C Specification

XrFaceExpressionStatusFB structure describes the validity of facial expression weights.

// Provided by XR_FB_face_tracking
typedef struct XrFaceExpressionStatusFB {
    XrBool32    isValid;
    XrBool32    isEyeFollowingBlendshapesValid;
} XrFaceExpressionStatusFB;

Members

Member Descriptions

  • isValid is an XrBool32 which indicates that the tracked expression weights are valid.

  • isEyeFollowingBlendshapesValid is an XrBool32 which indicates if the 8 expression weights with prefix XR_FACE_EXPRESSION_EYES_LOOK_* are valid.

Description

If the returned isValid is XR_FALSE, then it indicates that the face tracker failed to track or lost track of the face, or the application lost focus, or the consent for face tracking was denied.

If the returned isValid is XR_TRUE, the runtime must return all weights (or all weights except eyes related weights, see isEyeFollowingBlendshapesValid).

If the returned isEyeFollowingBlendshapesValid is XR_FALSE, then it indicates that the eye tracking driving blendshapes with prefix XR_FACE_EXPRESSION_EYES_LOOK_* lost track or the consent for eye tracking was denied.

Valid Usage (Implicit)

See Also

XR_FB_face_tracking, XrBool32, XrFaceExpressionWeightsFB

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 2014-2025 The Khronos Group Inc.

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