[vtkusers] Data conversion and vtkXMLPPolyDataWriter - vtkXMLPPolyDataReader

[Daniele Bianchini]

Hello, 

 

I have to convert very large data to one of VTK file formats (15 - 20
million points). Source data are in ASCII file format.

 

 

I tried to use VTP file format but the software crashes because VTK classes
allocate so many memory.

For each point in source file I add:

*	a point in a vtkPoints class using InsertNextPoint function.
*	a cell with only one point in a vtkCellArray using InsertNextCell
function.
*	an RGB value in a vtkUnsignedCharArray class using InsertNextTuple3
function.
*	an Intensity value in a vtkFloatArray class using InsertNextTuple1
function.

 

 

So I want to write my data in some different VTP files and merging them
using a PVTP file.

I tried to save the PVTP as:

 

vtkXMLPPolyDataWriter* pXMLPPolyDataWriter = vtkXMLPPolyDataWriter::New();

            pXMLPPolyDataWriter->SetFileName(pvtpFilePath);

            pXMLPPolyDataWriter->SetInput(pPolyData);

            pXMLPPolyDataWriter->SetNumberOfPieces(nFiles);

            pXMLPPolyDataWriter->SetDataModeToBinary();

            pXMLPPolyDataWriter->Write();

            pXMLPPolyDataWriter->Delete();

 

where pPolyData is a very small vtkPolyData used only to save the PVTP.

Then I saved the VTP files with the correct names, but when I reopen the
PVTP file with ParaView I see that the first part (first VTP file) is
correct but the others not.

 

Can someone help me?

 

Daniele.

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