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我有一个金属丝立方体：glut.glutWireCube(1); 如果我想要一个立方体的前视图位于屏幕的中心，我使用 glu.gluLookAt(0, 0, 15, 0, 0, 0, 0, 1, 0) 就可以了。但是当我尝试 glu.gluLookAt(0, 0, 15, 6, -4, 0, 0, 1, 0); 立方体走到顶部和左侧，但立方体变形（倾斜线）。我究竟做错了什么？