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/* plastic surface shader
*
* Pixie is:
* (c) Copyright 1999-2003 Okan Arikan. All rights reserved.
*/
surface plastic (float Ka = 1, Kd = 0.5, Ks = 0.5, roughness = 0.1;
color specularcolor = 1;) {
normal Nf = faceforward (normalize(N),I);
Ci = Cs * (Ka*ambient() + Kd*diffuse(Nf)) + specularcolor * Ks *
specular(Nf,-normalize(I),roughness);
Oi = Os;
Ci *= Oi;
}