality. [`ar_hand_anchor_create`](/documentation/ARKit/ar_hand_anchor_create) Creates a hand anchor. [`ar_hand_anchor_get_chirality`](/documentation/ARKit/ar_hand_anchor_get_chirality) Gets the value that indicates whether the hand is a left or right hand. [`ar_hand_anchor_get_fidelity`](/documentation/ARKit/ar_hand_anchor_get_fidelity) Get the fidelity of the hand anchor. [`ar_hand_anchor_get_origin_from_anchor_transform_with_correction`](/documentation/ARKit/ar_hand_anchor_get_origin_from_anchor_transform_with_correction) Get the transform from an anchor to the origin coordinate system. [`ar_hand_tracking_configuration_t`](/documentation/ARKit/ar_hand_tracking_configuration_t) [`ar_hand_tracking_provider_create`](/documentation/ARKit/ar_hand_tracking_provider_create) A source of live data about the position of a person’s hands and hand joints. [`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. [`ar_hand_tracking_provider_get_latest_anchors`](/documentation/ARKit/ar_hand_tracking_provider_get_latest_anchors) Fetches the most recent hand anchors for each hand. [`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. [`ar_hand_tracking_configuration_create`](/documentation/ARKit/ar_hand_tracking_configuration_create) [`ar_hand_tracking_provider_set_update_handler`](/documentation/ARKit/ar_hand_tracking_provider_set_update_handler) Sets the handler for receiving hand tracking updates. [`ar_hand_tracking_provider_set_update_handler_f`](/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. [`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. [`ar_hand_tracking_update_handler_t`](/documentation/ARKit/ar_hand_tracking_update_handler_t) A handler for receiving updates to hand anchors. [`ar_hand_tracking_update_handler_function_t`](/documentation/ARKit/ar_hand_tracking_update_handler_function_t) [`ar_hand_fidelity_t`](/documentation/ARKit/ar_hand_fidelity_t) Enum for hand fidelity. ### Image tracking [`ar_image_anchor_get_estimated_scale_factor`](/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. [`ar_image_anchor_get_reference_image`](/documentation/ARKit/ar_image_anchor_get_reference_image) Gets the reference image that this image anchor tracks. [`ar_image_anchors_enumerate_anchors`](/documentation/ARKit/ar_image_anchors_enumerate_anchors) Enumerates a collection of image anchors. [`ar_image_anchors_enumerate_anchors_f`](/documentation/ARKit/ar_image_anchors_enumerate_anchors_f) Enumerates a collection of image anchors. [`ar_image_anchors_get_count`](/documentation/ARKit/ar_image_anchors_get_count) Gets the number of image anchors in the collection. [`ar_image_tracking_provider_create`](/documentation/ARKit/ar_image_tracking_provider_create) Creates an image tracking provider that tracks the reference images you supply. [`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. [`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. [`ar_image_tracking_provider_set_update_handler`](/documentation/ARKit/ar_image_tracking_provider_set_update_handler) Sets the handler for receiving image tracking updates. [`ar_image_tracking_provider_set_update_handler_f`](/documentation/ARKit/ar_image_tracking_provider_set_update_handler_f) Sets the handler for receiving image tracking updates. [`ar_image_tracking_configuration_add_reference_images`](/documentation/ARKit/ar_image_tracking_configuration_add_reference_images) Adds reference images to the set to be tracked. [`ar_image_tracking_configuration_create`](/documentation/ARKit/ar_image_tracking_configuration_create) Creates an image tracking configuration. [`ar_image_tracking_configuration_t`](/documentation/ARKit/ar_image_tracking_configuration_t) [`ar_image_tracking_provider_copy_all_image_anchors`](/documentation/ARKit/ar_image_tracking_provider_copy_all_image_anchors) [`ar_reference_images_t`](/documentation/ARKit/ar_reference_images_t) A collection of reference images. [`ar_reference_images_enumerator_t`](/documentation/ARKit/ar_reference_images_enumerator_t) A handler for enumerating a collection of reference images. [`ar_reference_images_add_image`](/documentation/ARKit/ar_reference_images_add_image) Adds a reference image to a collection. [`ar_reference_images_add_images`](/documentation/ARKit/ar_reference_images_add_images) Adds multiple reference images to a collection. [`ar_reference_images_create`](/documentation/ARKit/ar_reference_images_create) Creates an empty collection of reference images. [`ar_reference_images_enumerate_images`](/documentation/ARKit/ar_reference_images_enumerate_images) Enumerates a collection of reference images. [`ar_reference_images_enumerate_images_f`](/documentation/ARKit/ar_reference_images_enumerate_images_f) Enumerates a collection of reference images. [`ar_reference_images_get_count`](/documentation/ARKit/ar_reference_images_get_count) Gets the number of reference images in a