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def triangles():
    glBegin(GL_TRIANGLES)
    for x in range(shape[0]-1):
        for y in range(shape[1]-1):
            triangle(x,y, x,y+1, x+1,y)
            triangle(x,y+1, x+1,y+1, x+1,y)
        sys.stderr.write("."); sys.stderr.flush()
    glEnd()
    sys.stderr.write("\n"); sys.stderr.flush()