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Validate shell orientations #1968

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merged 4 commits into from
Aug 4, 2023

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A-Walrus
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Addresses part of #1935.

Currently bugged, so marked as draft.
The problem is how to check whether two half-edges are reverse of one another:

  • Make sure that start vertexes are different (fails on circles)
  • Make sure that boundarys are reverse of one another (fails when different paths)
  • Sample the edges?

Any help appreciated, thanks!

@hannobraun
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Thank you for the pull request, @A-Walrus! And sorry for taking a few days to get to it. I had other things on my mind over the weekend 😄

The problem is how to check whether two half-edges are reverse of one another:

  • Make sure that start vertexes are different (fails on circles)
  • Make sure that boundarys are reverse of one another (fails when different paths)
  • Sample the edges?

I think checking that the boundaries are reverse should be the answer here. That requires the coordinate systems of all local path that refer to the same curve to match each other. Which I think is a reasonable requirement, exactly because we need to address cases like this.

We already have the Shell validation check that checks edge coincidence, but it's written in such a way, that it doesn't require the path coordinate systems to match. Maybe a good next step would be to rewrite that check to require just that, see how much fails, and figure out what it would take to make it work.

@hannobraun
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To follow up on my previous comment, I've opened #1973. This directly affects my work on #1937 (as in, the code I'm currently writing is unlikely to work due to this), so I'm looking into it now.

@hannobraun
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@A-Walrus I've addressed #1973 in #1982. Unless I'm missing something, that means further work on this pull request should be un-blocked now!

@A-Walrus A-Walrus force-pushed the validate_orientations branch from 73e0cd8 to 714a6a0 Compare August 3, 2023 14:24
@A-Walrus A-Walrus marked this pull request as ready for review August 4, 2023 07:07
@A-Walrus A-Walrus requested a review from hannobraun as a code owner August 4, 2023 07:07
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@hannobraun hannobraun left a comment

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Thank you, @A-Walrus, looks good!

One thing to note is that the new validation check relies on GlobalEdge, which is on its way to being removed. There is already the new Curve, which fulfills the same purpose but is more flexible.

As part of my work on #1937, I've already amended the other validation checks to also use Curve, in preparation of removing GlobalEdge at a later point.

All of that is no reason not to merge this pull request. I'm just providing some context on how the code being changed here is currently developing.

shell: &Shell,
errors: &mut Vec<ValidationError>,
) {
let mut global_to_half: HashMap<ObjectId, Vec<_>> = HashMap::new();
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For some additional type safety, it should be possible to replace ObjectdId with HandleWrapper<GlobalEdge> here. This was not possible before, due to a horribly shameful workaround (:grin:), but that workaround was removed in #1951.

This is just a note, not a change request. I don't think it would make a difference here.

@hannobraun hannobraun merged commit 0515f5f into hannobraun:main Aug 4, 2023
@A-Walrus A-Walrus deleted the validate_orientations branch September 25, 2023 10:35
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2 participants