collection. [`ar_reference_images_load_reference_images_in_group`](/documentation/ARKit/ar_reference_images_load_reference_images_in_group) Creates multiple reference images based on their group name in an asset catalog. [`ar_reference_image_create_from_cgimage`](/documentation/ARKit/ar_reference_image_create_from_cgimage) Creates a reference image from a Core Graphics image. [`ar_reference_image_create_from_pixel_buffer`](/documentation/ARKit/ar_reference_image_create_from_pixel_buffer) Creates a reference image from a pixel buffer. [`ar_reference_image_get_name`](/documentation/ARKit/ar_reference_image_get_name) Gets the name of a reference image. [`ar_reference_image_set_name`](/documentation/ARKit/ar_reference_image_set_name) Sets the name of a reference image. [`ar_reference_image_get_physical_height`](/documentation/ARKit/ar_reference_image_get_physical_height) Gets the height, in meters, of a reference image in the real world. [`ar_reference_image_get_physical_width`](/documentation/ARKit/ar_reference_image_get_physical_width) Gets the height, in meters, of a reference image in the real world. [`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. [`ar_image_tracking_update_handler_t`](/documentation/ARKit/ar_image_tracking_update_handler_t) A handler for receiving updates to image anchors. [`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. [`ar_image_anchors_enumerator_function_t`](/documentation/ARKit/ar_image_anchors_enumerator_function_t) [`ar_image_tracking_update_handler_function_t`](/documentation/ARKit/ar_image_tracking_update_handler_function_t) [`ar_reference_images_enumerator_function_t`](/documentation/ARKit/ar_reference_images_enumerator_function_t) [`ar_image_anchor_get_origin_from_anchor_transform_with_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 [`ar_accessories_enumerator_function_t`](/documentation/ARKit/ar_accessories_enumerator_function_t) Function for enumerating a collection of accessories. [`ar_accessories_enumerator_t`](/documentation/ARKit/ar_accessories_enumerator_t) Handler for enumerating a collection of accessories. [`ar_accessories_t`](/documentation/ARKit/ar_accessories_t) A collection of accessories. [`ar_accessory_anchor_t`](/documentation/ARKit/ar_accessory_anchor_t) An anchor that represents an accessory. [`ar_accessory_anchors_enumerator_function_t`](/documentation/ARKit/ar_accessory_anchors_enumerator_function_t) Function for enumerating a collection of accessory anchors. [`ar_accessory_anchors_enumerator_t`](/documentation/ARKit/ar_accessory_anchors_enumerator_t) Handler for enumerating a collection of accessory anchors. [`ar_accessory_anchors_t`](/documentation/ARKit/ar_accessory_anchors_t) A collection of accessory anchors. [`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. [`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. [`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. [`ar_accessory_tracking_configuration_t`](/documentation/ARKit/ar_accessory_tracking_configuration_t) Configuration for accessory tracking. [`ar_accessory_tracking_provider_t`](/documentation/ARKit/ar_accessory_tracking_provider_t) A data provider for accessory tracking. [`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. [`ar_accessory_tracking_update_handler_t`](/documentation/ARKit/ar_accessory_tracking_update_handler_t) Handler called when there are updates to accessory anchors. [`ar_accessory_location_name_aim`](/documentation/ARKit/ar_accessory_location_name_aim) Pre-defined accessory location name for spatial gamepad and stylus aim point. [`ar_accessory_location_name_grip`](/documentation/ARKit/ar_accessory_location_name_grip) Pre-defined accessory location name for spatial gamepad grip. [`ar_accessory_location_name_grip_surface`](/documentation/ARKit/ar_accessory_location_name_grip_surface) Pre-defined accessory location name for spatial gamepad grip surface. [`ar_accessories_add_accessories`](/documentation/ARKit/ar_accessories_add_accessories) Add accessories to a collection. [`ar_accessories_add_accessory`](/documentation/ARKit/ar_accessories_add_accessory) Add an accessory to a collection. [`ar_accessories_create`](/documentation/ARKit/ar_accessories_create) Create an empty collection of accessories. [`ar_accessories_enumerate_accessories`](/documentation/ARKit/ar_accessories_enumerate_accessories) Enumerate a collection of accessories. [`ar_accessories_enumerate_accessories_f`](/documentation/ARKit/ar_accessories_enumerate_accessories_f) Enumerate a collection of reference objects. [`ar_accessories_get_count`](/documentation/ARKit/ar_accessories_get_count) Get the count of accessories in the collection. [`ar_accessories_remove_accessory`](/documentation/ARKit/ar_accessories_remove_accessory) Remove an accessory from a collection. [`ar_accessories_remove_accessories`](/documentation/ARKit/ar_accessories_remove_accessories) Remove accessories from a