// Compute coordinates, texture coordinates:
              for (i = 0; i < nlat; i++) {
                 y = 2 * ( i / (nlat-1) ) - 1;
                 r = Math.sqrt( 1 - y*y );
                 for (j = 0; j < nl; j++) {
                    phi = 2 * Math.PI * j / nl;
                    x = -Math.sin(phi)*r;
                    z = -Math.cos(phi)*r;
                    c[i*nl+j] = new SFVec3f(x,y,z);
                    tc[i*nl+j] = new SFVec2f( j/nl, i/(nlat-1) );
                 }
              }