Vray Material Wrapper for reflections

We are currently running into issues with reflections using Vray layers in our current workflow.
In order to have the reflections accurately match all of our finish combinations, we would need to render every possible permutation. This would drastically add to our render count.
Does anyone know if we could leverage the Vray Material Wrapper to accomplish our goal of having accurate reflections and minimize render count?

Below is a basic workflow theory using the Vray Material Wrapper. Has anyone tried anything similar or have any suggestions on a better way to achieve our goals?


You could certainly try to separate the reflections using the Vray Mtl Wrapper. It has an option to capture reflections only. However, the feasibility of this approach is highly dependent on the reflection properties. If the glass example above is separately configurable with different shapes and different reflective properties then it becomes practically impossible to separate it. It’s because the reflection changes for every change of configuration on the glass layer as well.

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I suppose a more common example in this case is to separate the refraction.
We could try to render the glass and foreground ball together in one layer, then the blue ball in a separate layer if it is also configurable. This was attempted in a few projects, but it is again highly dependent on whether the glass is configurable or not.

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Thanks for the response @AndreiSE .
In our usage scenario. All three elements in the above example would be configurable. The models would always stay the same but the materials would need to be configurable.

Do you have any other thoughts on how we might be able to accomplish our goals without having to render every unique combination?

Well, it sounds like there might be a solution then, if the geometry doesn’t change. I think we are going to meet to discuss additional details.
Have you guys attempted separating the passes yet using the Vray Mtl Wrapper in 3dsmax?

That’s great news. Thanks for taking an interest in this @AndreiSE.
The example I shared with the glass and spheres was created in max with the Vray Mtl Wrapper. It required 2 separate materials be applied to the glass geometry. In the first pass, A Vray glass material is applied. The glass material has 0% reflection and 100% refraction. For the second pass, a Vray Mtl Wrapper is applied with 100% reflection. These two passes were then composited in Photoshop.