1make_shape {
2    dist p = (p.[Z] - sin(p.[X]) * sin(p.[Y])) * 0.66;
3    colour p = sRGB.hue((sin(p.[X]) * sin(p.[Y]) + 1)/2);
4    bbox = [[-inf,-inf,-1], [inf, inf, +1]];
5    is_3d = true;
6}
7