Example
The following example shader makes use of the ambient, diffuse, faceforward, normalize and transform built-in shadeops as well as the checkerboard user-defined RSL plugin shadeop.
plugin "checkerboard"; surface checkmatte(float Ka = 1, Kd = 1;) { normal Nf = faceforward(normalize(N), I); color pattern = checkerboard(transform("object", P)); Oi = Os; Ci = Oi * Cs * pattern * (Ka * ambient + Kd * diffuse(Nf)); }Read more about this topic: Shadeop, Meaning in The RenderMan Context
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