collection. [`ar_accessory_anchor_create`](/documentation/ARKit/ar_accessory_anchor_create) Create an uninitialized accessory anchor. [`ar_accessory_anchor_get_accessory`](/documentation/ARKit/ar_accessory_anchor_get_accessory) Returns the accessory that is being tracked by the anchor. [`ar_accessory_anchor_get_anchor_from_location_transform_with_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. [`ar_accessory_anchor_get_angular_velocity`](/documentation/ARKit/ar_accessory_anchor_get_angular_velocity) Get the estimated angular velocity of the accessory in the local coordinate system. [`ar_accessory_anchor_get_held_chirality`](/documentation/ARKit/ar_accessory_anchor_get_held_chirality) Get the held state of this accessory anchor. [`ar_accessory_anchor_get_identifier`](/documentation/ARKit/ar_accessory_anchor_get_identifier) Get the identifier of an anchor. [`ar_accessory_anchor_get_origin_from_anchor_transform`](/documentation/ARKit/ar_accessory_anchor_get_origin_from_anchor_transform) Get the transform from an anchor to the origin coordinate system. [`ar_accessory_anchor_get_origin_from_anchor_transform_with_correction`](/documentation/ARKit/ar_accessory_anchor_get_origin_from_anchor_transform_with_correction) Get the transform from an anchor to the origin coordinate system. [`ar_accessory_anchor_get_timestamp`](/documentation/ARKit/ar_accessory_anchor_get_timestamp) Get the timestamp corresponding to the accessory anchor. [`ar_accessory_anchor_get_tracking_state`](/documentation/ARKit/ar_accessory_anchor_get_tracking_state) Get the tracking state of the accessory anchor. [`ar_accessory_anchor_get_velocity`](/documentation/ARKit/ar_accessory_anchor_get_velocity) Get the estimated velocity of the accessory in the local coordinate system. [`ar_accessory_anchor_is_equal_to_accessory_anchor`](/documentation/ARKit/ar_accessory_anchor_is_equal_to_accessory_anchor) Returns a Boolean value that indicates whether the two accessory anchors are equal. [`ar_accessory_anchor_is_held`](/documentation/ARKit/ar_accessory_anchor_is_held) Returns a Boolean value that indicates whether the accessory is held. [`ar_accessory_anchor_is_tracked`](/documentation/ARKit/ar_accessory_anchor_is_tracked) Determine whether an accessory anchor is tracked. [`ar_accessory_anchors_enumerate_anchors`](/documentation/ARKit/ar_accessory_anchors_enumerate_anchors) Enumerate a collection of accessory anchors. [`ar_accessory_anchors_enumerate_anchors_f`](/documentation/ARKit/ar_accessory_anchors_enumerate_anchors_f) Enumerate a collection of acessory anchors. [`ar_accessory_anchors_get_count`](/documentation/ARKit/ar_accessory_anchors_get_count) Get the count of accessory anchors in the collection. [`ar_accessory_copy_location_names`](/documentation/ARKit/ar_accessory_copy_location_names) Gets the names of locations with pre-defined coordinate systems available for this accessory. [`ar_accessory_get_identifier`](/documentation/ARKit/ar_accessory_get_identifier) Get identifier for the accessory. [`ar_accessory_get_inherent_chirality`](/documentation/ARKit/ar_accessory_get_inherent_chirality) Get inherent chirality for the accessory (what hand it is designed to be held in). [`ar_accessory_get_name`](/documentation/ARKit/ar_accessory_get_name) Get an accessory’s name. [`ar_accessory_get_source_device`](/documentation/ARKit/ar_accessory_get_source_device) Gets the `GCDevice` that was used to initialize the accessory. [`ar_accessory_get_source_type`](/documentation/ARKit/ar_accessory_get_source_type) Gets type of source that was used to load an accessory. [`ar_accessory_get_usdz_file_path`](/documentation/ARKit/ar_accessory_get_usdz_file_path) Get path to a USDZ file for the accessory, if it has one. [`ar_accessory_is_equal_to_accessory`](/documentation/ARKit/ar_accessory_is_equal_to_accessory) Indicates whether two accessories are equal. [`ar_accessory_load_from_device`](/documentation/ARKit/ar_accessory_load_from_device) Load an accessory from a `GCDevice`. [`ar_accessory_load_from_device_f`](/documentation/ARKit/ar_accessory_load_from_device_f) Load an accessory from a `GCDevice`. [`ar_accessory_tracking_configuration_create`](/documentation/ARKit/ar_accessory_tracking_configuration_create) Create an accessory tracking configuration. [`ar_accessory_tracking_configuration_set_accessories`](/documentation/ARKit/ar_accessory_tracking_configuration_set_accessories) Set accessories to track for the configuration. [`ar_accessory_tracking_provider_create`](/documentation/ARKit/ar_accessory_tracking_provider_create) Create an accessory tracking provider. [`ar_accessory_tracking_provider_get_latest_anchors`](/documentation/ARKit/ar_accessory_tracking_provider_get_latest_anchors) Retrieves the latest anchors updated with the most recent inertial data. [`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. [`ar_accessory_tracking_provider_is_supported`](/documentation/ARKit/ar_accessory_tracking_provider_is_supported) Determines