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<p>In vtk I have exported a scene to .obj/.mtl using vtkOBJExporter. The vtkRenderWindow that is connected the vtkOBJExporter only contains 3 actors: two spheres and a cylinder (tube filter).</p>
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<p>I have been trying to open the obj in other software, but with varying luck. I have tried opening the file in Blender and meshlab where it fails (meshlab complains about "Bad texture coords index in face"). However, the file opens successfully in netfabb.</p>
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<p>On the other hand, if I union boolean (vtkBooleanOperationPolyDataFilter) the three polydata (2 spheres and cylinder) together, and create one actor for the resulting single polydata, the obj/mtl from that scene opens successfully in all three programs.</p>
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<p>Attached is the obj/mtl files that fail.</p>
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<p>What could be the issue here?</p>
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<p>Thanks<br>
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