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Fix #107123: Refactor sculpt normal calculation to require vert poly map #107458

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Joseph Eagar merged 6 commits from HooglyBoogly/blender:pbvh-faces-normals-fix-alternate into main 2023-05-09 22:36:37 +02:00
Conversation 0 Commits 6 Files Changed 3 +69 -128
Hans Goudey commented 2023-04-29 06:16:46 +02:00
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Change PBVH normal calculation to also update vertices connected to
vertices with an update tag. This is necessary because vertex normals
are the mixed face normals, so changing any face's normal will change
the normals of all connected faces.

This change requires that the PBVH always have a vertex to face
topology map available. In the future this will likely be cached on
meshes though, which will reduce the delay it adds when entering sculpt
mode.

Now, first all face normals are updated, then the normals for
connected vertices are mixed from the face normals. This is a
significant simplification to the whole process, which previously
worked with atomics and normals at the triangle level. Similar changes
changes for regular non-sculpt normal calculation are being worked on
in #105920.

Change PBVH normal calculation to also update vertices connected to vertices with an update tag. This is necessary because vertex normals are the mixed face normals, so changing any face's normal will change the normals of all connected faces. This change requires that the PBVH always have a vertex to face topology map available. In the future this will likely be cached on meshes though, which will reduce the delay it adds when entering sculpt mode. Now, first all face normals are updated, then the normals for connected vertices are mixed from the face normals. This is a significant simplification to the whole process, which previously worked with atomics and normals at the triangle level. Similar changes changes for regular non-sculpt normal calculation are being worked on in #105920.
Hans Goudey added 1 commit 2023-04-29 06:16:54 +02:00
Hans Goudey added this to the Sculpt, Paint & Texture project 2023-04-29 06:17:01 +02:00
Joseph Eagar requested changes 2023-04-29 23:21:28 +02:00
source/blender/blenkernel/intern/pbvh.cc Outdated
@ -1461,3 +1419,2 @@
for (int i = 0; i < totvert; i++) {
const int v = verts[i];
threading::parallel_for(positions.index_range(), 1024, [&](const IndexRange range) {
Joseph Eagar commented 2023-04-29 23:20:52 +02:00
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We can't afford to iterate over all the verts of the mesh here. It's better to build a list of verts to update from the PBVH nodes.

We can't afford to iterate over all the verts of the mesh here. It's better to build a list of verts to update from the PBVH nodes.
👍 1
Joseph Eagar commented 2023-05-01 00:27:39 +02:00
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The list doesn't have to be unique btw, there's no point going through the effort to eliminate duplicates.

The list doesn't have to be unique btw, there's no point going through the effort to eliminate duplicates.
Hans Goudey commented 2023-05-01 01:50:23 +02:00
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Well, since a face usually has four corners, not de-duplicating will mean we have to do 4x the calculations, for both vertices and faces. I didn't benchmark it yet, but I'll bet using VectorSet to de-duplicate is worth it here.

Well, since a face usually has four corners, not de-duplicating will mean we have to do 4x the calculations, for both vertices and faces. I didn't benchmark it yet, but I'll bet using `VectorSet` to de-duplicate is worth it here.
Joseph Eagar commented 2023-05-01 22:23:30 +02:00
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Hrm, you might be right.

Hrm, you might be right.
Hans Goudey added 2 commits 2023-04-30 22:06:31 +02:00
Hans Goudey requested review from Joseph Eagar 2023-04-30 22:13:03 +02:00
Julien Kaspar added the
Module
Sculpt, Paint & Texture
 label 2023-05-01 10:42:21 +02:00
Joseph Eagar requested changes 2023-05-01 22:19:16 +02:00
source/blender/blenkernel/intern/pbvh.cc Outdated
@ -1464,0 +1422,4 @@
}
},
[&]() {
update_tags.fill(false);
Joseph Eagar commented 2023-05-01 22:17:54 +02:00
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Use verts_to_update or the node unique verts to clear the update tags.

Use `verts_to_update` or the node unique verts to clear the update tags.
Hans Goudey added 2 commits 2023-05-01 22:31:31 +02:00
Hans Goudey requested review from Joseph Eagar 2023-05-01 22:31:42 +02:00
Hans Goudey added 1 commit 2023-05-09 01:54:40 +02:00
Joseph Eagar merged commit ac02f94caf into main 2023-05-09 22:36:37 +02:00
Julien Kaspar removed this from the Sculpt, Paint & Texture project 2023-05-15 17:23:05 +02:00
Howard Trickey referenced this issue from a commit 2023-05-29 02:51:41 +02:00
Merge in orign/main:
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Reference: blender/blender#107458
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