whether this device supports the accessory tracking provider. [`ar_accessory_tracking_provider_predict_anchor_at_timestamp`](/documentation/ARKit/ar_accessory_tracking_provider_predict_anchor_at_timestamp) Predict an accessory anchor to a target timestamp. [`ar_accessory_tracking_provider_set_update_handler`](/documentation/ARKit/ar_accessory_tracking_provider_set_update_handler) Set the handler for receiving accessory anchor updates. [`ar_accessory_tracking_provider_set_update_handler_f`](/documentation/ARKit/ar_accessory_tracking_provider_set_update_handler_f) Set the function for receiving accessory tracking updates. [`ar_accessory_tracking_provider_update_accessories`](/documentation/ARKit/ar_accessory_tracking_provider_update_accessories) Update the accessories being tracked by a provider. [`ar_accessory_tracking_provider_update_accessories_f`](/documentation/ARKit/ar_accessory_tracking_provider_update_accessories_f) Update the accessories being tracked by a provider. [`ar_accessory_anchor_tracking_state_t`](/documentation/ARKit/ar_accessory_anchor_tracking_state_t) Tracking status for accessory anchors. [`ar_accessory_chirality_t`](/documentation/ARKit/ar_accessory_chirality_t) The chirality of an accessory. [`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`. [`ar_accessory_tracking_error_code_t`](/documentation/ARKit/ar_accessory_tracking_error_code_t) Error codes specific to accessory tracking. [`ar_transform_correction_t`](/documentation/ARKit/ar_transform_correction_t) A correction type to apply for transforms returned from ARKit APIs. [`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. [`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 [`ar_camera_frame_sample_enumerator_function_t`](/documentation/ARKit/ar_camera_frame_sample_enumerator_function_t) Function for enumerating camera frame samples. [`ar_camera_frame_sample_enumerator_t`](/documentation/ARKit/ar_camera_frame_sample_enumerator_t) Handler for enumerating camera frame samples. [`ar_camera_frame_samples_t`](/documentation/ARKit/ar_camera_frame_samples_t) A collection of camera frame samples. [`ar_camera_frame_get_frame_samples`](/documentation/ARKit/ar_camera_frame_get_frame_samples) Get the collection of camera frame samples for this camera frame. [`ar_camera_frame_samples_enumerate_frame_samples`](/documentation/ARKit/ar_camera_frame_samples_enumerate_frame_samples) Enumerate all camera frame samples in this collection. [`ar_camera_frame_samples_enumerate_frame_samples_f`](/documentation/ARKit/ar_camera_frame_samples_enumerate_frame_samples_f) Enumerate all supported camera frame samples for this configuration using a function. [`ar_camera_frame_samples_get_count`](/documentation/ARKit/ar_camera_frame_samples_get_count) Get the count of camera frame samples in the collection. [`ar_camera_video_format_get_camera_rectification_type`](/documentation/ARKit/ar_camera_video_format_get_camera_rectification_type) Get the camera rectification type for this video format. [`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 [`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). [`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). [`ar_camera_region_anchor_t`](/documentation/ARKit/ar_camera_region_anchor_t) An anchor representing a camera region with enhanced image processing. [`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. [`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. [`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. [`ar_camera_region_anchors_enumerator_t`](/documentation/ARKit/ar_camera_region_anchors_enumerator_t) Handler for enumerating a collection of camera region anchors. [`ar_camera_region_anchors_t`](/documentation/ARKit/ar_camera_region_anchors_t) A collection of camera region anchors. [`ar_camera_region_configuration_t`](/documentation/ARKit/ar_camera_region_configuration_t) Configuration for camera region processing. [`ar_camera_region_provider_t`](/documentation/ARKit/ar_camera_region_provider_t) A data provider for camera region processing. [`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). [`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). [`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). [`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). [`ar_camera_region_anchor_create_with_parameters`](/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. [`ar_camera_region_anchor_get_camera_enhancement`](/documentation/ARKit/ar_camera_region_anchor_get_camera_enhancement) Get the camera enhancement type for a given anchor. [`ar_camera_region_anchor_get_height`](/documentation/ARKit/ar_camera_region_anchor_get_height) Get the height of a given anchor. [`ar_camera_region_anchor_get_identifier`](/documentation/ARKit/ar_camera_region_anchor_get_identifier) Get the identifier of an