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Correctly join triangles in BuildShell::tetrahedron #1778

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merged 7 commits into from
Apr 21, 2023
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hannobraun
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Previously, the edges weren't joined correctly, as the vertices were ignored. This came out of my work on #1713.

`HalfEdge` references `GlobalEdge` (which was returned before), so this
is strictly more powerful. It causes some inconvenience, which I'm going
to address in future commits.
Move that responsibility to its caller. This makes things a bit more
messy for now, but there are two extenuating circumstances:

1. It's necessary. The current approach to joining is insufficient, as
   it doesn't update the start vertex, and `BuildFace::triangle` doesn't
   have the information it needs to do it properly.
2. The new, repetitive code in `BuildShell::tetrahedron` can be factored
   into a new operations API, one specifically for joining.
Previously, the start vertices were ignored when joining, not leading to
a correct result.
@hannobraun hannobraun merged commit 2af2116 into main Apr 21, 2023
@hannobraun hannobraun deleted the operations branch April 21, 2023 09:19
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