[PyOpenGL-Users] glNormal3f not working for me

[McTaggart, K. <Kev...@dr...>]

When drawing a square, a call to glNormal3f doesn't appear to affect how
the square is drawn.  I'm trying to get a coloured front and dark back
by using the following:

	glColorMaterial(GL_FRONT_AND_BACK, GL_EMISSION)
	glPolygonMode(GL_FRONT, GL_FILL)
	glPolygonMode(GL_BACK, GL_LINE)
	glColor3f(0.0, 1.0, 0.0)=09
	glBegin(GL_POLYGON)
	glNormal3f(0.0, -1.0, 0.0) # Doesn't appear to have any
influence
	glVertex3f(1.0, -1.0, -1.0)          =20
	glVertex3f(1.0, -1.0, 1.0)         =20
	glVertex3f(-1.0, -1.0, 1.0)         =20
	glVertex3f(-1.0, -1.0, -1.0)        =20
	glEnd()                            =20

It appears that calling glNormal3f has no influence on which is the
front or back, and that I have to rearrange the order in which vertices
are called (clockwise versus counter-clockwise).  Any hints on how to
get glNormal3f to influence which is front and back? =20