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Geometry Nodes: use smooth normals in Distribute Points on Faces node #104414

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Jacques Lucke merged 13 commits from JacquesLucke/blender:smooth-normals-in-distribute-node into main 2023-02-11 13:26:01 +01:00
Conversation 2 Commits 13 Files Changed 4 +114 -29
Jacques Lucke commented 2023-02-07 18:07:59 +01:00
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Previously, the node used the "true" normal of every looptri. Now it uses the "loop normals" which includes e.g. smooth faces and custom normals. The true normal can still be used on the points by capturing it before the Distribute node.

We do intend to expose the smooth normals separately in geometry nodes as well, but this is an important first step.

It's also necessary to generate child hair between guide hair strands that don't have visible artifacts at face boundaries.

For perfect backward compatibility, the node still has a "Legacy Normal" option in the side bar. Creating the exact same behavior with existing nodes isn't really possible unfortunately because of the specifics of how the Distribute node used to compute the normals using looptris.

Previously, the node used the "true" normal of every looptri. Now it uses the "loop normals" which includes e.g. smooth faces and custom normals. The true normal can still be used on the points by capturing it before the Distribute node. We do intend to expose the smooth normals separately in geometry nodes as well, but this is an important first step. It's also necessary to generate child hair between guide hair strands that don't have visible artifacts at face boundaries. For perfect backward compatibility, the node still has a "Legacy Normal" option in the side bar. Creating the exact same behavior with existing nodes isn't really possible unfortunately because of the specifics of how the Distribute node used to compute the normals using looptris.
distribute_points_on_torus.mp4
573 KiB
hair_artifacts_with_true_normals.mp4
398 KiB
Jacques Lucke added 12 commits 2023-02-07 18:08:01 +01:00 
Differential Revision: https://developer.blender.org/D17109
Jacques Lucke requested review from Hans Goudey 2023-02-07 18:30:07 +01:00
Jacques Lucke requested review from Simon Thommes 2023-02-07 18:30:16 +01:00
Jacques Lucke commented 2023-02-07 18:30:57 +01:00
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@blender-bot build

@blender-bot build
Blender Bot commented 2023-02-07 18:30:57 +01:00
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Only blender organization members with write access can start builds. See documentation for details.

Only blender organization members with write access can start builds. See [documentation](https://projects.blender.org/infrastructure/blender-bot) for details.
Hans Goudey reviewed 2023-02-07 18:37:05 +01:00
source/blender/nodes/geometry/nodes/node_geo_distribute_points_on_faces.cc
@ -328,0 +347,4 @@
const MLoopTri &looptri = looptris[looptri_index];
const float3 &bary_coord = bary_coords[i];
const float3 &normal0 = corner_normals[looptri.tri[0]];
Hans Goudey commented 2023-02-07 18:37:05 +01:00
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I think this is simpler with sample_corner_attrribute_with_bary_coords. Better to use the abstractions like that so they can be recognized by the reader

I think this is simpler with `sample_corner_attrribute_with_bary_coords`. Better to use the abstractions like that so they can be recognized by the reader
JacquesLucke marked this conversation as resolved
Hans Goudey requested changes 2023-02-07 18:39:42 +01:00
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The code looks simple enough now. Just one suggestion inline. It might be nice to briefly describe why the corner normals are important for the hair use case in the commit message, the motivation isn't obvious without all the background right now.

The code looks simple enough now. Just one suggestion inline. It might be nice to briefly describe why the corner normals are important for the hair use case in the commit message, the motivation isn't obvious without all the background right now.
Jacques Lucke added 1 commit 2023-02-07 18:42:48 +01:00
Hans Goudey approved these changes 2023-02-07 19:27:21 +01:00
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Thanks, LGTM

Thanks, LGTM
Simon Thommes approved these changes 2023-02-11 12:49:58 +01:00
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Not gonna lie, I was confused for a second testing this on an existing file seeing it wouldn't work. Then I remembered I had to turn off the legacy toggle. Can confirm the versioning works.

I tested this a week ago already, not sure what changed in between but it looks good to me.

Not gonna lie, I was confused for a second testing this on an existing file seeing it wouldn't work. Then I remembered I had to turn off the legacy toggle. Can confirm the versioning works. I tested this a week ago already, not sure what changed in between but it looks good to me.
Jacques Lucke merged commit 0f708fa2e3 into main 2023-02-11 13:26:01 +01:00
Jacques Lucke deleted branch smooth-normals-in-distribute-node 2023-02-11 13:26:02 +01:00
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