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Displacement problem


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Hi folks, I'm having a little trouble with displacement shaders. I can't seem to get any ridges or indentations with my texture maps, only bumps. What I mean is, an all black texmap (rgb: 255,255,255) will not alter the surface, while any values above that will raise the surface. Is there some way that I can normalize the shader in VOPs so that a grey value (say, rgb: 128,128,128) will keep the surface even, while lower values produce dents, and higher values produce bumps?

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