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作为菜鸡,我对3d到2d最直观的想像是,在世界坐标系中放一个投影点和一个矩形屏幕,投影点和屏幕中心的连线垂直于屏幕,然后相对于投影点,屏幕的另一侧的棱台体内是可被拍摄的对象,然后就是非常直观的「拍摄」过程。正交投影可以视作投影点在无穷远处,这也是直观的。 我看闫令琪老师的图形学101也还是没看懂这一步,感觉不直观。问了下ai也还是云里雾里
不了解语境,或许跟射影几何有关