anchor. [`ar_camera_region_anchor_get_origin_from_anchor_transform`](/documentation/ARKit/ar_camera_region_anchor_get_origin_from_anchor_transform) Get the transform from an anchor to the origin coordinate system. [`ar_camera_region_anchor_get_pixel_buffer`](/documentation/ARKit/ar_camera_region_anchor_get_pixel_buffer) Get the `CVPixelBufferRef` for this anchor. [`ar_camera_region_anchor_get_timestamp`](/documentation/ARKit/ar_camera_region_anchor_get_timestamp) Get the timestamp corresponding to an anchor. [`ar_camera_region_anchor_get_width`](/documentation/ARKit/ar_camera_region_anchor_get_width) Get the width of a given anchor. [`ar_camera_region_anchor_is_equal_to_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. [`ar_camera_region_anchors_enumerate_anchors`](/documentation/ARKit/ar_camera_region_anchors_enumerate_anchors) Enumerate a collection of camera region anchors. [`ar_camera_region_anchors_enumerate_anchors_f`](/documentation/ARKit/ar_camera_region_anchors_enumerate_anchors_f) Enumerate a collection of camera region anchors using a function. [`ar_camera_region_anchors_get_count`](/documentation/ARKit/ar_camera_region_anchors_get_count) Get the count of camera region anchors in a collection. [`ar_camera_region_configuration_create`](/documentation/ARKit/ar_camera_region_configuration_create) Create a camera region configuration. [`ar_camera_region_provider_add_camera_region_anchor`](/documentation/ARKit/ar_camera_region_provider_add_camera_region_anchor) Add a camera region anchor to a camera region provider. [`ar_camera_region_provider_add_camera_region_anchor_f`](/documentation/ARKit/ar_camera_region_provider_add_camera_region_anchor_f) Add a camera region anchor to an camera region provider using a function. [`ar_camera_region_provider_create`](/documentation/ARKit/ar_camera_region_provider_create) Create a camera region provider. [`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. [`ar_camera_region_provider_is_supported`](/documentation/ARKit/ar_camera_region_provider_is_supported) Determine whether this device supports the camera region provider. [`ar_camera_region_provider_remove_camera_region_anchor`](/documentation/ARKit/ar_camera_region_provider_remove_camera_region_anchor) Remove a camera region anchor from a camera region provider. [`ar_camera_region_provider_remove_camera_region_anchor_f`](/documentation/ARKit/ar_camera_region_provider_remove_camera_region_anchor_f) Remove a camera region anchor from a camera region provider using a function. [`ar_camera_region_provider_remove_camera_region_anchor_with_identifier`](/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. [`ar_camera_region_provider_remove_camera_region_anchor_with_identifier_f`](/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. [`ar_camera_region_provider_set_update_handler_for_anchor_with_identifier`](/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. [`ar_camera_region_provider_set_update_handler_for_anchor_with_identifier_f`](/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. [`ar_camera_region_camera_enhancement_t`](/documentation/ARKit/ar_camera_region_camera_enhancement_t) Enum describing camera enhancement types. [`ar_camera_region_error_code_t`](/documentation/ARKit/ar_camera_region_error_code_t) Error codes specific to the camera region provider. [`ar_camera_region_anchor_get_origin_from_anchor_transform_with_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 [`ar_coordinate_space_data_t`](/documentation/ARKit/ar_coordinate_space_data_t) Data for sharing coordinate space information between participants. [`ar_coordinate_space_data_copy_cfdata`](/documentation/ARKit/ar_coordinate_space_data_copy_cfdata) Copy out a `CFDataRef` that archives the coordinate space data. [`ar_coordinate_space_data_copy_recipient_identifers`](/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. [`ar_coordinate_space_data_create_from_cfdata`](/documentation/ARKit/ar_coordinate_space_data_create_from_cfdata) Create and initialize an `ar_coordinate_space_data_t` object from a `CFDataRef`. [`ar_coordinate_space_data_copy_recipient_identifiers`](/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 [`ar_shared_coordinate_space_configuration_t`](/documentation/ARKit/ar_shared_coordinate_space_configuration_t) Configuration for the shared coordinate space provider. [`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. [`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. [`ar_shared_coordinate_space_provider_t`](/documentation/ARKit/ar_shared_coordinate_space_provider_t) A data provider for shared coordinate spaces across participants. [`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. [`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. [`ar_shared_coordinate_provider_set_connected_participants_update_handler_f`](/documentation/ARKit/ar_shared_coordinate_provider_set_connected_participants_update_handler_f) Set the function for receiving