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This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

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I build a Vtk pipeline containing a vtkContourFilter containing 11 values and a color LUT scaled to the range of the input data. But, in my output '.OBJ' file, or '.IV' I see one color -- WHITE.

I export the vtkContourFilter output Wavefront '.OBJ' as follows:

vtkOBJExporter objxport objxport SetInput renWin objxport SetFilePrefix $outFilePrefix objxport Write

When I add: renWin Render I see a nice picture of my rainbow-colored set of iso-surfaces

vtkOBJExporter also exports a $outFilePrefix.mtl file, containing rendering attributes for the polygon geometry stored in the $outFilePrefix.obj file I am expecting, in my output $outFilePrefix.mtl, I see:

wavefront mtl file written by the visualization toolkit

newmtl mtl1 Ka 1 1 1 Kd 1 1 1 Ks 1 1 1 Ns 1 Tf 0.4 0.4 0.4 illum 3

I see one material with opacity 0.6, as I specified, but -- WHITE. In $outFilePrefix.obj, there is one group, g grp1 and one material reference, usemtl mtl1.

I see similar results using vtkIVExporter.

Thank you!