[vtkusers] CellLocator, Octrees and Segfaults...

[Philipp Kemmeter]

Heya!

While trying to get my Polydata to and octree structure, I found
vtkCellLocator as a class, which should do so.

I've tried to use it and to iterate through those cubic cells which
are the nodes of an octree. But  without success.

Here is the code snip of my try:

  vtkSphereSource *sphere = vtkSphereSource::New();
    sphere->SetThetaResolution(8); sphere->SetPhiResolution(8);
    sphere->SetRadius(1.0);
    sphere->Update();

  vtkPolyDataMapper *sphereMapper = vtkPolyDataMapper::New();
    sphereMapper->SetInput(sphere->GetOutput());
  vtkActor *sphereActor = vtkActor::New();
    sphereActor->SetMapper(sphereMapper);

  // Build a locator
  vtkCellLocator *cellLocator = vtkCellLocator::New();
  cellLocator->SetDataSet(sphere->GetOutput());
  cellLocator->BuildLocator();



  int num = cellLocator->GetNumberOfBuckets();
  for (int i = 0; i < num; i++) {
  	std::cout << "Bucket " << i << ": ";
  	std::cout << cellLocator->GetCells(i)->GetNumberOfIds();
  }


The output is short: "Segmentation Error".

Why?

The expression of kill is cellLocator->GetCells(i)->GetNumberOfIds();

more precisely ->GetNumberOfIds();

It dies while accessing the cell got by GetCells(i).

So, do you have any suggestions? Or is my thinking simply wrong?

Thanks for you help,
 Phil

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