Geometry of external objects loses its attributes after subdivision #85691

New Issue

Simon Thommes · 2021-02-16T12:06:32+01:00

Simon Thommes commented

2021-02-16 12:06:32 +01:00

Geometry that is referenced in the node tree via Object Info or Collection info node loses its attribute information if there is a subdivision surface modifier on the object.

Doing the subdivision in the nodetree itself results not in the complete loss but in artifacts, as newly generated vertices seem get initialized with 0 instead of interpolated.
(This is a separate issue, addressed in #85697)

subdiv_attribute_lost-2021-02-16_11.53.40.mp4

subdiv_attribute_lost.blend

Geometry that is referenced in the node tree via Object Info or Collection info node loses its attribute information if there is a subdivision surface modifier on the object. Doing the subdivision in the nodetree itself results not in the complete loss but in artifacts, as newly generated vertices seem get initialized with 0 instead of interpolated. (This is a separate issue, addressed in #85697) [subdiv_attribute_lost-2021-02-16_11.53.40.mp4](https://archive.blender.org/developer/F9807921/subdiv_attribute_lost-2021-02-16_11.53.40.mp4) [subdiv_attribute_lost.blend](https://archive.blender.org/developer/F9807920/subdiv_attribute_lost.blend)

Simon Thommes commented

2021-02-16 12:06:32 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Simon Thommes commented

2021-02-16 12:06:32 +01:00

Added subscriber: @SimonThommes

blender-admin commented

2021-02-16 12:06:32 +01:00

#87441 was marked as duplicate of this issue

Simon Thommes changed title from ~~Attributes of external objects lose their attributes after subdivision~~ to Geometry of external objects loses its attributes after subdivision

2021-02-16 12:07:04 +01:00

Simon Thommes commented

2021-02-16 12:20:16 +01:00

Added subscriber: @eyecandy

Jacques Lucke commented

2021-04-16 09:10:21 +02:00

Added subscribers: @Ace_Dragon, @mano-wii

Jacques Lucke commented

2021-04-16 10:23:04 +02:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2021-04-16 10:23:04 +02:00

Turns out, 3e87d8a431 already "fixed" it for vertex groups with the change in object_update.c. Looks like they went for the dirty route of never automatically deleting vertex groups automatically. I guess the main case where this would be bad is when there is a character with a larger number of vertex groups which is subdivided after the armature modifier.

Given that this is fixed for vertex groups now, the other task I merged is not actually a duplicate anymore. I wonder if the real solution would be to never delete custom data layers by default and to leave this as a responsibility for the artist for scene optimization.

Turns out, 3e87d8a431 already "fixed" it for vertex groups with the change in `object_update.c`. Looks like they went for the dirty route of never automatically deleting vertex groups automatically. I guess the main case where this would be bad is when there is a character with a larger number of vertex groups which is subdivided after the armature modifier. Given that this is fixed for vertex groups now, the other task I merged is not actually a duplicate anymore. I wonder if the real solution would be to never delete custom data layers by default and to leave this as a responsibility for the artist for scene optimization.

blender-admin commented

2021-04-16 11:23:28 +02:00

This issue was referenced by 382b06c80c

This issue was referenced by 382b06c80cacb0ee940f2783f4619580b04aa502

Jacques Lucke commented

2021-04-16 11:28:58 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Jacques Lucke closed this issue

2021-04-16 11:28:58 +02:00

Jacques Lucke self-assigned this 2021-04-16 11:28:58 +02:00

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Geometry of external objects loses its attributes after subdivision #85691