C Specification

XrHandTrackingAimStateFB can be provided in the next chain of XrHandJointLocationsEXT when calling xrLocateHandJointsEXT to request aiming gesture information associated with this hand.

The XrHandTrackingAimStateFB structure is defined as:

// Provided by XR_FB_hand_tracking_aim
typedef struct XrHandTrackingAimStateFB {
    XrStructureType             type;
    void*                       next;
    XrHandTrackingAimFlagsFB    status;
    XrPosef                     aimPose;
    float                       pinchStrengthIndex;
    float                       pinchStrengthMiddle;
    float                       pinchStrengthRing;
    float                       pinchStrengthLittle;
} XrHandTrackingAimStateFB;

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.

  • status is a bitmask of XrHandTrackingAimFlagBitsFB describing the availability and state of other signals.

  • aimPose is a system-determined "aim" pose, similar in intent and convention to the aim poses used with the action system, based on hand data.

  • pinchStrengthIndex is the current pinching strength for the index finger of this hand. Range is 0.0 to 1.0, with 1.0 meaning index and thumb are fully touching.

  • pinchStrengthMiddle is the current pinching strength for the middle finger of this hand. Range is 0.0 to 1.0, with 1.0 meaning middle and thumb are fully touching.

  • pinchStrengthRing is the current pinching strength for the ring finger of this hand. Range is 0.0 to 1.0, with 1.0 meaning ring and thumb are fully touching.

  • pinchStrengthLittle is the current pinching strength for the little finger of this hand. Range is 0.0 to 1.0, with 1.0 meaning little and thumb are fully touching.

Description

Valid Usage (Implicit)

See Also

XR_FB_hand_tracking_aim, XrHandTrackingAimFlagsFB, XrPosef, XrStructureType

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.