[vtkusers] Re: GenericDataSetTessellator question

[Soeren Gebbert]

Dear François,
thanks a lot for the fast answer, i have changed the return value to 4 
and now the tessellation looks much better.
But the face-centerpoint is still at the wrong position (moved to a 
corner). But i think i know now
where i have to search.

Thanks and best regards
soeren

François Bertel wrote:

> Hi Soeren,
>
> I suspect that this problem comes from the implementation of:
>
> int vtkBridgeCell::GetNumberOfBoundaries(int dim)
>
> For dim=0, the number of boundaries is NOT the number of points but 
> the number of "corner" points, for a quad it is always 4, whatever is 
> the number of points. The current implementation just returns the 
> actual number of points for a linear cell, but for a none linear cell 
> it returns the number of points minus the number of edges, which is 
> right for the VTK quadratic cells (because there is one extra point 
> per edge), BUT which is wrong in your case. So you should add your 
> case here by returning 4 in the quad case and see what happens.
>
> Regards.
>