VRayMtl to Render 3D Object as a flat plane

[Morne]

How can I make a 50% Opaque material that lets me render 3D Objects asif it was just a flat plane? (I want to render my 3D people asif they were just semi transparent white planes - ie without any depth to them)

[vlado]

One way it to use a VRayOverrideMtl material; put the original material as the base material; give it some refraction and set the IOR to 1.0; for the "refraction" material put a completely transparent VRayMtl material.

I'm not sure how this will work for the shadows though.

Best regards,
Vlado