V-Ray for Rhino Manual - Rum

Other Uses for transparency mapping
There are many ways to use transparency map, not just used only for text mask as example before. Here are
some more examples often used to create texture map. First is using a gradient Bitmap as the Diffuse
Transparency mask, let the yellow color of Diffuse1 show up through the white area at the cup and create two
gradient colors on the cup as image on the right. This is the better way then using a gradient Bitmap directly
as the Diffuse texture because of its flexibility of changing the colors. You will have to make another Bitmap
of different colors combination if the color need to be changed.
Second example is using other grayscale Bitmap as the transparency mask. Although it is not a
gradient image, but they work exact the same. Rendered as image on the right.
Third example is adding another Diffuse2 layer, and assigns a 0 degree and a 180 degree gradient
Bitmaps to Diffuse and Diffuse1 in Transparency. Give the Diffuse2 a third color to create this threecolor
gradient rendering effect for the cup. Rendered image as right.
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V-Ray for Rhino