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Fix #103562: preserve custom normals in BM_mesh_triangulate #121871

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Philipp Oeser merged 4 commits from lichtwerk/blender:103562 into main 2024-05-23 17:33:54 +02:00
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Philipp Oeser commented 2024-05-16 14:32:02 +02:00
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BM_mesh_triangulate is used in exporters (when the "Triangulate"
option is ON), the Triangulate modifier and currently also in the
Triangulate geometry node (even though there are plans to change this,
see !112264)

So in practice, exporters (Alembic/FBX/OBJ/Collada) were breaking
custom normals for game pipelines (unless everything was triangulated
beforehand).

This change builds upon 93c8955a72 (uses the use
BM_custom_loop_normals_to_vector_layer /
BM_custom_loop_normals_from_vector_layer pair of calls).

In the case of the Triangulate modifier, this had its own try at
preserving custom normals in 7d0fcaa69a -- doing very similar
things but as an option -- this is now removed (so it is always done,
which fits into "interpolate custom data if it's there" design that we have
nowadays).

NOTE: the "Triangulate Faces" operator already did the same

`BM_mesh_triangulate` is used in exporters (when the "Triangulate" option is ON), the `Triangulate` modifier and currently also in the `Triangulate` geometry node (even though there are plans to change this, see !112264) So in practice, exporters (Alembic/FBX/OBJ/Collada) were breaking custom normals for game pipelines (unless everything was triangulated beforehand). This change builds upon 93c8955a722b (uses the use `BM_custom_loop_normals_to_vector_layer` / `BM_custom_loop_normals_from_vector_layer` pair of calls). In the case of the `Triangulate` modifier, this had its own try at preserving custom normals in 7d0fcaa69a64 -- doing very similar things but as an option -- this is now removed (so it is always done, which fits into "interpolate custom data if it's there" design that we have nowadays). NOTE: the "Triangulate Faces" operator already did the same
Philipp Oeser added 1 commit 2024-05-16 14:32:11 +02:00 
`BM_mesh_triangulate` is used in exporters (when the "Triangulate"
option is ON), the `Triangulate` modifier and currently also in the
`Triangulate` geometry node (even though there are plans to change this,
see !112264)

This change builds upon 93c8955a72 (uses the use
`BM_custom_loop_normals_to_vector_layer` /
`BM_custom_loop_normals_from_vector_layer` pair of calls).

In the case of the `Triangulate` modifier, this has its own try at
preserving custom normals -- doing very similar things, could probably
be removed then

NOTE: the "Triangulate Faces" operator already did the same
Philipp Oeser requested review from Hans Goudey 2024-05-16 14:32:28 +02:00
Philipp Oeser added this to the Modeling project 2024-05-16 14:32:43 +02:00
Philipp Oeser requested review from Campbell Barton 2024-05-16 14:32:53 +02:00
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Hans Goudey reviewed 2024-05-16 14:41:00 +02:00
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Does this make the same function calls in calling code redundant? Looks like there's code near other uses of BM_mesh_triangulate that should be removed here.

Does this make the same function calls in calling code redundant? Looks like there's code near other uses of `BM_mesh_triangulate` that should be removed here.
Philipp Oeser commented 2024-05-16 14:55:25 +02:00
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Does this make the same function calls in calling code redundant? Looks like there's code near other uses of BM_mesh_triangulate that should be removed here.

I might be blind, got an example?

> Does this make the same function calls in calling code redundant? Looks like there's code near other uses of `BM_mesh_triangulate` that should be removed here. I might be blind, got an example?
Hans Goudey commented 2024-05-16 14:58:43 +02:00
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Two examples, so far include the modifier's use_clnors property (which suggests this should be optional maybe?) and any code using the "triangulate" BMesh operator ( edbm_quads_convert_to_tris_exec)

Two examples, so far include the modifier's `use_clnors` property (which suggests this should be optional maybe?) and any code using the "triangulate" BMesh operator ( `edbm_quads_convert_to_tris_exec`)
Philipp Oeser added 1 commit 2024-05-16 15:17:28 +02:00
Philipp Oeser commented 2024-05-16 15:25:15 +02:00
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the modifier's use_clnors property (which suggests this should be optional maybe?)

you mean the use_clnors used for subsurf? Or the keep_clnors used in the Triangulate modifier [that could probably go completely]?

>the modifier's `use_clnors` property (which suggests this should be optional maybe?) you mean the `use_clnors` used for subsurf? Or the `keep_clnors` used in the Triangulate modifier [that could probably go completely]?
Hans Goudey commented 2024-05-16 15:34:35 +02:00
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Oh sorry, I meant keep_clnors. Removing that seems fine, it aligns better with the "interpolate custom data if it's there" design that we have nowadays. It would involve removing the keep_custom_normals RNA property though.

Oh sorry, I meant `keep_clnors`. Removing that seems fine, it aligns better with the "interpolate custom data if it's there" design that we have nowadays. It would involve removing the `keep_custom_normals` RNA property though.
Campbell Barton approved these changes 2024-05-17 05:29:40 +02:00
Philipp Oeser added 2 commits 2024-05-22 14:02:37 +02:00
Remove the "Keep Normals" option from the modifier
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10637f8473 
This is now always done.
Basically reverts 7d0fcaa69a.
Philipp Oeser requested review from Hans Goudey 2024-05-22 14:02:56 +02:00
Hans Goudey approved these changes 2024-05-23 17:04:11 +02:00
Philipp Oeser commented 2024-05-23 17:10:06 +02:00
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@blender-bot build

@blender-bot build
Philipp Oeser merged commit f3c32a36bc into main 2024-05-23 17:33:54 +02:00
Philipp Oeser deleted branch 103562 2024-05-23 17:33:56 +02:00
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