如何将网格转换为VTK格式? [英] How to convert a mesh to VTK format?

问题描述

我有自己格式的网格，我想将其导出到.vtk文件.我该怎么做?

I have a mesh in my own format and I want export it to a .vtk file. How do I do this?

原始网格的格式如下:(伪代码)

The original mesh is in the following format: (Pseudocode)

class Mesh {

   List<Float[3]> _coordinates

   List<int[4]> _tetra //(elements, Faces, etc.)

}

我希望这可以澄清我的问题.我只想用Paraview加载它，所以我不在乎它是否是结构化的，多边形的等等.

I hope this clarify my problem. I just want load it with Paraview so I don't care if it is structured, poly, etc.

推荐答案

您可以创建vtkUnstructuredGrid:

You may create a vtkUnstructuredGrid:

//vtkPolyData *data = vtkPolyData::New();
vtkUnstructuredGrid *mesh = vtkUnstructuredGrid::New();
vtkPoints *points = vtkPoints::New();
vtkCellArray *cells = vtkCellArray::New();

//vtkIdType pointIDs[4];

std::vector<point>::const_iterator iterator1 = fpoints.begin();

point aux;

if ( event_report != NULL ) { event_report->SetMaxTicks(fpoints.size() + fnodes.size()); }
points->SetNumberOfPoints(fpoints.size());
int pointId = 0;
for (;iterator1 != fpoints.end();iterator1++)
{
    aux = *iterator1;
    points->SetPoint(pointId, aux.coord);
    pointId++;
}

std::vector<node>::const_iterator iterator2 = fnodes.begin();

node aux1;

vtkSmartPointer<vtkIdTypeArray> idCells = 
  vtkSmartPointer<vtkIdTypeArray>::New();
idCells->SetNumberOfComponents(5);
idCells->SetNumberOfTuples(fnodes.size());

int cellIndex = 0;
for (;iterator2 != fnodes.end(); iterator2++)
{
    aux1 = *iterator2;
    vtkIdType * tuple = new vtkIdType[4];
    tuple[0] = 4;
    tuple[1] = aux1.indexs[0] - 1;
    tuple[2] = aux1.indexs[1] - 1;
    tuple[3] = aux1.indexs[2] - 1;
    tuple[4] = aux1.indexs[3] - 1;
    idCells->SetTupleValue(cellIndex, tuple);
    cellIndex++;
}
cells->SetCells(fnodes.size(), idCells);

mesh->SetPoints(points);
mesh->SetCells(VTK_TETRA, cells);

//vtkPolyDataWriter *writer = vtkPolyDataWriter::New();
vtkUnstructuredGridWriter *tetra_writer = vtkUnstructuredGridWriter::New();
tetra_writer->SetFileName( filename );

#if VTK_MAJOR_VERSION <= 5
    tetra_writer->SetInput(mesh);
#else
    tetra_writer->SetInputData(mesh);
#endif

tetra_writer->Write();
tetra_writer->Delete( );

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