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.
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The Blend material settings are organized in Basic and Advanced modes. You can switch the mode from the toggle button under the Preview Swatch or globally from the Configuration rollout of the Settings tab.
From the Add Attribute button, you can select additional attributes that can add up to the appearance of the material. For more information, see the Attributes section.
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Holding down Ctrl (or Cmd on macOS) while having the Add Attribute menu open, allows selecting multiple entries without closing the dropdown.
A Reset option is provided in the context menu of each Color Slot. You can reset the color to the default one.