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Tutorial steps
In this tutorial, we turn a plane into a shadow catcher/matte object. There are two ways to do that:
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Open the scene you will use for this tutorial and let's delve into each method.
Using V-Ray Object Properties
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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.
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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Using VRayMtlWrapper Material
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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.
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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