Miscellany
public text v1 · immutable glBegin(GL_QUADS)
glColor4f(1.0, 0.0, 1.0, opacity) # back purple
glVertex3f(x - r, y - r, z - r)
glVertex3f(x + r, y - r, z - r)
glVertex3f(x + r, y + r, z - r)
glVertex3f(x - r, y + r, z - r)
glColor4f(1.0, 1.0, 0.0, opacity) # front yellow
glVertex3f(x - r, y - r, z + r)
glVertex3f(x + r, y - r, z + r)
glVertex3f(x + r, y + r, z + r)
glVertex3f(x - r, y + r, z + r)
glEnd()