Exporting to fbx gives a completely messed up mesh and bones

[tomkimsour]

I imported my urdf, rescaled the meshes and move two of them to the correct position because there is an error in the urdf. Afterwards I selected the meshes and armature to export it in fbx with the default values.

On the right is the armature from my import and on the left is the one from the exported fbx file.

Hierarchically, the armature makes sense, however some axes are in the wrong direction and some were even added.