cannot read properties of undifined(reading distanceToSquared

[menghuaa]

Describe the bug

TriangleSplitter.js line341(TriangleSplitter.splitPlane) occured this error:'cannot read properties of undifined(reading distanceToSquared)'.

To Reproduce
I provide the code,you can try to use this file

testcsg.txt or this link https://jsfiddle.net/pnurty7v/1/

I find that TriangleSplitter.js splitByPlane( plane, clippingTriangle ) posSideVerts = [], so the error occured.
Expected behavior

I want to know the reason and the solution.

Screenshots

If applicable, add screenshots to help explain your problem (drag and drop the image).

Platform:

Device: [Desktop]
OS: [Windows]
Browser: [Chrome]
Three.js version: [r153]

[gkjohnson]

It looks like this is a result of a corner case where a vertex is calculated to be exactly on the plane of the intersected triangle, which is not handled correctly at the moment. Unfortunately I don't have the bandwidth to fix this at the moment and I don't have a great workaround other than to slightly shift the position of one of the brushes so that the calculation does not hit the case.

[menghuaa]

看起来这是极端情况的结果，其中顶点被计算为正好位于相交三角形的平面上，目前没有正确处理。不幸的是，我目前没有足够的带宽来解决这个问题，除了稍微移动其中一个画笔的位置，这样计算就不会遇到这种情况之外，我没有很好的解决方法。

Hello, I am currently facing a problem and I would like to calculate the minimum and maximum depth values of the part of box3 inside the camera cone in the camera coordinate system. This box3 is located between the far and near planes of the camera. I originally used the algorithm you wrote to calculate the intersection between box3 and the camera cone, traversing the vertices of the intersection to find the maximum and minimum depth values. However, I found that when neither the camera cone nor box3 changed, the calculated depth values sometimes changed. Do you have any ideas to calculate this depth value? The camera is an orthogonal camera.