在OpenGL中混合2D和3D（使用pyglet）

Question

我正在尝试在Pyglet中使用OpenGL将2D和3D结合起来，也就是说，先绘制一个3D场景，然后切换到正交投影，接着在上面绘制一些东西。我先绘制3D的内容，然后把投影矩阵推入栈中，接着使用glOrtho创建一个正交投影矩阵，绘制2D的内容，最后再把之前的矩阵从栈中弹出。3D的内容绘制得很好，但不知为什么2D的部分根本没有绘制出来，即使单独绘制也不行。以下是代码：

class Window(pyglet.window.Window):

    # resolution
    width, height = 1024, 786

    def __init__(self, width, height):

        # initialise window
        super(Window, self).__init__(width, height)

        # set title
        self.set_caption("OpenGL Doss")

        # call update() at 30fps
        pyglet.clock.schedule_interval(self.update, 1 / 30.0)

        glEnable(GL_TEXTURE_2D)         # enable textures
        glShadeModel(GL_SMOOTH)         # smooth shading of polygons
        glClearColor(0.0, 0.0, 0.0, 0.0)

        glClearDepth(1.0)

        glDepthFunc(GL_LEQUAL)           
        glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST)   # make stuff look nice

        self.world = World()            # initialise world

        self.label = pyglet.text.Label('Hello, world',
                          font_name='Times New Roman',
                          font_size=20,
                          width=10, height=10)

    def on_resize(self, width, height):
        print 'on resize'
        if height == 0:
            height = 1
        glViewport(0, 0, width, height) # specify viewport

        # load perspective projection matrix
        glMatrixMode(GL_PROJECTION)
        glLoadIdentity()
        gluPerspective(45, 1.0 * width / height, 0.1, 100.0)
        #glLoadIdentity()

    def on_draw(self):
        self.set3d()

        # draw 3d stuff
        self.world.draw()

        self.set2d()

        # draw 2d stuff
        self.draw2d()

        self.unSet2d()

    def update(self, dt):
        "called at set interval during runtime"
        #maze = self.world.maze
        maze_platform = self.world.maze_platform

        pacman = maze_platform.maze.pacman

        maze_platform.update()

        # send it world pointer
        pacman.update(self.world)



    def on_key_press(self, symbol, modifiers):
        control.press(symbol, modifiers)

    def on_key_release(self, symbol, modifiers):
        control.release(symbol, modifiers)

    def set3d(self):
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
        glEnable(GL_DEPTH_TEST)         # enable depth testing
        # reset modelview matrix
        glMatrixMode(GL_MODELVIEW)
        glLoadIdentity()

    def set2d(self):

        glDisable(GL_DEPTH_TEST)
        # store the projection matrix to restore later
        glMatrixMode(GL_PROJECTION)
        glPushMatrix()

        # load orthographic projection matrix
        glLoadIdentity()
        #glOrtho(0, float(self.width),0, float(self.height), 0, 1)
        far = 8192
        glOrtho(-self.width / 2., self.width / 2., -self.height / 2., self.height / 2., 0, far)

        # reset modelview
        glMatrixMode(GL_MODELVIEW)
        glLoadIdentity()

        #glClear(GL_COLOR_BUFFER_BIT)



    def unSet2d(self):

        # load back the projection matrix saved before
        glMatrixMode(GL_PROJECTION)
        glPopMatrix() 

    def draw2d(self):
        z=-6
        n=100
        glTranslatef(0, 0.0, -z)


        glBegin(GL_TRIANGLES)
        glVertex3f(0.0, n, 0.0)
        glVertex3f(-n, -n, 0)
        glVertex3f(n, -n, 0)
        glEnd()


def main():
    window = Window(Window.width, Window.height)
    pyglet.app.run()
    print 'framerate:', pyglet.clock.get_fps(), '(error checking = %s)' % pyglet.options['debug_gl']

if __name__ == '__main__': main()
    #command = 'main()'
    #cProfile.run(command)

opengl pyglet 2d graphics 3d rendering orthographic projection rendering pipeline

在OpenGL中混合2D和3D（使用pyglet）

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