[vtkusers] Why does the OBJ (WaveFront) Exporter only take vtkRenderWindow as input?

[Ken Martin]

I believe it is because OBJ files often go with MTL files and we need the
actor/properties to write out the materials. Exporters in VTK are designed
to write our a scene which can include positions, textures, material
properties, etc.  I think there is a vtkOBJWriter class that may be more in
line with what you are suggesting.

On Tue, Jun 19, 2018 at 4:26 PM vtk user <vtk_user at gmx.de> wrote:

> Hello vtk users,
>
> I was asking myself why the vtkOBJExporter has the methods
> SetInput(vtkRenderWindow *renWin) and SetRenderWindow(vtkRenderWindow
> *renWin), but no simple SetInputData(vtkPolyData *poly). As far as I
> checked, WaveFront also only stores geometries (like STLs) and no contexts,
> please correct me if I am wrong. So why the detour?
>
> Thanks alot!
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-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
101 East Weaver Street
Carrboro, North Carolina
27510 USA

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