[vtkusers] vtkpython convert vtkMultiBlockDataSet to vtkDataSet

[Tim Kostka]

I’ve just started using vtkpython and have a hopefully basic question.



The output from vtkExodusIIReader is a vtkMultiBlockDataSet.

The input to vtkSurfaceFilter requires a vtkDataSet.



How do I get these two to talk to one another?  My file only has a single
block.



Thanks,

Tim





-- error --

vtkStreamingDemandDrivenPipeline (0x17dee0c0): Input for connection
index 0 on input port index 0 for algorithm
vtkDataSetSurfaceFilter(0x17ded900) is of type vtkMultiBlockDataSet,
but a vtkDataSet is required.

-- error --





-- code --

import vtk



# load the geometry

wedge = vtk.vtkExodusIIReader()

wedge.SetFileName('mesh_wedge_only.g')



# extract a single block ???

block = vtk.vtkExtractBlock()

block.SetInputConnection(0, wedge.GetOutputPort())

block.AddIndex(0)



# extract the surface of the block

surface = vtk.vtkDataSetSurfaceFilter()

surface.SetInputConnection(0, block.GetOutputPort())



# break into triangles

triangles = vtk.vtkDataSetTriangleFilter()

triangles.SetInputConnection(0, surface.GetOutputPort())



# write to STL file

output = vtk.vtkSTLWriter()

output.SetFileTypeToBinary()

output.SetFileName('mesh_surface_clipped.stl')

output.SetInputConnection(0, triangles.GetOutputPort())

output.Update()

-- code --
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