问题描述
如果在Three.js / WebGL中有两个平面，并且其中一个或两个都是透明的，有时后面的平面将被上面的透明平面隐藏。这是为什么？
When you have two planes in Three.js / WebGL and one or both of them are transparent, sometimes the plane behind will be hidden by the transparent plane above. Why is this?
推荐答案
这不是一个错误，它只是OpenGL（以及WebGL）的工作原理。透明曲面与z缓冲区不兼容，因此必须手动排序并从前到后渲染。三个JS正试图为你做这个（这就是为什么当你设置X值> 0时问题就消失了）但是不能很好地处理像你正在展示的交叉几何的情况。
This is not a bug, it's just how OpenGL (and, hence, WebGL) works. Transparent surfaces don't play well with the z-buffer, and as such must be manually sorted and rendered back-to-front. Three JS is attempting to do this for you (which is why the problem goes away when you set the X value > 0) but cannot robustly handle the case of intersecting geometry like you're showing.
我已经在，所以你可能想引用它。
I've explained the issue more in-depth in a different SO question, so you may want to reference that.
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