# HumanBodyPose3DObservation An observation that provides the 3D body points the request recognizes. ``` struct HumanBodyPose3DObservation ``` ## Topics ### Creating an observation [`init(VNHumanBodyPose3DObservation)`](/documentation/Vision/HumanBodyPose3DObservation/init(_:)) Creates a 3D human body pose observation. ### Inspecting an observation [`enum RequestDescriptor`](/documentation/Vision/RequestDescriptor) A type that describes the request and revision combination. [`let bodyHeight: Measurement`](/documentation/Vision/HumanBodyPose3DObservation/bodyHeight) The estimated human body height, in meters. [`let cameraOriginMatrix: simd_float4x4`](/documentation/Vision/HumanBodyPose3DObservation/cameraOriginMatrix) A transform from the skeleton hip to the camera. [`enum EstimationTechnique`](/documentation/Vision/HumanBodyPose3DObservation/EstimationTechnique) Constants that identify body height estimation techniques. [`let heightEstimationTechnique: HumanBodyPose3DObservation.EstimationTechnique`](/documentation/Vision/HumanBodyPose3DObservation/heightEstimationTechnique) The technique the framework uses to estimate body height. ### Getting the joints [`func allJoints(in: HumanBodyPose3DObservation.JointsGroupName?) -> [HumanBodyPose3DObservation.JointName : Joint3D]`](/documentation/Vision/HumanBodyPose3DObservation/allJoints(in:)) Retrieves a dictionary of all joints in a joint group. [`var availableJointsGroupNames: [HumanBodyPose3DObservation.JointsGroupName]`](/documentation/Vision/HumanBodyPose3DObservation/availableJointsGroupNames) The names of the available joint groupings in the observation. [`enum JointsGroupName`](/documentation/Vision/HumanBodyPose3DObservation/JointsGroupName) The supported joint group names for the body pose. [`func joint(for: HumanBodyPose3DObservation.JointName) -> Joint3D?`](/documentation/Vision/HumanBodyPose3DObservation/joint(for:)) Retrieves a joint for a given joint name. [`var availableJointNames: [HumanBodyPose3DObservation.JointName]`](/documentation/Vision/HumanBodyPose3DObservation/availableJointNames) The names of the available joints in the observation. [`enum JointName`](/documentation/Vision/HumanBodyPose3DObservation/JointName) The supported joint names for the body pose. ### Getting the joint name [`func parentJointName(for: HumanBodyPose3DObservation.JointName) -> HumanBodyPose3DObservation.JointName`](/documentation/Vision/HumanBodyPose3DObservation/parentJointName(for:)) Returns the parent joint of the joint name you specify. ### Getting the camera position [`func cameraRelativePosition(for: HumanBodyPose3DObservation.JointName) -> simd_float4x4`](/documentation/Vision/HumanBodyPose3DObservation/cameraRelativePosition(for:)) Returns a position relative to the camera for the body joint you specify. ### Getting the joint position [`func pointInImage(for: HumanBodyPose3DObservation.JointName) -> NormalizedPoint`](/documentation/Vision/HumanBodyPose3DObservation/pointInImage(for:)) Returns a 2D point for the joint name you specify, relative to the input image. ## Relationships ### Conforms To [`Copyable`](/documentation/Swift/Copyable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Equatable`](/documentation/Swift/Equatable) [`Decodable`](/documentation/Swift/Decodable) [`Escapable`](/documentation/Swift/Escapable) [`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible) [`VisionObservation`](/documentation/Vision/VisionObservation) [`Encodable`](/documentation/Swift/Encodable) [`Hashable`](/documentation/Swift/Hashable) [`Sendable`](/documentation/Swift/Sendable) --- 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)