如何制作不同的正交投影Pyglet？

Question

我制作了两个立方体视口，但它们都是前正交投影，我需要它们来自侧面。这是绘图的代码draw_small是小静态立方体的绘图dwar_big是大立方体的绘图，可以移动，缩放和旋转

    def on_draw(self) :

        self.clear()

        pgl.glClear(pgl.GL_COLOR_BUFFER_BIT | pgl.GL_DEPTH_BUFFER_BIT)

        pgl.glViewport(0, 0, 650, 500)
        pgl.glMatrixMode(pgl.GL_PROJECTION)
        pgl.glLoadIdentity()
        pgl.glOrtho(-1300 / 8, 1300 / 8, -1000 / 8, 1000 / 8, 100, 500)
        pgl.glMatrixMode(pgl.GL_MODELVIEW)
        pgl.glLoadIdentity
        pgl.glTranslatef(0, 0, -100)
        pgl.glPolygonMode(pgl.GL_FRONT_AND_BACK, pgl.GL_FILL)
        draw_small()

        pgl.glPushMatrix()
        pgl.glTranslatef(self.x, self.y, self.z)
        pgl.glRotatef(self.xRotation, 1, 0, 0)
        pgl.glRotatef(self.yRotation, 0, 1, 0)
        pgl.glRotatef(self.zRotation, 0, 0, 1)
        pgl.glScalef(self.zoom, self.zoom, self.zoom)

        if not transparant:
            pgl.glPolygonMode(pgl.GL_FRONT_AND_BACK, pgl.GL_FILL)
        else:
            ogl.glPolygonMode(pgl.GL_FRONT_AND_BACK, pgl.GL_LINE)

        draw_big()

        pgl.glPopMatrix()


        pgl.glViewport(650, 0, 650, 500)
        pgl.glMatrixMode(pgl.GL_PROJECTION)
        pgl.glLoadIdentity()
        pgl.glOrtho(-1300 / 8, 1300 / 8, -1000 / 8, 1000 / 8, 0, 500)
        pgl.glMatrixMode(pgl.GL_MODELVIEW)
        pgl.glLoadIdentity()
        pgl.glTranslatef(0, 0, -100)
        pgl.glPolygonMode(pgl.GL_FRONT_AND_BACK, pgl.GL_FILL)

        draw_small()

        pgl.glPushMatrix()
        pgl.glTranslatef(self.x, self.y, self.z)
        pgl.glRotatef(self.xRotation, 1, 0, 0)
        pgl.glRotatef(self.yRotation, 0, 1, 0)
        pgl.glRotatef(self.zRotation, 0, 0, 1)
        pgl.glScalef(self.zoom, self.zoom, self.zoom)

        if not transparant:
            pgl.glPolygonMode(pgl.GL_FRONT_AND_BACK, pgl.GL_FILL)
        else:
            pgl.glPolygonMode(pgl.GL_FRONT_AND_BACK, pgl.GL_LINE)

        draw_big()

        pgl.glPopMatrix()

Answer 1

只需在视图空间中围绕y轴旋转视图90度：

pgl.glMatrixMode(pgl.GL_MODELVIEW)
pgl.glLoadIdentity
pgl.glTranslatef(0, 0, -100) 
pgl.glRotatef(-90, 0, 1, 0) # roatet 90 degrees around view space y axis

注意，左右视图由pgl.glRotatef(-90, 0, 1, 0)和pgl.glRotatef(90, 0, 1, 0)生成。 顶视图和底视图通过视图sapce x轴的旋转实现，分别由pgl.glRotatef(90, 1, 0, 0) pgl.glRotatef(-90, 0, 1, 0)实现。