IVRCompositor::WaitGetPoses

Returns pose(s) to use to render scene.

virtual void WaitGetPoses( VR_ARRAY_COUNT(unPoseArrayCount) TrackedDevicePose_t* pPoseArray, uint32_t unPoseArrayCount ) = 0;

For more information on poses, see IVRSystem::GetDeviceToAbsoluteTrackingPose.

Has the same functionality as the above function, the primary difference however is that WaitGetPoses(...) also sets the caller Application as the focus of the compositor.