I'm currently making some custom mirrors with my own cameras using the eye position and rotation retrieved from the VRCCameraSettings. The mirrors work, but if I have the update loop in PostLateUpdate, the images are clearly lagging behind when I move my head in VR (on desktop it works fine). Using the rotation from the tracking data of the head does seem to have the same issue. I worked around it by updating the transform in OnPreCull instead, but isn't the intention of PostLateUpdate to have all tracking data up to date for the current frame?