I actually ended up achieving the result using substance painter but im still not really sure why it didnt work in marmoset, it seems you cant change the length of the internal facing rays in marmo but not sure if thats it.
I heard it was possible to do this and Im wondering how, specifcally I want to bake the details of a high poly as viewed from a specific perspective, how would I go about making the normals of the cage face in a direction I want so the rays bounce in that direction. Im using maya and marmoset mainly.