[vtkusers] vtkGraph::AddVertex segfault

[Caleb Johnston]

The code is not that compilable without Qt, VTK, ITK, and Cmake installed.
It is publicly hosted at SourceForge:
http://sourceforge.net/projects/glassbrain/

And the stack trace shows the problem arrises from the AddVertex call.

On Thu, May 13, 2010 at 2:25 PM, David Doria
<daviddoria+vtk at gmail.com<daviddoria%2Bvtk at gmail.com>
> wrote:

> On Thu, May 13, 2010 at 2:16 PM, Caleb Johnston <cjj37 at cornell.edu> wrote:
> > I'm getting a segfault when calling vtkMutableUndirectedGraph::AddVertex.
> > However, it does not always occur at the same vertex. Sometimes it is
> after
> > the 2nd vertex. Sometimes it won't happen at all (though rarely). I'm
> only
> > adding about 120 vertices. And the program is not consuming large amounts
> of
> > data so I don't understand why this is happening. Also, this only happens
> in
> > Linux and Windows but not MacOS X. Below, I have included my algorithm
> for
> > adding vertices.
> > thanks,
> > Caleb
> > ...
> > int len = 0;
> > double X,Y,Z,Count;
> > for(i=0, j=0; j<numberOfLabels; i+=3, j++){
> >    X = (double)coords[i];
> >    Y = (double)coords[i+1];
> >    Z = (double)coords[i+2];
> >    Count = (double)centroids[j];
> >    if(Count>0.0){
> >       X = X / Count;
> >       Y = Y / Count;
> >       Z = Z / Count;
> >       len++;
> >       graph->AddVertex();  // crashes here.
> >       graph->Update();
> >       points->InsertNextPoint(X, Y, Z);
> >    }
> > }
> > ...
>
> I've used this in Linux plenty of times with no problems. If you post
> some compilable code I can see if it works on my machine. My initial
> bet is that something is going wrong around there, like accessing out
> of bounds elements in coords or centroids.
>
> Thanks,
>
> David
>
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