The RenderMan Interface - Paul Bourke

A.2.3
Metal surface
surface
metal(
float Ka = 1;
float Ks = 1;
float roughness =.1;)
{
normal Nf = faceforward(normalize(N), I);
vector V = -normalize(I);
Oi = Os;
Ci = Os * Cs * (Ka*ambient()+Ks*specular(Nf, V, roughness));
}
A.2.4
Shiny metal surface
surface
shinymetal(
float Ka = 1;
float Ks = 1;
float Kr = 1;
float roughness = .1;
string texturename = ””; )
{
normal Nf = faceforward(normalize(N), I);
vector V = -normalize(I);
vector D = reflect(I, normalize(Nf));
D = vtransform(”current”, ”world”, D);
Oi = Os;
Ci = Os * Cs * (Ka*ambient() + Ks*specular(Nf, V, roughness)
+ Kr*color environment(texturename, D));
}
If the Environment Mapping capability is not supported by a particular renderer implementation,
the shinymetal surface shader operates identically to the metal shader.
A.2.5
Plastic surface
surface
plastic(
float Ka = 1;
float Kd =.5;
float Ks =.5;
float roughness =.1;
color specularcolor = 1;)
{
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