The RenderMan Interface - Paul Bourke

}
normal Nf = faceforward(normalize(N), I);
vector V = -normalize(I);
Oi = Os;
Ci = Os * (Cs * (Ka*ambient() + Kd*diffuse(Nf)) +
specularcolor * Ks*specular(Nf, V, roughness) );
A.2.6
Painted plastic surface
surface
paintedplastic(
float Ka = 1;
float Kd = .5;
float Ks = .5;
float roughness = .1;
color specularcolor = 1;
string texturename = ””;)
{
normal Nf = faceforward(normalize(N), I);
vector V = -normalize(I);
Oi = Os;
Ci = Os * (Cs * color texture(texturename) *
(Ka * ambient() + Kd * diffuse(Nf)) +
specularcolor * Ks * specular(Nf, V, roughness));
}
If the Texture Mapping capability is not supported by a particular renderer implementation,
the paintedplastic surface shader operates identically to the plastic shader.
A.3 Light Source Shaders
A.3.1
Ambient light source
light
ambientlight(
float intensity = 1;
color lightcolor = 1;)
{
Cl = intensity * lightcolor;
}
A.3.2
Distant light source
light
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