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Maniphest T41686

Material Slot Bug
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Description

System Information
Windows 7 64, HD 5770

Blender Version
Broken: 9337574 (2.71 release) + 35bc266

Short description of error
Materials that are used by more than one object, but in different material slots:
(MeshA RedMaterial Slot1 + MeshB RedMaterial Slot 2)
disappear if they have any generate modifier assigned on its object.

There also seems to be a dependency if the faces are assigned to only one material or more than one.
I havent fully discovered the cause, but its easy to reproduce - please take a look in the file.

Exact steps for others to reproduce the error

MaterialDisappearsBug.blend644 KBDownload

  • Add a Cube
    • Give it a Array modifier.
    • Give it 2 Materials (use 2 different colors - more visible).
    • Assign some faces or whole mesh to Material 2.
  • Duplicate the Cube
    • Delete Slot 1 Material on Cube 2.

You now have Material2 in different slots:
Cube 1 = Slot 2
Cube 2 = Slot 1

  • Press P to start the Game Engine

Problem: Material 2 on Cube 1 doesnt show up.

The bug exists very long, i think over 3 years - finally i have found something.
Would be great if you can fix that.

Event Timeline

Karja Krähwald (karja) created this task.Sep 1 2014, 11:27 PM
Karja Krähwald (karja) raised the priority of this task from to 90.
Karja Krähwald (karja) updated the task description. (Show Details)
Karja Krähwald (karja) added projects: Game Engine, Modifiers.
Karja Krähwald (karja) edited a custom field.
Karja Krähwald (karja) added a subscriber: Karja Krähwald (karja).
Adam Friesen (ace_dragon) added a subscriber: Adam Friesen (ace_dragon).Sep 5 2014, 1:40 AM

The issue has existed since modifier support was first added (around Blender 2.49).

This doesn't happen all the time from my experience, but when it does happen you can usually fix it by applying the modifiers.

In general, applying the modifiers can also help the game run faster if it's done for larger objects.

I would generally see this as something that could use fixing, and it would be nice if it was resolved once and for all.

Sergey Sharybin (sergey) lowered the priority of this task from 90 to Normal.Sep 12 2014, 11:16 AM
Sergey Sharybin (sergey) added subscribers: Inês Almeida (brita_), Mitchell Stokes (moguri), Sergey Sharybin (sergey).

@Mitchell Stokes (moguri), @Inês Almeida (brita_), can you look into this report please?

Jorge Bernal (lordloki) closed this task as a duplicate of T24948: Modifiers make materials disappear in BGE.Jun 18 2015, 1:29 AM