shared coordinate space connected participants updates. [`ar_shared_coordinate_space_configuration_create`](/documentation/ARKit/ar_shared_coordinate_space_configuration_create) Create a shared coordinate space configuration. [`ar_shared_coordinate_space_provider_copy_next_coordinate_space_data`](/documentation/ARKit/ar_shared_coordinate_space_provider_copy_next_coordinate_space_data) Copy the next collaboration data. [`ar_shared_coordinate_space_provider_create`](/documentation/ARKit/ar_shared_coordinate_space_provider_create) Create a shared coordinate space provider. [`ar_shared_coordinate_space_provider_get_participant_identifier`](/documentation/ARKit/ar_shared_coordinate_space_provider_get_participant_identifier) Get the identifier used to identify the participant in the shared coordinate space. [`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. [`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. [`ar_shared_coordinate_space_provider_push_data`](/documentation/ARKit/ar_shared_coordinate_space_provider_push_data) Push data to the shared coordinate space provider. [`ar_shared_coordinate_space_provider_set_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. [`ar_shared_coordinate_space_provider_set_sharing_status_update_handler`](/documentation/ARKit/ar_shared_coordinate_space_provider_set_sharing_status_update_handler) Set the handler for receiving sharing status updates. [`ar_shared_coordinate_space_provider_set_sharing_status_update_handler_f`](/documentation/ARKit/ar_shared_coordinate_space_provider_set_sharing_status_update_handler_f) Set the function for receiving sharing status updates. [`ar_shared_coordinate_space_provider_is_sharing_enabled`](/documentation/ARKit/ar_shared_coordinate_space_provider_is_sharing_enabled) Get the latest sharing status. ### Rendering [`ar_stereo_properties_configuration_t`](/documentation/ARKit/ar_stereo_properties_configuration_t) Configuration for the stereo properties provider. [`ar_stereo_properties_provider_t`](/documentation/ARKit/ar_stereo_properties_provider_t) A data provider that provides stereo viewpoint properties. [`ar_stereo_properties_configuration_create`](/documentation/ARKit/ar_stereo_properties_configuration_create) Create a stereo properties configuration object. [`ar_stereo_properties_provider_create`](/documentation/ARKit/ar_stereo_properties_provider_create) Create a stereo properties provider. [`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. [`ar_stereo_properties_provider_get_viewpoint_properties`](/documentation/ARKit/ar_stereo_properties_provider_get_viewpoint_properties) Returns the latest viewpoint properties. [`ar_stereo_properties_provider_is_supported`](/documentation/ARKit/ar_stereo_properties_provider_is_supported) Determines whether this device supports the stereo properties provider. [`ar_viewpoint_properties_create`](/documentation/ARKit/ar_viewpoint_properties_create) Create an `ar_viewpoint_properties_t`. [`ar_viewpoint_properties_get_device_from_left_viewpoint_transform`](/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. [`ar_viewpoint_properties_get_device_from_right_viewpoint_transform`](/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. [`ar_viewpoint_properties_t`](/documentation/ARKit/ar_viewpoint_properties_t) Properties describing the stereo viewpoints of the device. ### Visual fidelity [`ar_polygon_points_add_point`](/documentation/ARKit/ar_polygon_points_add_point) Adds a single point to the polygon points collection. [`ar_polygon_points_add_points`](/documentation/ARKit/ar_polygon_points_add_points) Adds multiple points to the polygon points collection. [`ar_polygon_points_create`](/documentation/ARKit/ar_polygon_points_create) Creates a new empty polygon points collection. [`ar_polygon_points_get_count`](/documentation/ARKit/ar_polygon_points_get_count) Gets the number of points in the collection. [`ar_polygon_points_get_point_at_index`](/documentation/ARKit/ar_polygon_points_get_point_at_index) Gets a point at a specific index. [`ar_polygon_points_is_equal_to_polygon_points`](/documentation/ARKit/ar_polygon_points_is_equal_to_polygon_points) Check if two polygon points collections are equal. [`ar_polygon_points_t`](/documentation/ARKit/ar_polygon_points_t) A collection of 2D polygon points. [`ar_reference_object_configuration_t`](/documentation/ARKit/ar_reference_object_configuration_t) Defines a configuration for an individual reference object. [`ar_field_of_view_anchor_get_identifier`](/documentation/ARKit/ar_field_of_view_anchor_get_identifier) Get the identifier of the field of view anchor. [`ar_field_of_view_anchor_get_left_polygon_points`](/documentation/ARKit/ar_field_of_view_anchor_get_left_polygon_points) Get the left eye polygon boundary points defining the preset FoV. [`ar_field_of_view_anchor_get_origin_from_anchor_transform`](/documentation/ARKit/ar_field_of_view_anchor_get_origin_from_anchor_transform) Get