I have a 3D matrix data from a txt file representing voxels. I already represented them in vtk as a structured grid:
grid = vtk.vtkExplicitStructuredGrid()
Everything working fine. Adding color functions, actors, renderer, window... But now I want to save it as a .vtk file to read it with other applications and I don't know how. I tried:
exporter = vtk.vtkVRMLExporter()
exporter.SetRenderWindow(window)
exporter.SetFileName("sample.vtk")
exporter.Write()
exporter.Update()
But it creates a file almost empty, just with metadata and not voxels data. I tried change it for: vtkVTKExporter and didn't work too.
I also tried to use other functions calling the "grid" but didn't even created the file:
vtkXMLUnstructuredGridWriter
vtkXMLPolyDataWriter
vtkXMLUnstructuredGridWriter
And finally I tried to use:
writer = vtk.vtkStructuredPointsWriter()
windowto_image_filter = vtk.vtkWindowToImageFilter()
windowto_image_filter.SetInput(window)
windowto_image_filter.SetScale(1) # image quality
windowto_image_filter.SetInputBufferTypeToRGBA()
writer.SetFileName('sample2.vtk')
writer.SetInputConnection(windowto_image_filter.GetOutputPort())
writer.Write()
But leads to an error.
Is there a way to save it as a .vtk file in binary with all the represented information? And also, is there a way to save the image in the vtk window created as a .jpg or .png like a screenshot. Thanks!
Saving grid with data: use a writer (exporter are mean to save "what is visible now", and not the underlying data).
With vtkStructuredGrid, use vtkXMLStructureGridWriter to have a .vts file, or vtkDataSetWriter to produce legacy .vtk file.
Then call writer.SetInputData(grid)
To save screenshot, you can use vtkPNGWriter on the output of your vtkWindowToImageFilter,
as describe in this example