/* Copyrighted Pixar 1989 */
/* From the RenderMan Companion p. 26 */
/* Listing 2.4   Alternative cube definition */

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

/* UnitCube(): Enter a unit cube into the scene */

UnitCube()
{
    static RtPoint square[4] = { 
        {.5,.5,.5}, {-.5,.5,.5}, {-.5,-.5,.5}, {.5,-.5,.5} 
    };

    /* far square */
    RiPolygon((RtInt) 4, RI_P, (RtPointer) square, RI_NULL);

    /* right face */
    RiRotate(90.0, 0.0, 1.0, 0.0);
    RiPolygon((RtInt) 4, RI_P, (RtPointer) square, RI_NULL);

    /* near face */
    RiRotate(90.0, 0.0, 1.0, 0.0);
    RiPolygon((RtInt) 4, RI_P, (RtPointer) square, RI_NULL);

    /* left face */
    RiRotate(90.0, 0.0, 1.0, 0.0);
    RiPolygon((RtInt) 4, RI_P, (RtPointer) square, RI_NULL);

    /* bottom face */
    RiRotate(90.0, 1.0, 0.0, 0.0);
    RiPolygon((RtInt) 4, RI_P, (RtPointer) square, RI_NULL);
        
    /* top face */
    RiRotate(180.0, 1.0, 0.0, 0.0);
    RiPolygon((RtInt) 4, RI_P, (RtPointer) square, RI_NULL);
}