from piscript.PiModule import *

init3d("litsquare", 250, 150)
import math

set_eye([0,0,10,1])
set_light([-1,1,0.5,0])
for i in range(37):

	beginpage()
	center()
	scale(100)
	translate(0,-0.5)
	e = get_eye()
	L = get_light()
	newpath()
	moveto3d(0,0,0)
	lineto3d(1,0,0)
	lineto3d(1,1,0)
	lineto3d(0,1,0)
	closepath3d()
	if e[2] > 0:
		s = (1+L[2])*0.5 + 0.5
		fill(s,0,0)
	else:
		s = (1-L[2])*0.5 + 0.5
		fill(0,0,s)
	stroke(0)
	endpage()
	rotate3d([0,1,0], math.pi/18)
flush()