"Collection Info" Geometry Node not Transfering Instance-level Named Attributes #98807

New Issue

Tyler B. · 2022-06-12T01:44:15+02:00

Tyler B. commented

2022-06-12 01:44:15 +02:00

System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: GeForce GTX 1060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 399.01

Blender Version
Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: e05e1e3691

Short description of error
The "Collection Info" node doesn't transfer the named attributes(blender 3.2+) from the source geometry to the "geometry" output.

Additional Explorations:
- The source collection can be in any scene
- The "Attribute" shader node doesn't recognize instance-level attributes(see attached material) yet works after the geometry is realized
- The "Reset Children" collection info node option has no effect

Exact steps for others to reproduce the error

Load the attached .blend file

The link marked "no attributes" doesn't have instance-domain named attributes set by the objects in the collection while the link marked "yes attributes" has those attributes, but under the vertex domain.instance_attributes_bug.blend

**System Information** Operating system: Windows-10-10.0.19043-SP0 64 Bits Graphics card: GeForce GTX 1060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 399.01 **Blender Version** Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: `e05e1e3691` **Short description of error** The "Collection Info" node doesn't transfer the named attributes(blender 3.2+) from the source geometry to the "geometry" output. Additional Explorations: - The source collection can be in any scene - The "Attribute" shader node doesn't recognize instance-level attributes(see attached material) yet works after the geometry is realized - The "Reset Children" collection info node option has no effect **Exact steps for others to reproduce the error** 1. Load the attached .blend file The link marked "no attributes" doesn't have instance-domain named attributes set by the objects in the collection while the link marked "yes attributes" has those attributes, but under the vertex domain.[instance_attributes_bug.blend](https://archive.blender.org/developer/F13147624/instance_attributes_bug.blend) ![source.png](https://archive.blender.org/developer/F13147625/source.png) ![yes_attributes.png](https://archive.blender.org/developer/F13147626/yes_attributes.png) ![no_attributes.png](https://archive.blender.org/developer/F13147627/no_attributes.png)

Tyler B. commented

2022-06-12 01:44:15 +02:00

Added subscriber: @42xnor

Iliya Katushenock commented

2022-06-12 11:45:39 +02:00

Added subscriber: @mod_moder

Iliya Katushenock commented

2022-06-12 11:45:39 +02:00

Hello, thanks for the report.
Since attributes can be inherited from collections:
Instances named attribute test 1-1-1.blend
Also, for rendering, now the attributes of the instances are not transmitted.
We can conclude that your problem is that the instances you get are not the ones you create.
The reason is that all objects turn into instances. Everything, even your instances, turn into others.
Also, I'm not sure if the child attributes can be retrieved by the parent.
And for you now the problem is that there is no way to get the descendants of the obtained instances.
There is a project for this now,
https://developer.blender.org/D14064
but this report looks like a feature request.

Hello, thanks for the report. Since attributes can be inherited from collections: [Instances named attribute test 1-1-1.blend](https://archive.blender.org/developer/F13149996/Instances_named_attribute_test_1-1-1.blend) Also, for rendering, now the attributes of the instances are not transmitted. We can conclude that your problem is that the instances you get are not the ones you create. The reason is that all objects turn into instances. Everything, even your instances, turn into others. Also, I'm not sure if the child attributes can be retrieved by the parent. And for you now the problem is that there is no way to get the descendants of the obtained instances. There is a project for this now, https://developer.blender.org/D14064 but this report looks like a feature request.

Germano Cavalcante commented

2022-06-14 16:27:09 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2022-06-14 16:27:09 +02:00

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

Germano Cavalcante commented

2022-06-14 16:27:09 +02:00

If I understand the problem correctly, the instances that have the attributes generated are "children" of the instances generated with the node "Collection Info".
But apparently we can't read these attributes, as it is not possible to retrieve the instances generated in the other tree.

But maybe I'm wrong.

I'm not too familiar to tell if it's a bug or not.
Needs Information from Developers

If I understand the problem correctly, the instances that have the attributes generated are "children" of the instances generated with the node "Collection Info". But apparently we can't read these attributes, as it is not possible to retrieve the instances generated in the other tree. But maybe I'm wrong. I'm not too familiar to tell if it's a bug or not. Needs Information from Developers

Tyler B. commented

2022-06-24 18:39:52 +02:00

This is my understanding of the data flow after reading Moder's comment:
{F13226584 size=full}
Please let me know if I am wrong.
If this is right, why is "realize instances" going overboard and doing realization 2 levels deep, transferring the attributes to the vertex domain?

This is my understanding of the data flow after reading Moder's comment: {[F13226584](https://archive.blender.org/developer/F13226584/responce_data.png) size=full} Please let me know if I am wrong. If this is right, why is "realize instances" going overboard and doing realization 2 levels deep, transferring the attributes to the vertex domain?

Tyler B. commented

2022-07-13 01:17:49 +02:00

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

Tyler B. closed this issue

2022-07-13 01:17:49 +02:00

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"Collection Info" Geometry Node not Transfering Instance-level Named Attributes #98807