Contact shadows->live onto CG

[MiloMindbender]

Need to figure out a method for live talent on greenscreen to cast shadows onto the unreal CG layers. This will use the setup where the greenscreen is lit so the live talent casts a shadow onto the floor and the greenscreen key is adjusted to let the shadow through.

This depends on having the right lighting on the greenscreen and arranging lighting in the CG layer so objects there will cast similar looking shadows, for soft shadows this will probably require the CG to use ray traced lighting.