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Showing content from https://github.com/ValveSoftware/openvr/wiki/IVROverlay::SetOverlayTransformTrackedDeviceRelative below:

IVROverlay::SetOverlayTransformTrackedDeviceRelative · ValveSoftware/openvr Wiki · GitHub

VROverlayError SetOverlayTransformTrackedDeviceRelative( VROverlayHandle_t ulOverlayHandle, TrackedDeviceIndex_t unTrackedDevice, const HmdMatrix34_t *pmatTrackedDeviceToOverlayTransform )

VROverlayError GetOverlayTransformTrackedDeviceRelative( VROverlayHandle_t ulOverlayHandle, TrackedDeviceIndex_t *punTrackedDevice, HmdMatrix34_t *pmatTrackedDeviceToOverlayTransform )

Sets the transform relative to the specified tracked device or gets the existing tracked device relative transform.

• VROverlayHandle_t ulOverlayHandle - Handle of the overlay to interact with
• TrackedDeviceIndex_t unTrackedDevice - Tracked device to move the overlay relative to
• TrackedDeviceIndex_t *punTrackedDevice - Receives tracked device index that the overlay is moving relative to
• HmdMatrix34_t *pmatTrackedDeviceToOverlayTransform - Overlay's transform relative to the tracked device

Description

Use these functions to set up an overlay to move around as a tracked device does. Further transform updates for the overlay will happen automatically as the tracked device moves.

Get will return an error if the transform type is not VROverlayTransform_TrackedDeviceRelative.

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