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Fix #108517: Mesh split edges can give invalid indices #108826

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Hans Goudey merged 3 commits from HooglyBoogly/blender:fix-split-edges-bad-indices into blender-v3.6-release 2023-06-13 14:10:18 +02:00
Conversation 2 Commits 3 Files Changed 4 +120 -157
Hans Goudey commented 2023-06-09 23:11:44 +02:00
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The split edges code had a complex method of merging duplicate edges,
going backwards to avoid shifting elements in a vector. Sometimes it
could result in incorrect corner edge indices though, if it moved an
index that matched one of the local variables (I think! I've been trying
to understand this all day and still struggling). Instead, replace it
with a VectorSet that handles the deduplication by itself, and
avoid creating the new edges until the end of the algorithm.

I think this code could still be simpler if we tried to reduce the
amount of things happening at the same time, making more code
deal with the input or final state rather than an in-between one.
But to avoid making the change too complicated I stopped here.

The split edges code had a complex method of merging duplicate edges, going backwards to avoid shifting elements in a vector. Sometimes it could result in incorrect corner edge indices though, if it moved an index that matched one of the local variables (I think! I've been trying to understand this all day and still struggling). Instead, replace it with a `VectorSet` that handles the deduplication by itself, and avoid creating the new edges until the end of the algorithm. I think this code could still be simpler if we tried to reduce the amount of things happening at the same time, making more code deal with the input or final state rather than an in-between one. But to avoid making the change too complicated I stopped here.
👍 1
Hans Goudey requested review from Jacques Lucke 2023-06-09 23:14:17 +02:00
Hans Goudey force-pushed fix-split-edges-bad-indices from 8ffdce0c53 to 733a0c48f0 2023-06-09 23:24:07 +02:00 Compare
Hans Goudey changed title from Fix #108517: Mesh split edges can give invalid indices to Fix #108517: Mesh split edges can give invalid indices 2023-06-09 23:24:20 +02:00
HooglyBoogly changed target branch from main to blender-v3.6-release 2023-06-09 23:24:22 +02:00
Hans Goudey added this to the 3.6 LTS milestone 2023-06-09 23:26:36 +02:00
Hans Goudey commented 2023-06-09 23:28:17 +02:00
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Hey @JacquesLucke, sorry to pull you in here, this code is no fun! But maybe it's a bit better now.

The loose_edges IndexMask works better in main BTW, it's a bit ugly here in 3.6.

Hey @JacquesLucke, sorry to pull you in here, this code is no fun! But maybe it's a bit better now. The `loose_edges` `IndexMask` works better in `main` BTW, it's a bit ugly here in 3.6.
Hans Goudey commented 2023-06-10 18:06:08 +02:00
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@blender-bot build

@blender-bot build
Jacques Lucke approved these changes 2023-06-13 09:54:18 +02:00
source/blender/blenlib/BLI_ordered_edge.hh
@ -0,0 +36,4 @@
return (this->v_low << 8) ^ this->v_high;
}
uint64_t hash2() const
Jacques Lucke commented 2023-06-13 09:45:49 +02:00
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Looks like this can be removed.

Looks like this can be removed.
source/blender/blenlib/CMakeLists.txt
@ -318,7 +318,7 @@ set(SRC
BLI_noise.h
BLI_noise.hh
BLI_offset_indices.hh
BLI_parameter_pack_utils.hh
Jacques Lucke commented 2023-06-13 09:45:10 +02:00
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Why remove this line?

Why remove this line?
Hans Goudey added 2 commits 2023-06-13 14:09:25 +02:00
Hans Goudey merged commit 8a11f0f3a2 into blender-v3.6-release 2023-06-13 14:10:18 +02:00
Hans Goudey deleted branch fix-split-edges-bad-indices 2023-06-13 14:10:22 +02:00
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