[vtkusers] Save reflection result as STL file

[guo7212]

Thanks, I have tried it, but it doesn't work. The errors are
/vtkCompositeDataPipeline (000002087F79B090): Input for connection index 0
on input port index 0 for algorithm vtkSTLWriter(00000208201A81A0) is of
type vtkUnstructuredGrid, but a vtkPolyData is required./Is something wrong? 



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