Geometry Nodes: non-deterministic material handling in Join Geometry node #85964

New Issue

Wouter Stomp · 2021-02-24T21:43:26+01:00

Wouter Stomp commented

2021-02-24 21:43:26 +01:00

System Information
Operating system: Darwin-20.2.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 5500M OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.2.13

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-23 23:15, hash: b2c7ea6d82
Worked: -

Short description of error
Adding a node sometimes randomly disables the material textures in the 3d view. So far this has happened with adding a transform node and attribute randomise node (last one unconnected). With the attached file, a reliable way to reproduce this is to duplicate the transform node and add it directly to the right of the original one. The only reliable way to undo this I have found so far is to mute and unmute the attribute fill node (undoing adding the just added node doesn't help).

Exact steps for others to reproduce the error
Donut geometry nodes.blend
Schermopname 2021-02-24 om 21.37.44.mov

**System Information** Operating system: Darwin-20.2.0-x86_64-i386-64bit 64 Bits Graphics card: AMD Radeon Pro 5500M OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.2.13 **Blender Version** Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-23 23:15, hash: `b2c7ea6d82` Worked: - **Short description of error** Adding a node sometimes randomly disables the material textures in the 3d view. So far this has happened with adding a transform node and attribute randomise node (last one unconnected). With the attached file, a reliable way to reproduce this is to duplicate the transform node and add it directly to the right of the original one. The only reliable way to undo this I have found so far is to mute and unmute the attribute fill node (undoing adding the just added node doesn't help). ![Schermafbeelding 2021-02-24 om 21.33.07.png](https://archive.blender.org/developer/F9836038/Schermafbeelding_2021-02-24_om_21.33.07.png) ![Schermafbeelding 2021-02-24 om 21.32.31.png](https://archive.blender.org/developer/F9836041/Schermafbeelding_2021-02-24_om_21.32.31.png) **Exact steps for others to reproduce the error** [Donut geometry nodes.blend](https://archive.blender.org/developer/F9836032/Donut_geometry_nodes.blend) [Schermopname 2021-02-24 om 21.37.44.mov](https://archive.blender.org/developer/F9836033/Schermopname_2021-02-24_om_21.37.44.mov)

Wouter Stomp commented

2021-02-24 21:43:26 +01:00

Added subscriber: @blenderrocket

blender-admin commented

2021-02-24 21:43:26 +01:00

#85956 was marked as duplicate of this issue

Jacques Lucke commented

2021-02-25 09:52:04 +01:00

Added subscriber: @SimonThommes

Jacques Lucke commented

2021-02-25 09:57:03 +01:00

Added subscribers: @HooglyBoogly, @JacquesLucke

Jacques Lucke commented

2021-02-25 09:57:03 +01:00

This is caused by the non-determinism in the Join Geometry node.. It is currently passing on the materials of the "first" input input (see BKE_mesh_copy_settings(new_mesh, first_input_mesh);). However, since there is the multi-input-socket "first" is not well defined anymore and my change arbitrarily.
I can think of two possible solutions (maybe both are necessary):

Have a deterministic input order internally.
Introduce proper material handling in Geometry Nodes. This is probably not something we can get around for long. So we might also just start working on it now.

This is caused by the non-determinism in the Join Geometry node.. It is currently passing on the materials of the "first" input input (see `BKE_mesh_copy_settings(new_mesh, first_input_mesh);`). However, since there is the multi-input-socket "first" is not well defined anymore and my change arbitrarily. I can think of two possible solutions (maybe both are necessary): * Have a deterministic input order internally. * Introduce proper material handling in Geometry Nodes. This is probably not something we can get around for long. So we might also just start working on it now.

Jacques Lucke commented

2021-02-25 09:57:12 +01:00

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

Jacques Lucke changed title from ~~Geometry Nodes: adding a node randomly disables materials in viewport~~ to Geometry Nodes: non-deterministic material handling in Join Geometry node

2021-02-25 09:57:49 +01:00

Charlie Jolly commented

2021-02-25 10:57:05 +01:00

Added subscriber: @CharlieJolly

Charlie Jolly commented

2021-02-25 10:57:05 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Charlie Jolly closed this issue

2021-02-25 10:57:05 +01:00

Charlie Jolly self-assigned this 2021-02-25 10:57:05 +01:00

Charlie Jolly commented

2021-02-25 10:57:05 +01:00

This comment was removed by @CharlieJolly

*This comment was removed by @CharlieJolly*

Charlie Jolly commented

2021-02-25 10:58:16 +01:00

Changed status from 'Resolved' to: 'Confirmed'

Charlie Jolly reopened this issue

2021-02-25 10:58:16 +01:00

Charlie Jolly commented

2021-02-25 10:58:16 +01:00

Accidentally resolved! Sorry!

Charlie Jolly removed their assignment 2021-02-25 10:58:36 +01:00

Jacques Lucke commented

2021-04-12 13:44:24 +02:00

Closed as duplicate of #87419

Jacques Lucke closed this issue

2021-04-12 13:44:24 +02:00

Jacques Lucke commented

2021-04-12 13:45:17 +02:00

The non determinism of the Join Geometry node has been resolved by making the multi-input-socket ordered.
However, there is another related bug: #87419.

The non determinism of the Join Geometry node has been resolved by making the multi-input-socket ordered. However, there is another related bug: #87419.

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Geometry Nodes: non-deterministic material handling in Join Geometry node #85964