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An Add Attribute button is provided for some V-Ray materials. Select additional attributes that to add up to the appearance of the material. For more information see the Add Attributes And Layers section on the How to Work with Materials page.

Back Material – Defines the material V-Ray uses for back side faces as defined by their normals.

Translucency – Determines if the front or the back side of the material is more visible in the rendering process. By default this value is 0.5, which means that both sides are equally visible. When the value is closer to zero, the material facing the camera is more visible, when it is closer to 1, the back material is more visible. A texture can be used to control the variation of the effect.

Mult. by Front Diffuse – When enabled, the translucency is multiplied by the diffuse of the front material.