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An example of a surface shader that defines a metal surface is:
<source lang="c">
surface metal (float Ka = 1; float Ks = 1; float roughness = 0.1;)
{
normal Nf = faceforward (normalize(N), I);
vector V = - normalize (I);
Oi = Os;
Ci = Os * Cs * (Ka * ambient() + Ks * specular (Nf, V, roughness));
}
</source>
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The arguments to the shaders are global parameters that are attached to objects of the model (so one metal shader can be used for different metals and so on). Shaders have no return values, but functions can be defined which take arguments and return a value. For example, the following function computes vector length using the [[dot product]] operator ".":
<source lang="c">
float length (vector v) {
return sqrt (v . v); /* . is a dot product */
}
</source>
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