@CosmicLobster Hi thanks for the reply.
Does FOV work for you? I am returning a fov the problem is its the fov of before AR, which is no longer accurate at all once an AR session has started. In the example above I was getting FOV every frame.
The reason it is a mesh is it needs to use normals/specular etc.
Ive since realised maybe an easier solution is to infact make it a widget and fake normals etc inside of a widget material as accurately as I can with an input vector for light direction.
A shame though as it is 100% working outside of AR.