Refraction in Compositing?

V-Ray for 3ds Max V-Ray for 3ds Max :: Issues
1

Just as a rendering test, for compositing, I setup a simple scene. Teapot on a ground plane, mirror behind it and piece of glass in front.

I’m trying to find the correct way to change the color of the teapot and render only what is needed;

teapot
shadows cast
reflection
refraction
w/ alpha

and composite the new teapot back into the scene. If you look at the 3ds Max scene and images, I have been successful in getting every element I need to render correctly with an alpha channel EXCEPT, the refraction of the teapot through the glass. I’ve tried adjusting v-ray properties, using the VRayMtlWrapper, using the Image Sampler Render mask and nothing works at all.

Not sure if I’m approaching this correctly but all indications seem like these settings should work. Any help would be appreciated.

2

Quoting the docs:

No GI on other mattes – Causes the object to appear as a matte object in reflections, refractions, GI, etc. for other matte objects. Note that if this is ON, refractions for the matte object might not be calculated (the object appears a matte object to itself and is not able to “see” the refractions on the other side).

You need to disable that option for the glass. This, however, may lead to further complications, since to properly see the teapot’s reflection in the mirror through the glass, the same option for the mirror also needs to be disabled (this concerns the reflections on the plane, too).

What I would do is simply disable the matte option of the glass.

3

Roger that. Appreciate the feedback Aleksandar!