FBX exporter does not properly pack texture used in material if the texture node is not directly connected to the bsdf #115019

New Issue

T-112 · 2023-11-16T23:32:42+01:00

T-112 commented

2023-11-16 23:32:42 +01:00

System Information
Operating system: macOS-13.6-arm64-arm-64bit 64 Bits
Graphics card: Metal API Apple M1 Pro 1.2

Blender Version
Broken: version: 4.0.0, branch: blender-v4.0-release, commit date: 2023-11-13 17:26, hash: 878f71061b8e
Worked: (unknown)

Short description of error
It seems that if the texture used is not directly connected to the Base Color of the PrincipledBSDF node, FBX export will not include the texture (even when set to copy and packed)

Exact steps for others to reproduce the error

Download sample gltf from PolyHaven: https://polyhaven.com/a/gray_rocks
Import into default scene
Add a Color Mix node between the albedo texture and the Base Color socket for the PrincipledBSDF
Export FBX with Path Mode set to "Copy" and the pack checkbox checked
Try importing the FBX back into Blender (or Maya)

**System Information** Operating system: macOS-13.6-arm64-arm-64bit 64 Bits Graphics card: Metal API Apple M1 Pro 1.2 **Blender Version** Broken: version: 4.0.0, branch: blender-v4.0-release, commit date: 2023-11-13 17:26, hash: `878f71061b8e` Worked: (unknown) **Short description of error** It seems that if the texture used is not directly connected to the Base Color of the PrincipledBSDF node, FBX export will not include the texture (even when set to copy and packed) **Exact steps for others to reproduce the error** - Download sample gltf from PolyHaven: https://polyhaven.com/a/gray_rocks - Import into default scene - Add a Color Mix node between the albedo texture and the Base Color socket for the PrincipledBSDF - Export FBX with Path Mode set to "Copy" and the pack checkbox checked - Try importing the FBX back into Blender (or Maya)

fbx_export_texture_bug.fbx

5.5 MiB

fbx_export_texture_bug.blend

14 MiB

T-112 added the

labels 2023-11-16 23:32:43 +01:00

Pratik Borhade commented

2023-11-17 05:32:59 +01:00

Hi, thanks for the report. Can confirm. Though this seems related to blender/blender-addons#96538 and a bug is within add-on's code so best to report this at: https://projects.blender.org/blender/blender-addons/issues

Hi, thanks for the report. Can confirm. Though this seems related to https://projects.blender.org/blender/blender-addons/issues/96538 and a bug is within add-on's code so best to report this at: https://projects.blender.org/blender/blender-addons/issues

Pratik Borhade closed this issue

2023-11-17 05:33:01 +01:00

Blender Bot added

and removed

labels 2023-11-17 05:33:03 +01:00

Thomas Barlow commented

2023-11-17 15:04:23 +01:00

FBX uses https://docs.blender.org/manual/en/4.0/addons/import_export/node_shaders_info.html (PrincipledBSDFWrapper in scripts/modules/bpy_extras/node_shader_utils.py in this repository), which does not support Color Mix nodes, so I'm not sure this would be considered a bug.

FBX uses https://docs.blender.org/manual/en/4.0/addons/import_export/node_shaders_info.html (`PrincipledBSDFWrapper` in `scripts/modules/bpy_extras/node_shader_utils.py` in this repository), which does not support Color Mix nodes, so I'm not sure this would be considered a bug.

T-112 commented

2023-11-17 18:45:07 +01:00

@Mysteryem I guess it is more of a limitation, but it is not at all obvious that data is lost until you open the exported file since there are no errors or warnings. Also, my example doesn't show this, but the gltf importer does generate materials that have Color Mix nodes etc. sometimes, and those would then fail to export properly.

T-112 referenced this issue from blender/blender-addons

2023-11-17 18:49:56 +01:00

FBX exporter does not properly pack texture used in material if the texture node is not directly connected to the bsdf #105010

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FBX exporter does not properly pack texture used in material if the texture node is not directly connected to the bsdf #115019