VRayMtrlWrapper

[eyepiz]

VRayMtrlWrapper support in GPU for Matte shadow and reflection.

[vlado]

It's a tough one to do it in a way that matches the production renderer; still haven't figured out the correct approach for it. It's certainly possible to get *some* kind of shadow catcher, but people will complain if it's too different from the production one.

Best regards,
Vlado

[eyepiz]

It's a tough one to do it in a way that matches the production renderer; still haven't figured out the correct approach for it. It's certainly possible to get *some* kind of shadow catcher, but people will complain if it's too different from the production one.

Best regards,
Vlado

Is there another way to achieve a similar result with RT GPU? Typically I usually use this in an open studio set up to get a nice alpha out of the background and comp it in Photoshop or AE.

Simple open studio set ups with a dome light, HDRI and few plane is where RT GPU's wicked speed shines compared to CPU.

I would love to be able to do my product renderings with RT GPU.

[Svetlozar Draganov]

It is possible to bake beforehand shadow/reflection map-masks using Vray Advanced Renderer and use these maps as opacity masks for shadow/reflection material.
There are some limitations with that approach of course - for example reflection-maks will be view dependent and it will only work from the view that is baked from.
Shadow-mask won't be view dependent but if you decide to change light positions you have to also update it.

[e3di]

Has this advanced any please? I really miss not being able to render mattes with my GPU's.

[Svetlozar Draganov]

Yes it is ADV. Matte functionality is not supported in V-Ray RT GPU.
You can however use the same baking technique and use the baked shadow map as opacity map.