case TRACE_CONTOUR: {
			size[0] -= 1.0;
			size[1] -= 1.0;
			size[2] -= 1.0;
			/* trace periphery - prioritize plane centers, more chance of hitting */
			VectorMA( boxOrigin, size[0]*-0.5, xAxis, p[k].pt ); k++;
			VectorMA( boxOrigin, -size[0]*-0.5, xAxis, p[k].pt ); k++;
			VectorMA( boxOrigin, size[1]*-0.5, yAxis, p[k].pt ); k++;
			VectorMA( boxOrigin, -size[0]*-0.5, yAxis, p[k].pt ); k++;
			VectorMA( boxOrigin, size[2]*-0.5, zAxis, p[k].pt ); k++;

			/* corners */
			VectorMA( boxOrigin, size[0]*-0.5, xAxis, p[k].pt );
			VectorMA( p[k].pt, size[2]*-0.5, zAxis, p[k].pt );
			k++;

			VectorMA( boxOrigin, -size[0]*-0.5, xAxis, p[k].pt );
			VectorMA( p[k].pt, size[2]*-0.5, zAxis, p[k].pt );
			k++;

			VectorMA( boxOrigin, size[1]*-0.5, yAxis, p[k].pt );
			VectorMA( p[k].pt, size[2]*-0.5, zAxis, p[k].pt );
			k++;

			VectorMA( boxOrigin, -size[1]*-0.5, yAxis, p[k].pt );
			VectorMA( p[k].pt, size[2]*-0.5, zAxis, p[k].pt );
			k++;
			for( k=4; k < maxTraces; k++ ){
				VectorMA( boxOrigin, size[0]*crandom()*-0.5, xAxis, p[k].pt );
				VectorMA( p[k].pt, size[1]*crandom()*-0.5, yAxis, p[k].pt );
				VectorMA( p[k].pt, size[2]*crandom()*-0.5, zAxis, p[k].pt );
			}
			break;
		}