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Erschienen in:
2008 | OriginalPaper | Buchkapitel
Modifying surface geometry
Erschienen in: Writing mental ray® Shaders
Verlag: Springer Vienna
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So far, our shaders have only been calculating color values—the type of the result argument has been a pointer to miColor. Many shaders depend upon the shape of a surface to calculate the way in which light determines the resulting color value. By modifying the surface geometry in a shader, we can affect the calculation of that color. In a
displacement shader
, the result is a miScalar that defines how far along the surface normal the current point should be moved. Displacement shaders can provide geometric detail at a scale that would be very difficult to model directly.