importing fbx file with shape key that's less than 0 or greater than one #109124

New Issue

Nathan Meshcapade · 2023-06-19T14:34:15+02:00

Nathan Meshcapade commented

2023-06-19 14:34:15 +02:00

System Information
Operating system: windows 11
Graphics card: 3090 founders edition

Blender Version
Broken: I tried this on 3.5.1, 3.3.7 and 3.0.1. They all act the same.
Worked: not sure

Short description of error
If you import a .fbx file with a shape key that's less than 0, then the shape key value is set to 0. If the value is greater than one, then the incoming shape key is 1.

Exact steps for others to reproduce the error
Open the attached .blend file and look at it, it's a cube with a shape key on it. Export it as a .fbx, then import it into a new scene. You'll see that the newly imported .fbx doesn't look like the .blend file. Inspect the shape key min and max in the .blend file, vs the newly imported .fbx, and you'll see that the min value of the .fbx is clamped to 0, even though that's not the case in the .blend file.

Suggested solution in code
I tested this and it works. In this file: bin\Debug\4.0\scripts\addons\io_scene_fbx\import_fbx.py

I put this code right before kb.value = weight

        if weight > 1:
            kb.slider_max = 2 * weight

        if weight < 0:
            kb.slider_min = 2 * weight

I don't know enough about fbx files to know if you can read the min and max of a shape key out of it or not. The solution above is how (I percieve) maya handles this issue.

Thanks!

**System Information** Operating system: windows 11 Graphics card: 3090 founders edition **Blender Version** Broken: I tried this on 3.5.1, 3.3.7 and 3.0.1. They all act the same. Worked: not sure **Short description of error** If you import a .fbx file with a shape key that's less than 0, then the shape key value is set to 0. If the value is greater than one, then the incoming shape key is 1. **Exact steps for others to reproduce the error** Open the attached .blend file and look at it, it's a cube with a shape key on it. Export it as a .fbx, then import it into a new scene. You'll see that the newly imported .fbx doesn't look like the .blend file. Inspect the shape key min and max in the .blend file, vs the newly imported .fbx, and you'll see that the min value of the .fbx is clamped to 0, even though that's not the case in the .blend file. **Suggested solution in code** I tested this and it works. In this file: bin\Debug\4.0\scripts\addons\io_scene_fbx\import_fbx.py I put this code right before `kb.value = weight` ```Py if weight > 1: kb.slider_max = 2 * weight if weight < 0: kb.slider_min = 2 * weight ``` I don't know enough about fbx files to know if you can read the min and max of a shape key out of it or not. The solution above is how (I percieve) maya handles this issue. Thanks!

shape_key_error.blend

872 KiB

Nathan Meshcapade added the

labels 2023-06-19 14:34:15 +02:00

Pratik Borhade commented

2023-06-20 05:42:51 +02:00