[vtkusers] how to write an unstructured grid into a stl file

Reza Faieghi mfaieghi at westerneng.ca
Sun Nov 13 12:03:32 EST 2016

Hi Utkarsh,

Thanks for the reply. I use the following code just like yours but I get
some errors that dsf is a pointer to an incomplete class type:

1 vtkSmartPointer<vtkUnstructuredGrid> ug =
2 vtkSmartPointer<vtkDataSetSurfaceFilter> dsf =
3 dsf->SetInputData(ug);
4 dsf->Update();
5 vtkSmartPointer<vtkTriangleFilter> triangleFilterx
= vtkSmartPointer<vtkTriangleFilter>::New();
6 triangleFilterx->SetInputConnection(dsf);
7 triangleFilterx->Update();
8 vtkSmartPointer<vtkSTLWriter> stlWriter =
9 std::string name = "file.stl";
10 stlWriter->SetFileName(file.c_str());
11 stlWriter->SetInputConnection(triangleFilterx->GetOutputPort());
12 stlWriter->Write();

At line 3, I am getting these errors:

        use of undefined type 'vtkDataSetSurfaceFilter'
        'SetInputData' : is not a member of
        'Update' : is not a member of

I think the way that I am using vtkDataSetSurfaceFilter is not correct. How
can I use it in a proper way?


On Sun, Nov 13, 2016 at 10:55 AM, Utkarsh Ayachit <
utkarsh.ayachit at kitware.com> wrote:

> vtkDataSetSurfaceFilter is indeed the way to go. You should be able to set
> an unstructrued grid as input. Not sure why it didn't work for you? Doesn't
> the following code work:
> vtkUnstructuredGrid* ug = ...
> vtkDataSetSurfaceFilter* dsf = ...
> dsf->SetInputDataObject(ug);
> Utkarsh
> On Sun, Nov 13, 2016 at 5:20 AM, Reza Faieghi <mfaieghi at westerneng.ca>
> wrote:
>> Hello,
>> I am wondering is there a way to write an unstructured grid into
>> an STL file?
>> I am not sure if this is correct but I realized that for writing
>> into an STL file, I have to create a triangle filter from my geometry. And,
>> to create the triangle filter, I need to extract surface of my unstructured
>> grid. I tried to use vtkDataSetSurfaceFilter for this purpose, but I was
>> not able to set an input to an instance of this class from a
>> vtkUnstructuredGrid.
>> I am not sure if my approach is correct. I would be really grateful if
>> you have any idea how to solve this.
>> Many Thanks,
>> Reza
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PhD Candidate,
Spencer Engineering Building Room 37
University of Western Ontario
London, ON, Canada, N6A 5B9
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