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Additional Surface Properties 

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 The options from this rollout are inactive when the render engine is set to V-Ray CUDA.


 

 

Use Irradiance Map – When enabled, the Irradiance Map approximates diffuse indirect illumination for the material. If this is off, brute force GI is used. You can use this for objects in the scene which have small details and are not approximated very well by the Irradiance Map.

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Caustics multiplier – Determines the effect of caustics on the material.

 

Matte Properties

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 When using the V-Ray CUDA engine, only the Matte SurfaceAlpha ContributionGenerate Render Elements and Shadows options are active from this rollout. 

Matte surface – Makes the material appear as a matte material, which shows the background, instead of the base material, when viewed directly. Note that the base material is still used for things like GI, caustics, reflections etc.

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  • Adding a V-Ray material override as an Extra V-Ray Attribute to the Shading Group of the material, allows for a custom environment to be used. For more information, see the Shading Group Attributes page.

 

Miscellaneous

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 This option is not active when using the V-Ray CUDA engine.

 

 

GI surface ID – This number can be used to prevent the blending of light cache samples across different surfaces. If two objects have different GI surface IDs, the light cache samples of the two objects are not blended. This can be useful to prevent light leaks between objects of vastly different illumination.