[vtkusers] vtk 4.2 - vtkPolyData - InsertNextLinkedCell problem

[Christoph Heindl]

Hi,

I'm recently working on an algorithm which requires me to insert new 
cells into the mesh. As I'm in need of topological queries, i have 
called BuildLinks() before the algorithm starts.
whenever i insert a new cell (VTK_TRIANGLE) by using 
vtkPolyData::InsertNextLinkedCell(VTK_TRIANGLE, 3, pts), i get the cell 
id of the inserted cell. But it seems that vtkPolyData does not update 
cell structures internally. In other words: Calling vtkPolyData::GetCell 
with the returned cell id and looping through the contained point ids 
does not yell the same point ids which were used when inserting the cell.
After endless hours of messing around with vtkPolyData i found that calling
vtkPolyData::InsertNextLinkedCell(VTK_TRIANGLE, 3, pts)
vtkPolyData::InsertNextLinkedCell(VTK_TRIANGLE, 3, pts)
(twice) does the job (although more cells are inserted as necessary, but
at least i can access the correct cell with the returned cell id).
Is there any known bug with this method or is it my fault?


thx in advance,
christoph