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V-Ray Blend material (with mixed Copper and Patina materials) is applied to the geometry. V-Ray Curvature map is used as the blend amount for the Coat material. In the Convex and Concave examples, the Threshold the Threshold is set to 0.300. All other parameters are left at their default values. In the Legacy example, as well as the Threshold adjustment, the Output Color Lift is set to 0.100 and the Sample Spread is assigned a value of 1.500. All other parameters are left at their default states. See the Both Mode note for information on how to set up that mode.
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Both mode outputs a red and green color gradient instead of a black and white one. Using it as a blend amount for the VRayBlendMtl produces color blended materials. To avoid this, we use the red and green outputs from the VRayCurvature map separately to create two monochromatic masks. This allows the generated red-green gradient to be used as a grayscale blend amount, like in all other Curvature modes. In this setup an additional (third) Dark Patina material is used, which appears in the most concave parts of the model. We connect the red output to the Blend amount RGB inputs of the Copper coat and the green output to the Blend amount RGB inputs of the Dark Patina coat. Click on the expandable menu to view the exact Hypershade setup for this example. In addition, the Threshold is set to 0.300 and the Output Color Lift is set to 0.180 to achieve a more pleasant result.
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