dx = (4.0 * x/width)-2.0
dy = (4.0 * y/depth)-2.0
dz = (4.0 * z/height)-2.0

diff = math.sin(dx) + dy**2 - dz
fatness = 0.4

if diff < fatness and diff > -fatness:
	return Color(128, 78, 45, 255)
else:
	return empty