FBX exporter mixes up the material IDs when there are empty material slots #101724

New Issue

Soeren Schmidt-Clausen · 2022-10-10T14:02:19+02:00

Soeren Schmidt-Clausen commented

2022-10-10 14:02:19 +02:00

System Information
Operating system: Windows 10
Graphics card: i3-8100 3.60Ghz

Blender Version
Broken: (3.3.1, 3.4.0 Alpha, ..., I dont think this is version specific)

Addon Information
Name: FBX format (4, 36, 3)
Author: Campbell Barton, Bastien Montagne, Jens Restemeier

Short description of error

When exporting a mesh as FBX and it has an empty material slot is between two Materials, which are assigned to the mesh, blender mixes up the assignment. Probably because it removes the empty material slot. This also occurs when a mesh is assigned to the empty material slot.

The Obj Exporter on the other hand handles this case correctly. When there is no mesh assigned to the Material the exporter deletes the slots but conserves the IDs. And then there is a mesh assigned to the empty slot it create a new material to preserve the assignment.

Exact steps for others to reproduce the error

Open the File and export the "base mesh" object as FBX or OBJ. Then reimport them as FBX or OBJ.

fbx export bug.blend

**System Information** Operating system: Windows 10 Graphics card: i3-8100 3.60Ghz **Blender Version** Broken: (3.3.1, 3.4.0 Alpha, ..., I dont think this is version specific) **Addon Information** Name: FBX format (4, 36, 3) Author: Campbell Barton, Bastien Montagne, Jens Restemeier **Short description of error** When exporting a mesh as FBX and it has an empty material slot is between two Materials, which are assigned to the mesh, blender mixes up the assignment. Probably because it removes the empty material slot. This also occurs when a mesh is assigned to the empty material slot. The Obj Exporter on the other hand handles this case correctly. When there is no mesh assigned to the Material the exporter deletes the slots but conserves the IDs. And then there is a mesh assigned to the empty slot it create a new material to preserve the assignment. **Exact steps for others to reproduce the error** Open the File and export the "base mesh" object as FBX or OBJ. Then reimport them as FBX or OBJ. [fbx export bug.blend](https://archive.blender.org/developer/F13648449/fbx_export_bug.blend)

Soeren Schmidt-Clausen commented

2022-10-10 14:02:19 +02:00

Added subscriber: @F_Scociety

Omar Emara changed title from ~~FBX exporter mixes up the material ID's in some cases~~ to FBX exporter mixes up the material IDs when there are empty material slots

2022-10-10 16:33:55 +02:00

Omar Emara commented

2022-10-10 16:33:55 +02:00

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

Thomas Barlow commented

2023-03-09 01:53:14 +01:00

I think this is a duplicate of #75982 which was resolved recently.

I think this is a duplicate of https://projects.blender.org/blender/blender-addons/issues/75982 which was resolved recently.

Soeren Schmidt-Clausen closed this issue

2023-03-14 12:18:10 +01:00

Blender Bot added

and removed

labels 2023-03-14 12:18:12 +01:00

Soeren Schmidt-Clausen commented

2023-03-14 12:18:42 +01:00

I think this is a duplicate of #75982 which was resolved recently.

Yeah youre right. I closed it

> I think this is a duplicate of https://projects.blender.org/blender/blender-addons/issues/75982 which was resolved recently. Yeah youre right. I closed it

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FBX exporter mixes up the material IDs when there are empty material slots #101724