/* 
 * 
 * FILE:  tebNormalMap.sl
 *
 *
 * DESCRIPTION:  
 *   
 *      
 * Copyright (c) 1997 Thomas E. Burge.  All rights reserved.  
 *
 */

surface
tebNormalMap()
{
   point  Nf;  /* face forward normal */

   Nf = point faceforward( normalize(N), I );

   Ci = color( (xcomp(Nf)+1)/2, (ycomp(Nf)+1)/2, -zcomp(Nf) );
}