FBX Exporting Animated Curve Modifier Incorrectly #66447

New Issue

Neil Macneale · 2019-07-04T21:25:41+02:00

Neil Macneale commented

2019-07-04 21:25:41 +02:00

System Information
Operating system: Arch linux
Graphics card: GTX 1060

Blender Version
Broken: 2.80, bbb3500c97, master, 2019-06-30; Same issue on 2.79b

Short description of error
When exporting an animation to the .fbx format, if you animate a curve modifier, you need to move that object to make it appear to follow the curve. When importing the fbx, the model does not follow the track but instead just moves in that direction. I know that an object constraint exists for the same purpose, but I cannot get that to work with an array modifier.

Exact steps for others to reproduce the error

Create curve and model
Add curve modifier to model
Animate the position, as seen here: bug_report_fbx.blend
Export as fbx, default settings
Import as fbx, as shown here: bug_report_fbx_imported.blend

As you can see, the animation does not work at all.

**System Information** Operating system: Arch linux Graphics card: GTX 1060 **Blender Version** Broken: 2.80, bbb3500c9716, master, 2019-06-30; Same issue on 2.79b **Short description of error** When exporting an animation to the .fbx format, if you animate a curve modifier, you need to move that object to make it appear to follow the curve. When importing the fbx, the model does not follow the track but instead just moves in that direction. I know that an object constraint exists for the same purpose, but I cannot get that to work with an array modifier. **Exact steps for others to reproduce the error** 1) Create curve and model 2) Add curve modifier to model 3) Animate the position, as seen here: [bug_report_fbx.blend](https://archive.blender.org/developer/F7566842/bug_report_fbx.blend) 4) Export as fbx, default settings 5) Import as fbx, as shown here: [bug_report_fbx_imported.blend](https://archive.blender.org/developer/F7566843/bug_report_fbx_imported.blend) As you can see, the animation does not work at all.

Neil Macneale commented

2019-07-04 21:25:41 +02:00

Added subscriber: @macmv

Neil Macneale commented

2019-07-05 00:21:06 +02:00

I was able to get around this issue by applying the array modifier on my object and writing a python script to add the object constraint to all the newly created objects, rather than using the curve modifier. The animation now exports correctly with the follow path object constraint.

Sebastian Parborg commented

2019-07-05 12:05:17 +02:00

Added subscribers: @mont29, @ZedDB

Sebastian Parborg commented

2019-07-05 12:05:17 +02:00

@mont29 is this something we support with the .fbx exporter?

Bastien Montagne was assigned by Sebastian Parborg

2019-07-05 12:05:30 +02:00

Bastien Montagne commented

2019-07-05 12:10:26 +02:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2019-07-05 12:10:26 +02:00

Bastien Montagne commented

2019-07-05 12:10:26 +02:00

Curve modifier deforms (and animate) the geometry of the object, this is absolutely not supported by FBX (in general). We can only export Object-level animation, modifiers are always just applied statically (with the exception of the Armature one, for which we can craft some conversion to FBX Skeletton system). Thanks for the report, but this simply cannot be done with FBX.

Curve modifier deforms (and animate) the geometry of the object, this is absolutely not supported by FBX (in general). We can only export *Object*-level animation, modifiers are always just applied statically (with the exception of the Armature one, for which we can craft some conversion to FBX Skeletton system). Thanks for the report, but this simply cannot be done with FBX.

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FBX Exporting Animated Curve Modifier Incorrectly #66447