C Specification

An application can inspect whether the system is capable of hand tracking meshes by chaining an XrSystemHandTrackingMeshPropertiesMSFT structure to the XrSystemProperties when calling xrGetSystemProperties.

// Provided by XR_MSFT_hand_tracking_mesh
typedef struct XrSystemHandTrackingMeshPropertiesMSFT {
    XrStructureType    type;
    void*              next;
    XrBool32           supportsHandTrackingMesh;
    uint32_t           maxHandMeshIndexCount;
    uint32_t           maxHandMeshVertexCount;
} XrSystemHandTrackingMeshPropertiesMSFT;

Members

Member Descriptions

  • type is the XrStructureType of this structure.

  • next is NULL or a pointer to the next structure in a structure chain. No such structures are defined in core OpenXR or this extension.

  • supportsHandTrackingMesh is an XrBool32, indicating if current system is capable of hand tracking mesh input.

  • maxHandMeshIndexCount is a uint32_t returns the maximum count of indices that will be returned from the hand tracker.

  • maxHandMeshVertexCount is a uint32_t returns the maximum count of vertices that will be returned from the hand tracker.

Description

If a runtime returns XR_FALSE for supportsHandTrackingMesh, the system does not support hand tracking mesh input, and therefore must return XR_ERROR_FEATURE_UNSUPPORTED from xrCreateHandMeshSpaceMSFT and xrUpdateHandMeshMSFT. The application should avoid using hand mesh functionality when supportsHandTrackingMesh is XR_FALSE.

If a runtime returns XR_TRUE for supportsHandTrackingMesh, the system supports hand tracking mesh input. In this case, the runtime must return a positive number for maxHandMeshIndexCount and maxHandMeshVertexCount. An application should use maxHandMeshIndexCount and maxHandMeshVertexCount to preallocate hand mesh buffers and reuse them in their render loop when calling xrUpdateHandMeshMSFT every frame.

Valid Usage (Implicit)

See Also

XR_MSFT_hand_tracking_mesh, XrBool32, XrStructureType, XrSystemProperties, xrGetSystemProperties

Document Notes

For more information, see the OpenXR Specification

This page is extracted from the OpenXR Specification. Fixes and changes should be made to the Specification, not directly.

Copyright

Copyright 2014-2023 The Khronos Group Inc.

This work is licensed under a Creative Commons Attribution 4.0 International License.