[vtkusers] Manually constructing a vtkPolyData

[Dai Qiang]

Hi Randall,
 
This piece of code might be helpful.
 
  for(int i=0;i<count;i++)
{
   int a, b, c;
   importCellArray->InsertNextCell(3);
   importCellArray->InsertCellPoint(a);
   importCellArray->InsertCellPoint(b);
   importCellArray->InsertCellPoint(c);
}//Generate Triangle List
 
for(i=0;i<count;i++)
{
   float x,y,z;
   importPoints->InsertPoint(importPoints->GetNumberOfPoints(),x,y,z);
}//Generate Points

finalPoly->SetPoints(importPoints);
finalPoly->SetPolys(importCellArray);
 
Qiang

Randall Hand <randall.hand at gmail.com> 写道：
I have a code block similar to this:

    // First load the points
    vtkPoints *newPts = vtkPoints::New();
    newPts->Allocate(countVert);
    for(i=1; i<=countVert; i++) {
        newPts->InsertPoint(i-1, x, y, z);
    }

    // Now load up the connectivity
    vtkIdList *pts = vtkIdList::New();
    pts->Allocate(VTK_CELL_SIZE);
    vtkCellArray *newPolys = vtkCellArray::New();
    newPolys->Allocate(countPoly);

    for(i=1; i<=countPoly; i++) {
        pts->Reset();
        pts->InsertNextId(v1-1);
        pts->InsertNextId(v2-1);
        pts->InsertNextId(v3-1);
        newPolys->InsertNextCell(pts);
    }
    fclose(fptr);

    vtkPolyData *output = vtkPolyData::New();
    output->SetPoints(newPts);
    newPts->Delete();
    output->SetPolys(newPolys);
    newPolys->Delete();
    pts->Delete();

Now when I try to query the resulting vtkPolyData, I get segfaults in the ComputeBounds routines.  I tried connecting it to a vtkPLYWriter, and it saves a file to disk that crashes both 3DSMax & Paraview.  Any ideas what I'm missing here?

-- 
Randall Hand
http://www.yeraze.com _______________________________________________
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