/* metal.sl - Standard metal surface for RenderMan Interface.
 * (c) Copyright 1988, Pixar.
 *
 * The RenderMan (R) Interface Procedures and RIB Protocol are:
 *     Copyright 1988, 1989, Pixar.  All rights reserved.
 * RenderMan (R) is a registered trademark of Pixar.
 */


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));
}