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# module 'block' imported by twoview demo.
from gl import n3f, bgnpolygon, varray, endpolygon, lmbind
from GL import MATERIAL
# Draw a single 2x2x2 block with its center at (0, 0, 0)
# Arguments are the material indices (0 = don't call lmbind)
#
def block(m_front, m_back, m_left, m_right, m_top, m_bottom):
#
# Distances defining the sides
#
x_left = -1.0
x_right = 1.0
y_top = 1.0
y_bottom = -1.0
z_front = 1.0
z_back = -1.0
#
# Top surface points: A, B, C, D
#
A = x_right, y_top, z_front
B = x_right, y_top, z_back
C = x_left, y_top, z_back
D = x_left, y_top, z_front
#
# Bottom surface points: E, F, G, H
#
E = x_right, y_bottom, z_front
F = x_right, y_bottom, z_back
G = x_left, y_bottom, z_back
H = x_left, y_bottom, z_front
#
# Draw front face
#
if m_front: lmbind(MATERIAL, m_front)
n3f(0.0, 0.0, 1.0)
face(H, E, A, D)
#
# Draw back face
#
if m_back: lmbind(MATERIAL, m_back)
n3f(0.0, 0.0, -1.0)
face(G, F, B, C)
#
# Draw left face
#
if m_left: lmbind(MATERIAL, m_left)
n3f(-1.0, 0.0, 0.0)
face(G, H, D, C)
#
# Draw right face
#
if m_right: lmbind(MATERIAL, m_right)
n3f(1.0, 0.0, 0.0)
face(F, E, A, B)
#
# Draw top face
#
if m_top: lmbind(MATERIAL, m_top)
n3f(0.0, 1.0, 0.0)
face(A, B, C, D)
#
# Draw bottom face
#
if m_bottom: lmbind(MATERIAL, m_bottom)
n3f(0.0, -1.0, 0.0)
face(E, F, G, H)
def face(points):
bgnpolygon()
varray(points)
endpolygon()
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