XR systems may have limited real world spatial ranges in which users can freely move around while remaining tracked. Applications may wish to query these boundaries and alter application behavior or content placement to ensure the user can complete the experience while remaining within the boundary. Applications can query this information using xrGetReferenceSpaceBoundsRect.
When called, xrGetReferenceSpaceBoundsRect should return the extents
of a rectangle that is clear of obstacles down to the floor, allowing where
the user can freely move while remaining tracked, if available for that
The returned extent represents the dimensions of an axis-aligned bounding
box where the XrExtent2Df::
height fields correspond to the X and Z axes of the
provided space, with the extents centered at the origin of the space.
Not all systems or spaces may support boundaries.
If a runtime is unable to provide bounds for a given space,
XR_SPACE_BOUNDS_UNAVAILABLE will be returned and all fields of
bounds will be set to 0.
The returned extents are expressed relative to the natural origin of the provided XrReferenceSpaceType and must not incorporate any origin offsets specified by the application during calls to xrCreateReferenceSpace.
The runtime must return
XR_ERROR_REFERENCE_SPACE_UNSUPPORTED if the
XrReferenceSpaceType passed in
createInfo is not supported by
When a runtime will begin operating with updated space bounds, the runtime must queue a corresponding XrEventDataReferenceSpaceChangePending event.
XrResult xrGetReferenceSpaceBoundsRect( XrSession session, XrReferenceSpaceType referenceSpaceType, XrExtent2Df* bounds);
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.
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