I am exteding the Unreal Engines HeadMounted display to integrate our local librarys VR clients position and orientation . I have overloaded the GetCurrentPose and GetRelativeEyePose functions to pass the currentpose and relative eye pose to Unreal Engines callback . So far the rendering seems to be correct when I test it with the Quest Client . But on Hololens I see a shift when I change my position . i.e the objects seem to follow my location rather than staying put on their current location . Also note that we are not using OpenXR and have hooked onto the UE render pipeline to fetch the frame and pass it to our upstream clients . So as in OpenXR where the positions are fetched from the reference XR Space , we direcly get it from our upstream library . If you need any code samples I can provide