WIP: ENH: Add OBJ option to the export scene dialog
This is a naive attempt at fixing #19683
Two issues left to solve:
- vtkOBJExporter doesn't find PolyDatas in the ParaView scene. vtk/vtk!6860 fixes this.
- vtkOBJExporter doesn't use SetFileName, but SetPrefix, to which it appends extensions. This currently results in
file.obj.obj
andfile.obj.mtl
when used with ParaView.