spin.py

def cube3d():
    win = GraphWin("3d", 200, 200, False)

    cube = [glm.vec3(1, 1, 1),
            glm.vec3(-1, 1, 1),
            glm.vec3(1, -1, 1),
            glm.vec3(1, 1, -1),
            glm.vec3(-1, -1, 1),
            glm.vec3(-1, 1, -1),
            glm.vec3(1, -1, -1),
            glm.vec3(-1, -1, -1)]

    proj = glm.perspective(90, 1, 0.1, 5)
    view = glm.lookAt(glm.vec3(-2, -3, 0),
                      glm.vec3(0, 0, 0), glm.vec3(0, 0, 1))

    ispin = 0

    while True:
        ispin += 0.001

        mvp = proj * view

        view = glm.lookAt(glm.vec3(1, 2, 1),
                          glm.vec3(0, 0, 0), glm.vec3(0, 0, 1))

        transformedCube = []

        rot = glm.mat4()

        rot = glm.rotate(rot, ispin, glm.vec3(1.0, 1.0, 1.0))
        rot = glm.rotate(rot, ispin, glm.vec3(0.0, 1.0, 1.0))

        for p in cube:
            clipSpace = mvp * rot * glm.vec4(p, 1.0)
            ndc = clipSpace.xyz / clipSpace.w

            screenPos = ((ndc.xy + glm.vec2(1.0)) / 2.0) * glm.vec2(200, 200)

            transformedCube.append(screenPos)

        pairs = [(0, 1), (1, 4), (4, 2), (2, 0), (1, 5), (2, 6),
                 (0, 3), (4, 7), (5, 7), (5, 3), (3, 6), (6, 7)]

        tc = transformedCube

        for i1, i2 in pairs:
            Line(Point(*tc[i1].xy), Point(*tc[i2].xy)).draw(win)

        for i, p in enumerate(transformedCube):
            Point(p.x, p.y).draw(win)
            Text(Point(p.x, p.y), "%d" % i).draw(win)

        win.flush()
        win.update()

        if win.closed:
            break

        for i in win.items:
            i.undraw()


cube3d()