the transform from the anchor to the origin coordinate system. [`ar_field_of_view_anchor_get_origin_from_anchor_transform_with_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. [`ar_field_of_view_anchor_get_right_polygon_points`](/documentation/ARKit/ar_field_of_view_anchor_get_right_polygon_points) Get the right eye polygon boundary points defining the preset FoV. [`ar_field_of_view_anchor_get_timestamp`](/documentation/ARKit/ar_field_of_view_anchor_get_timestamp) Get the timestamp of the field of view anchor. [`ar_field_of_view_anchor_is_equal_to_field_of_view_anchor`](/documentation/ARKit/ar_field_of_view_anchor_is_equal_to_field_of_view_anchor) Check if two field of view anchors are equal. [`ar_field_of_view_create_polygon`](/documentation/ARKit/ar_field_of_view_create_polygon) Create a polygon-based field of view. [`ar_field_of_view_create_preset_a`](/documentation/ARKit/ar_field_of_view_create_preset_a) Create a preset field of view A. [`ar_field_of_view_create_preset_b`](/documentation/ARKit/ar_field_of_view_create_preset_b) Create a preset field of view B. [`ar_field_of_view_create_preset_c`](/documentation/ARKit/ar_field_of_view_create_preset_c) Create a preset field of view C. [`ar_field_of_view_create_preset_d`](/documentation/ARKit/ar_field_of_view_create_preset_d) Create a preset field of view D. [`ar_field_of_view_is_valid`](/documentation/ARKit/ar_field_of_view_is_valid) Validate whether a field of view specification is valid. [`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. [`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. [`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. [`ar_field_of_view_t`](/documentation/ARKit/ar_field_of_view_t) Field of view specification. [`ar_visual_fidelity_configuration_t`](/documentation/ARKit/ar_visual_fidelity_configuration_t) Configuration object for visual fidelity monitoring. [`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. [`ar_visual_fidelity_provider_t`](/documentation/ARKit/ar_visual_fidelity_provider_t) Data provider for visual fidelity monitoring. [`ar_visual_fidelity_update_handler_function_t`](/documentation/ARKit/ar_visual_fidelity_update_handler_function_t) Function called when visual fidelity data is updated. [`ar_visual_fidelity_update_handler_t`](/documentation/ARKit/ar_visual_fidelity_update_handler_t) Handler called when visual fidelity data is updated. [`ar_visual_fidelity_configuration_create`](/documentation/ARKit/ar_visual_fidelity_configuration_create) Create a visual fidelity configuration. [`ar_visual_fidelity_configuration_set_field_of_view`](/documentation/ARKit/ar_visual_fidelity_configuration_set_field_of_view) Set the field of view specification to monitor. [`ar_visual_fidelity_configuration_set_present_coaching_alerts`](/documentation/ARKit/ar_visual_fidelity_configuration_set_present_coaching_alerts) Request whether coaching alerts should be automatically presented to the user. [`ar_visual_fidelity_configuration_set_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. [`ar_visual_fidelity_data_get_device_fit_status`](/documentation/ARKit/ar_visual_fidelity_data_get_device_fit_status) Get the device fit validation status. [`ar_visual_fidelity_data_is_equal_to_visual_fidelity_data`](/documentation/ARKit/ar_visual_fidelity_data_is_equal_to_visual_fidelity_data) Check if two visual fidelity data instances are equal. [`ar_visual_fidelity_data_get_timestamp`](/documentation/ARKit/ar_visual_fidelity_data_get_timestamp) Get the timestamp when this validation data was captured. [`ar_visual_fidelity_data_is_field_of_view_valid`](/documentation/ARKit/ar_visual_fidelity_data_is_field_of_view_valid) Check if the field of view is valid. [`ar_visual_fidelity_data_is_equal_to_visual_fidelity_data`](/documentation/ARKit/ar_visual_fidelity_data_is_equal_to_visual_fidelity_data) Check if two visual fidelity data instances are equal. [`ar_visual_fidelity_provider_create`](/documentation/ARKit/ar_visual_fidelity_provider_create) Create a visual fidelity data provider. [`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. [`ar_visual_fidelity_provider_is_supported`](/documentation/ARKit/ar_visual_fidelity_provider_is_supported) Determine whether this device supports the visual fidelity data provider. [`ar_visual_fidelity_provider_set_anchor_update_handler`](/documentation/ARKit/ar_visual_fidelity_provider_set_anchor_update_handler) Set the handler for receiving field of view anchor updates. [`ar_visual_fidelity_provider_set_anchor_update_handler_f`](/documentation/ARKit/ar_visual_fidelity_provider_set_anchor_update_handler_f) Set the function for receiving field of view anchor updates. [`ar_visual_fidelity_provider_set_update_handler`](/documentation/ARKit/ar_visual_fidelity_provider_set_update_handler) Set the handler for receiving visual fidelity data