fbx import error (vertex colors?) #104773

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sebbbb · 2023-07-25T10:18:58+02:00

sebbbb commented

2023-07-25 10:18:58 +02:00

System Information
Operating system: Windows 10
Graphics card: RTX 4090

Short description of error
FBX Import fails with error.

Exact steps for others to reproduce the error
When importing the attached FBX (exported from unreal) I get the following error:

Python: Traceback (most recent call last):
File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx_init_.py", line 207, in execute
if import_fbx.load(self, context, filepath=path, **keywords) == {'FINISHED'}:
File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx\import_fbx.py", line 3109, in load
_(); del _
File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx\import_fbx.py", line 3103, in _
root_helper.build_hierarchy(fbx_tmpl, settings, scene, view_layer)
File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx\import_fbx.py", line 2534, in build_hierarchy
child.build_hierarchy(fbx_tmpl, settings, scene, view_layer)
File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx\import_fbx.py", line 2521, in build_hierarchy
obj = self.build_node_obj(fbx_tmpl, settings)
File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx\import_fbx.py", line 2324, in build_node_obj
obj.color[0:3] = elem_props_get_color_rgb(fbx_props, b'Color', (0.8, 0.8, 0.8))
File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx\import_fbx.py", line 195, in elem_props_get_color_rgb
assert(elem_prop.props[1] == b'ColorRGB')
AssertionError

The file imports fine into maya so I don't think there's something wrong with it.

**System Information** Operating system: Windows 10 Graphics card: RTX 4090 **Short description of error** FBX Import fails with error. **Exact steps for others to reproduce the error** When importing the attached FBX (exported from unreal) I get the following error: Python: Traceback (most recent call last): File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx\__init__.py", line 207, in execute if import_fbx.load(self, context, filepath=path, **keywords) == {'FINISHED'}: File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx\import_fbx.py", line 3109, in load _(); del _ File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx\import_fbx.py", line 3103, in _ root_helper.build_hierarchy(fbx_tmpl, settings, scene, view_layer) File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx\import_fbx.py", line 2534, in build_hierarchy child.build_hierarchy(fbx_tmpl, settings, scene, view_layer) File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx\import_fbx.py", line 2521, in build_hierarchy obj = self.build_node_obj(fbx_tmpl, settings) File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx\import_fbx.py", line 2324, in build_node_obj obj.color[0:3] = elem_props_get_color_rgb(fbx_props, b'Color', (0.8, 0.8, 0.8)) File "C:\Program Files\Blender Foundation\Blender 3.6\3.6\scripts\addons\io_scene_fbx\import_fbx.py", line 195, in elem_props_get_color_rgb assert(elem_prop.props[1] == b'ColorRGB') AssertionError The file imports fine into maya so I don't think there's something wrong with it.

system-info.txt

27 KiB

Groundplane_SM.FBX

2.0 MiB

sebbbb added the

labels 2023-07-25 10:18:59 +02:00

Thomas Barlow commented

2023-07-26 02:38:25 +02:00

The Groundplane_SM model (Blender Object equivalent) in this .fbx has a KString type property named Color that is marked as a user property (b'U' in elem_prop.props[3]). Normally, Color is not a user property and would have the ColorRGB type.

I guess when reading properties such as Color, the importer should ignore any marked as user properties. There's probably a lot of places other properties are read that should have the same treatment of ignoring user properties.

This error can also be achieved by exporting from Blender an Object with a Custom Property called Color with the Custom Properties option of the exporter enabled, and then importing that .fbx back into Blender.

Groundplane_SM is a bit extra weird in that all its properties are marked as user properties, even those that I'm pretty sure shouldn't be, yet the other model in the file, UCX_Groundplane_SM, is normal. Another weird .fbx file from Unreal...

The `Groundplane_SM` model (Blender Object equivalent) in this .fbx has a `KString` type property named `Color` that is marked as a user property (`b'U' in elem_prop.props[3]`). Normally, `Color` is not a user property and would have the `ColorRGB` type. I guess when reading properties such as `Color`, the importer should ignore any marked as user properties. There's probably a lot of places other properties are read that should have the same treatment of ignoring user properties. This error can also be achieved by exporting from Blender an Object with a Custom Property called `Color` with the `Custom Properties` option of the exporter enabled, and then importing that .fbx back into Blender. `Groundplane_SM` is a bit extra weird in that all its properties are marked as user properties, even those that I'm pretty sure shouldn't be, yet the other model in the file, `UCX_Groundplane_SM`, is normal. Another weird .fbx file from Unreal...

sebbbb commented

2023-07-26 11:12:03 +02:00

Thanks for looking into this :) Would it maybe be possible to set the color to the default if the value is malformed, instead of erroring out?

Thomas Barlow referenced a pull request that will close this issue

2023-08-06 17:18:55 +02:00

Fix #104773: FBX import fails when custom property name matches an expected non-custom property #104821

Pratik Borhade commented

2023-08-08 06:43:37 +02:00

yes, can confirm the assert when user property matches the label of FBX property.

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Pratik Borhade added

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