The V-Ray Blend Material can be used to layer several V-Ray compatible materials in an efficient manner. It can be used to create complex materials like car paints, human skin (when used with the V-Ray Subsurface Scattering Material as a base material) etc.
V-Ray Blend Material takes a base material and applies other materials (coatings) on top of it. This works like a stack, where each coat material blends between its own shading and that of the materials below it in the stack
Additive Mode – When enabled, causes the V-Ray Blend Material to behave like a multi-layered Shellac material. Note that this would often result in a physically incorrect material (e.g. a material that reflects more light than falls on it). It is not recommended to use this option unless you know what you are doing.
Add Coat – Adds another Coat layer to the stack.
Base Material – Allows the user to select the base material to which the bump/normal effect will be added.
Coat – Enables/ disables the layer in the stack.
Material – Specifies material to use as coating.
Blend – Specifies how much of the final result is contributed by the corresponding coating material, and the rest of the materials below it. If the Blend amount is white, the final result is comprised of the coat material only, and other materials below it are blocked. If the Blend amount is black, a coat material has no effect on the final result. This parameter can also be controlled by a texture map.
Blend Tex Mult – Specifies a multiplier for the amount that the texture is blended with the Blend color.
Can be Overridden – When disabled, the material is not overridden by the Material Override option in the Render Settings.