为什么我们需要透视划分? [英] Why do we need perspective division?

问题描述

我知道透视划分是通过将x，y和z除以w来获得标准化的设备坐标的.但是我不明白这样做的目的.另外，它与剪辑有关吗?

I know perspective division is done by dividing x,y, and z by w, to get normalized device coordinates. But I am not able to understand the purpose of doing that. Also, does it have anything to do with clipping?

推荐答案

我的意思是为什么我们需要那个?

I mean why do we need that?

用通俗易懂的话说:使透视变形起作用.在透视投影矩阵中，Z坐标被混合"到W输出分量中.因此，Z坐标的值越小，即越接近原点，则缩放的内容就越多，即在屏幕上越大.

In layman terms: To make perspective distortion work. In a perspective projection matrix, the Z coordinate gets "mixed" into the W output component. So the smaller the value of the Z coordinate, i.e. the closer to the origin, the more things get scaled up, i.e. bigger on screen.

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