Line Art doesn't exclude object's instanced by geo node #103509
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Reference: blender/blender#103509
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System Information
Operating system: Linux-6.0.6-76060006-generic-x86_64-with-glibc2.35 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 510.108.03
Blender Version
Broken: version: 3.3.1, branch: master, commit date: 2022-10-04 18:35, hash:
b292cfe5a9Broken: version: 3.5.0 Alpha, branch: master, commit date: 2022-12-27 16:50, hash:
d7dad425c0Short description of error
Collection Line Art includes instances that are distribute my geometry nodes, even if that object is not within the Line Art target collection.
Line_art_Geo_Nodes_instance_bug.blend
Exact steps for others to reproduce with example file
Exact steps for others to reproduce the error from Startup
Added subscriber: @TinyNick
Added subscriber: @mod_moder
Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'
In this video i get differnds results for instances of same geometry
{F14097412}
While this may not be related to the report...
@TinyNick Hello. Is this problem still relevant?
@mod_moder Hello, thank you for following up. This seems to be an issue on these versions
5429ce1e0ad39eee008691f3Also I was wondeing what you meant by this? "Main problem is that you input 2 icosphere at single transforms" I didn't understand.
@TinyNick
I understand now, you meant that there where two spheres being instances to the same location by the geo nodes setup. Yes setting this geo node setup to pick instances helps with this, but does not solve the root issue
If Line Art is set to a single collection i shouldnt be seeing intersections on other collections regardless of their setup as shown in your video. I am finding this to be a limiting factor working with line art in a complex scene.
Is this a request for a new function?
You always can just realize instances
No, I am just requesting the current bug to be solved.
Line Art filtered to a Collection doesnt work properly if your scene contains geo nodes instances.
Collection filter is an existing feature, so this is not a new feature request.
Additionally I am not sure if realizing the instances is an appropiate work-around.
@ChengduLittleA
Can confirm. @ChengduLittleA , can you check?
Hi @TinyNick I just got around, will check.
I think the issue I found is that I'm using
BKE_collection_has_object(c, (Object *)(ob->id.orig_id))to check if a collection has the instance, and in this case, the instanced object seems to have become a child under the shown collection and not the original one...The collection/instance filtering has long since being a problem, the last time we faced with this problem is when we are trying to distinguish particle objects and allowing them to be excluded for calculation when there are too many in number. We didn't specifically treat geometry nodes- produced objects differently. The best thing we can hope for right now is GN-based line art where you can always input/filter exactly what geometries you need.
@ChengduLittleA Thank u for the detail that makes sense. We will have to wait for the new line art then.
A work-around that works today is t only use Object Line Art, incase anyone is also having this issue. I was able to get the results I need by tediously adding a Line Art for every object in the scene individually.
It's really not ideal to do it that way... Yeah it's kinda weird because the "particle" now comes from another collection. Somehow this depends on your interpretation on "what belongs to this collection" but I can see this will definitely create some problems when styling the object...