The RenderMan Interface - Paul Bourke

Appendix A
STANDARD RENDERMAN INTERFACE SHADERS
In this section the required RenderMan Interface shaders are defined.
A.1 Null Shader
This shader does nothing and is intended to be a placeholder if no action is to be performed.
There is a null shader for every class of shader.
A.2 Surface Shaders
A.2.1
Constant surface
surface
constant()
{
Oi = Os;
Ci = Os * Cs;
}
A.2.2
Matte surface
surface
matte(
float Ka = 1;
float Kd = 1;)
{
normal Nf = faceforward(normalize(N), I);
Oi = Os;
Ci = Os * Cs * (Ka*ambient() + Kd*diffuse(Nf));
}
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