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Maniphest T100846

Problems with materials nodes in Alpha Trees
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Description

System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.15

Blender Version
Broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-09-04 04:25, hash: rB0ff920b77779
Worked: version: 3.4.0 Alpha, branch: master, commit date: 2022-08-14 18:40, hash: 659b63751d63

Loaded materials of the Alpha Trees addon are not correct
When opening an existing file with the Alpha Trees addon loaded and visible, there is a noticeable problem with colours. Maybe it's due to some MixRGB or Hue/Saturation node having a bug.

Exact steps for others to reproduce the error
Add a plane, scatter Alpha Trees, reduce saturation and open with a new version.

untitled.blend19 MBDownload

Revisions and Commits

rB Blender
D16025rB680fa8a523e0 Fix T100846: Bump blender file min version for forward compatibility warning

Related Objects

Event Timeline

Stefano Toneatto (stefanotoneatto) created this task.Sep 6 2022, 8:03 AM
Pratik Borhade (PratikPB2123) added a project: Render & Cycles.Sep 6 2022, 8:51 AM
Pratik Borhade (PratikPB2123) added a subscriber: Pratik Borhade (PratikPB2123).
Charlie Jolly (charlie) added a subscriber: Charlie Jolly (charlie).Sep 6 2022, 3:59 PM
Germano Cavalcante (mano-wii) changed the task status from Needs Triage to Needs Information from User.Sep 6 2022, 5:12 PM
Germano Cavalcante (mano-wii) added a subscriber: Germano Cavalcante (mano-wii).

I can confirm the issue.

rBbfa0ee13d539: Node: Mix node is the first "bad" commit.

But the file is too complex and too time consuming for us to track down (and determine if it's really a bug or a temporary indeterminate behavior).

We require the bug reporter to narrow down the problem.

Normally .blend files can be simplified by removing most objects and disabling settings, until the problem reveals itself more clearly.

Charlie Jolly (charlie) added a comment.EditedSep 6 2022, 5:44 PM

Original bug report file opens in both 3.2 and 3.4 alpha with red undefined node in montagne material

This file created in 3.2 opens fine in 3.4 alpha

node_mix_bug.blend827 KBDownload

As @Germano Cavalcante (mano-wii) stated it is difficult to track down the issue in the original bug report file.

It seems related to the new Mix Node but it's unclear where or how the bug has happened.

Saving a 3.4 file with the new node will not be forward compatible with 3.2.

3.4 is in alpha so please be careful with any important or production files.

Pratik Borhade (PratikPB2123) added a comment.Sep 17 2022, 4:27 AM

@Stefano Toneatto (stefanotoneatto), Any updates?

Stefano Toneatto (stefanotoneatto) added a comment.Sep 17 2022, 7:03 AM

No, the problem is still in 3.4.0-alpha+master.e108d67635a0-windows.amd64-release.

Pratik Borhade (PratikPB2123) added a comment.Sep 17 2022, 7:17 AM

@Stefano Toneatto (stefanotoneatto) yes, it's still replicable. But as Germano said, we need reporter to simplify the file.
At the moment its quite difficult to investigate with larger node-tree

In T100846#1413117, @Germano Cavalcante (mano-wii) wrote:

But the file is too complex and too time consuming for us to track down (and determine if it's really a bug or a temporary indeterminate behavior).
We require the bug reporter to narrow down the problem.
Normally .blend files can be simplified by removing most objects and disabling settings, until the problem reveals itself more clearly.

Charlie Jolly (charlie) closed this task as Resolved by committing rB680fa8a523e0: Fix T100846: Bump blender file min version for forward compatibility warning.Sep 22 2022, 6:09 PM
Charlie Jolly (charlie) claimed this task.
Charlie Jolly (charlie) added a commit: rB680fa8a523e0: Fix T100846: Bump blender file min version for forward compatibility warning.
Charlie Jolly (charlie) added a comment.Sep 22 2022, 6:31 PM

@Stefano Toneatto (stefanotoneatto) this report was closed automatically by the commit for forward compatibility -- see rB680fa8a523e0

The patch will not fix files that are opened and saved in older versions of Blender.