[vtkusers] Question regarding vtkGeometryFilter

[kiatchaib]

Hi,

I’m very new to VTK and having problem using vtkGeometryFilter. I have a set
of unorganized point cloud that I want to generate surface mesh. I searched
in vtkusers forum and found this thread that resembles my situation.

http://www.vtk.org/pipermail/vtkusers/2008-October/097629.html

So, I wrote the code following the solution in the thread (first generate
tetrahedral mesh using vtkDelaunay3D and then use vtkGeometryFilter to
extract only the surface). 
My code:

vtkDelaunay3D* tetraMesh = vtkDelaunay3D::New();
vtkGeometryFilter* surfaceMesh = vtkGeometryFilter::New();
vtkPolyData* pcPolyData = vtkPolyData::New();
…
tetraMesh->SetInput(pcPolyData);// Find tetrahedral mesh 
tetraMesh->SetTolerance(0.001);
tetraMesh->Update();  
surfaceMesh->SetInput(tetraMesh->GetOutput());// Pass only surface mesh
surfaceMesh->Update();
…

But I got this error 'void vtkPolyDataAlgorithm::SetInput(vtkDataObject *)'
: cannot convert parameter 1 from 'vtkUnstructuredGrid *' to 'vtkDataObject
*'  when complied the code. If I understand correctly, ‘vtkGeometryFilter’
accepts 'vtkUnstructuredGrid'  and the output is ‘vtkPolyData’ type. Can
anyone give me an advice, what could be the cause of this error? I use VTK
5.4.0 and Microsoft Visual Studio .NET 2003. Thank you in advance for your
help. 

Kiatchai
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