Joining meshes or realizing instances in geometry nodes removes custom normals data #91048

New Issue

Nis Wegmann · 2021-08-30T10:34:08+02:00

Nis Wegmann commented

2021-08-30 10:34:08 +02:00

System Information
Operating system: macOS Big Sur 11.5.2
Graphics card: Apple M1

Blender Version
Broken: 2.93 and 3.0 Alpha

Short description of error

Using the collection info node in geometry nodes destroys custom normals data when the geometry node modifier is applied (or when the project is exported).

Exact steps for others to reproduce the error

Apply the geometry node modifier on the "Dummy" object in the attached blender project. I've also included a video that shows the issue.collection_info_test.blend

collection_info_bug.mov

**System Information** Operating system: macOS Big Sur 11.5.2 Graphics card: Apple M1 **Blender Version** Broken: 2.93 and 3.0 Alpha **Short description of error** Using the collection info node in geometry nodes destroys custom normals data when the geometry node modifier is applied (or when the project is exported). **Exact steps for others to reproduce the error** Apply the geometry node modifier on the "Dummy" object in the attached blender project. I've also included a video that shows the issue.[collection_info_test.blend](https://archive.blender.org/developer/F10351823/collection_info_test.blend) [collection_info_bug.mov](https://archive.blender.org/developer/F10351825/collection_info_bug.mov)

Nis Wegmann commented

2021-08-30 10:34:08 +02:00

Added subscriber: @nis

Pratik Borhade commented

2021-08-30 11:42:07 +02:00

Added subscriber: @PratikPB2123

Philipp Oeser commented

2021-08-30 11:49:23 +02:00

Added subscribers: @HooglyBoogly, @JacquesLucke, @lichtwerk

Philipp Oeser commented

2021-08-30 11:49:23 +02:00

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Philipp Oeser commented

2021-08-30 11:49:23 +02:00

A bit will survive as attributes (but not really usable as-is):

@JacquesLucke : @HooglyBoogly : this would also be the same ballpark as {#89054}?
(though normals are not even stored into attributes...)

A bit will survive as attributes (but not really usable as-is): ![image.png](https://archive.blender.org/developer/F10351942/image.png) @JacquesLucke : @HooglyBoogly : this would also be the same ballpark as {#89054}? (though normals are not even stored into attributes...)

Hans Goudey commented

2021-08-30 18:30:08 +02:00

Yeah, we haven't looked into supporting custom normals in geometry nodes yet. They should be a vector attribute on the face corner domain, editable just like any other attribute. But I wouldn't expect it to work until then.

Hans Goudey changed title from ~~collection info node in geometry nodes destroys custom normals data~~ to Joining meshes or realizing instances in geometry nodes removes custom normals data

2021-09-06 05:55:51 +02:00

Hans Goudey commented

2021-09-06 05:57:52 +02:00

Until we decide how to handle custom normal data in geometry nodes, this situation is unlikely to change.
Theoretically it might not be complicated-- there could be a "Set Custom Normals' node that evaluates a vector field on the face corner domain. But that may require other changes or more design thought.

Until we decide how to handle custom normal data in geometry nodes, this situation is unlikely to change. Theoretically it might not be complicated-- there could be a "Set Custom Normals' node that evaluates a vector field on the face corner domain. But that may require other changes or more design thought.

Nis Wegmann commented

2021-09-06 12:49:55 +02:00

Sure. I find it a bit confusing though, that the normals are only destroyed the moment the geometry nodes modifier is baked down when hitting apply. If geometry nodes can't handle custom normals the logical thing would be to remove the custom normals as soon as the modifier is added to the object. Currently, the modifier behaves differently when it is applied (compared to how it works when it is attached) which feels buggy.

Festivity commented

2022-03-02 14:38:31 +01:00

Added subscriber: @Festivity

Philipp Oeser removed the

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Joining meshes or realizing instances in geometry nodes removes custom normals data #91048