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Using VRayMtlWrapper Material

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Another way to achieve this effect is through the use of VRayMtlWrapper.

Open the Material editor, create a VRayMtlWrapper and assign it to the shadow catcher. In our case – to the plane.

Enable the same options for the VRayMtlWrapper as the ones outlined in the previous approach:

  • Matte surface
  • Matte for refl/refr
  • Shadows
  • Affect alpha

Set the Alpha contribution to -1.0.

Select the Base material of the Shadow Catcher, in this case a VRayMtl. The base material will be visible in the reflections. The effect works on every geometry that has the VRayMtlWrapper applied to it.

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Optionally, the reflections that the car geometry receives can be overridden with another texture or a color. To achieve this, enable Secondary matte environment option from Render Setup > V-Ray tab > Environment rollout > Secondary matte environment where a different HDRI can be used as Secondary matte texture.

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Here's how the reflections and refractions are changed by the Secondary matte environment. The use of a secondary matte texture is not mandatory and can be omitted.

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Notes

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  • With V-Ray 3.0, the V-Ray Material Wrapper does not support the 3ds Max Standard material.
  • When working with V-Ray GPU engine, make sure to set the Alpha Contribution to -1.
  • In V-Ray 5, matte objects always show the background. Since V-Ray 6, however, the matte objects show the V-Ray Dome light instead of the background when a V-Ray Dome light is present in the scene.