/* Copyrighted Pixar 1989 */
/* From the RenderMan Companion p. 30 */
/* Listing 2.6  Defining a larger cube from smaller minicubes */

#include <ri.h>
#include <stdio.h>

/* 
 *   ColorCube(): create a unit color cube from smaller cubes 
 *   Parameters:
 *    n: the number of minicubes on a side
 *    s: a scale factor for each minicube
 */
void
ColorCube(n, s)
int n;
float s;
{
    int x, y, z;
    RtColor color;

    if( n<=0 )
        return;

    RiAttributeBegin();
        RiTranslate(-.5, -.5, -.5 );
        RiScale(1.0/n, 1.0/n, 1.0/n);

        for(x = 0; x < n; x++)
            for(y = 0; y < n; y++)
                for(z = 0; z < n; z++) {
                    color[0] = ((float) x+1) / ((float) n);
                    color[1] = ((float) y+1) / ((float) n);
                    color[2] = ((float) z+1) / ((float) n);
                    RiColor(color);
                    RiTransformBegin();
                        RiTranslate (x+.5, y+.5, z+.5);
                        RiScale(s, s, s);
                        UnitCube();
                    RiTransformEnd ();
                }

    RiAttributeEnd();
}