If points are beind the camera, we don't really want to erase them. This
patch marks invalid coordinates thus preventing them from intersecting
with a eraser.
The reason for using a large value to indicate "invalid coordinate"s are:
- No need to further break down the way we process `src_to_dist` point matching array for `hard_eraser` `soft_eraser`, makes the entire logic much easier.
- No eraser is gonna be touching such a large coordinate of `1e20`.
Technically there's this case where if a segment crosses the near or far clipping plane (to handle this correctly, you'll need to split that segment into two at the clipping plane position and it increases complexity a lot), and then you will have undefined erasing behaviour, however the worse case is that the one segment was completely removed, and in such case I think it's acceptable.
Pull Request: https://projects.blender.org/blender/blender/pulls/128738
57ca937a7c