[vtkusers] Exporting RGB Polydata to .OBJ or .PLY

kenichiro yoshimi rccm.kyoshimi at gmail.com
Sat Dec 8 05:00:50 EST 2018


You can use the vtkX3DExporter or vtkVRMLExporter to export VTK scene
and render the meshes and colors in blender.

2018年12月7日(金) 3:13 Radosław Furmaniak <rastor.ragereaver at gmail.com>:
> Hello,
> I have set up PolyData and added 4 component scalar array to it. When I create PolyDataMapper, set scalar visibility and add actor to the scene, all colors are rendered properly.
> However, I have a problem with exporting this scene or just the polydata to the .OBJ (+mtl) file or to the .PLY. When I open it up in Blender, geometry is exported correctly, however OBJ is created all white, and .PLY has a single, grayish color (apart from the shadows of course), which I don't think is even present in input PolyData.
> I am trying to do it like this:
> plyWriter = vtk.vtkPLYWriter()
> plyWriter.SetInputData(polydata)
> plyWriter.SetFileTypeToBinary()
> plyWriter.SetDataByteOrderToLittleEndian()
> plyWriter.SetArrayName("Scalars")
> plyWriter.SetFileName("model.ply")
> plyWriter.Write()
> I have also tried setting up different color modes in plyWriter,
>  but the results are always the same.
> Scalar array is set up like this:
> scalarArray = vtk.vtkDoubleArray()
> scalarArray.SetNumberOfComponents(4)
> scalarArray.SetName("Scalars")
> polydata.GetPointData().AddArray(scalarArray)
> polydata.GetPointData().SetActiveScalars("Scalars")
> (I am omitting the part where I am actually setting elements of this array)
> I have also tried using the OBJExporter:
> writer = vtk.vtkOBJExporter()
> writer.SetFilePrefix(output_prefix)
> writer.SetInput(renWin)
> writer.Write()
> where renWin is rendering window with a single actor made from polydata mentioned above.
> I am using Python 3.6 and VTK 8.1.1.
> Any help how to export geometry and colors, so they can be reused in other programs?
> Thanks in advance.
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