How in VTK I read a .stl file and write to a .mha file

Question

Some example how to do the task in the subject? Preferable in Python.

I suppose that .stl is 3D surface image and .mha are a 3D Volume (3 dimension array of pixels (compressed?)). Some processing must be done in the middle (fill inside the surface).

Thanks,

Luis Gonçalves

mmusy · Answer 1 · 2020-06-14T14:31:19.060

1

You can check this example in vedo:

to save the volume add: write(v, 'vol.mhd')

edited Jun 14 '20 at 14:31

answered Mar 11 '20 at 12:59

mmusy

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How to convert a variable of the class vtkplotter.volume.Volume to a volume in VTK and also how to convert vtkplotter.mesh.Mesh to a mesh in VTK? Thanks. – Luis Gonçalves Mar 12 '20 at 15:33
They already are! try e.g. isinstance(vtkplotter.volume.Volume, vtk.vtkVolume) should give True Mesh is a vtkActor. You can get the vtk.vtkPolydata object with mesh.polydata() – mmusy Mar 12 '20 at 19:23
And if I want to convert the .stl to .mhd without volume fill? Only with the points of the surface. Are there some example? – Luis Gonçalves Mar 16 '20 at 15:07
MetaImage is only for volumetric data not polygonal data afaik. – mmusy Mar 16 '20 at 19:59

score 1 · Answer 2 · answered Mar 11 '20 at 17:46

Also you could try using VTK's PolyDataToImageDataStencil filter. That's presumably what vtkplotter is using underneath.

Here's a Python example using vtkPolyDataToImageStencil: https://lorensen.github.io/VTKExamples/site/Python/PolyData/PolyDataToImageDataStencil/

And here is the documentation for the class: https://vtk.org/doc/nightly/html/classvtkPolyDataToImageStencil.html

How in VTK I read a .stl file and write to a .mha file

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