def resize(width, height):
	print 'resized to ',width,'x',height
	if height==0:
		height=1
	glViewport(0, 0, width, height)
	glMatrixMode(GL_PROJECTION)
	glLoadIdentity()
	gluPerspective(45, 1.0*width/height, 0.1, 100.0)
	glMatrixMode(GL_MODELVIEW)
	glLoadIdentity()