updates. [`ar_visual_fidelity_provider_set_update_handler_f`](/documentation/ARKit/ar_visual_fidelity_provider_set_update_handler_f) Set the function for receiving visual fidelity data updates. [`ar_device_fit_status_t`](/documentation/ARKit/ar_device_fit_status_t) Device fit validation status. ### Object tracking [`ar_object_tracking_provider_create`](/documentation/ARKit/ar_object_tracking_provider_create) [`ar_object_tracking_provider_copy_all_object_anchors`](/documentation/ARKit/ar_object_tracking_provider_copy_all_object_anchors) [`ar_object_tracking_provider_get_required_authorization_type`](/documentation/ARKit/ar_object_tracking_provider_get_required_authorization_type) [`ar_object_tracking_provider_is_supported`](/documentation/ARKit/ar_object_tracking_provider_is_supported) [`ar_object_tracking_provider_set_update_handler`](/documentation/ARKit/ar_object_tracking_provider_set_update_handler) [`ar_object_tracking_provider_set_update_handler_f`](/documentation/ARKit/ar_object_tracking_provider_set_update_handler_f) [`ar_object_tracking_error_code_t`](/documentation/ARKit/ar_object_tracking_error_code_t) An enumeration that describes object tracking errors. [`ar_reference_object_configuration_create`](/documentation/ARKit/ar_reference_object_configuration_create) Create a reference object configuration. [`ar_reference_object_configuration_enable_high_frame_rate_tracking`](/documentation/ARKit/ar_reference_object_configuration_enable_high_frame_rate_tracking) Sets whether high-frame-rate tracking is enabled on this configuration. [`ar_reference_object_configuration_is_equal_to_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. [`ar_reference_object_configuration_is_high_frame_rate_tracking_enabled`](/documentation/ARKit/ar_reference_object_configuration_is_high_frame_rate_tracking_enabled) Checks whether high-frame-rate tracking is enabled on this configuration. [`ar_reference_object_load_from_url_with_configuration`](/documentation/ARKit/ar_reference_object_load_from_url_with_configuration) Load a reference object from a URL. [`ar_reference_object_load_from_url_with_configuration_f`](/documentation/ARKit/ar_reference_object_load_from_url_with_configuration_f) Load a reference object from a URL. [`ar_reference_object_load_with_name_and_configuration`](/documentation/ARKit/ar_reference_object_load_with_name_and_configuration) Load a reference object from a bundle. [`ar_reference_object_load_with_name_and_configuration_f`](/documentation/ARKit/ar_reference_object_load_with_name_and_configuration_f) Load a reference object from a bundle. [`ar_reference_object_load_from_url`](/documentation/ARKit/ar_reference_object_load_from_url) [`ar_reference_object_load_from_url_f`](/documentation/ARKit/ar_reference_object_load_from_url_f) [`ar_reference_object_load_with_name`](/documentation/ARKit/ar_reference_object_load_with_name) [`ar_reference_object_load_with_name_f`](/documentation/ARKit/ar_reference_object_load_with_name_f) [`ar_reference_objects_add_object`](/documentation/ARKit/ar_reference_objects_add_object) [`ar_reference_objects_add_objects`](/documentation/ARKit/ar_reference_objects_add_objects) [`ar_reference_objects_create`](/documentation/ARKit/ar_reference_objects_create) [`ar_reference_objects_enumerate_objects`](/documentation/ARKit/ar_reference_objects_enumerate_objects) [`ar_reference_objects_enumerate_objects_f`](/documentation/ARKit/ar_reference_objects_enumerate_objects_f) [`ar_reference_objects_get_count`](/documentation/ARKit/ar_reference_objects_get_count) ### Strings [`ar_strings_enumerator_function_t`](/documentation/ARKit/ar_strings_enumerator_function_t) Function for enumerating a collection of strings. [`ar_strings_enumerator_t`](/documentation/ARKit/ar_strings_enumerator_t) Handler for enumerating a collection of strings. [`ar_strings_t`](/documentation/ARKit/ar_strings_t) A collection of strings. [`ar_strings_enumerate_strings`](/documentation/ARKit/ar_strings_enumerate_strings) Enumerate a collection of strings. [`ar_strings_enumerate_strings_f`](/documentation/ARKit/ar_strings_enumerate_strings_f) Enumerate a collection of strings using a function. [`ar_strings_get_count`](/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 [`ar_error_t`](/documentation/ARKit/ar_error_t) An error reported by ARKit. [`ar_error_code_t`](/documentation/ARKit/ar_error_code_t) Codes that identify errors in ARKit. [`ar_error_domain`](/documentation/ARKit/ar_error_domain) A string that indicates the error domain in Core Foundation. [`ar_error_get_error_code`](/documentation/ARKit/ar_error_get_error_code) Gets the error code associated with an error. [`ar_error_copy_cf_error`](/documentation/ARKit/ar_error_copy_cf_error) Copies a reference to a Core Foundation error object that represents the specified ARKit error. [`AR_EXTERN_C_BEGIN`](/documentation/ARKit/AR_EXTERN_C_BEGIN) [`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)