[vtkusers] modification to vtkDelaunay2D for topographical models?

[Jean-Dominique Barnichon]

John,

I've already started the second solution.
However, it is a more tricky than simply removing such triangles (which
makes holes in the mesh!). Actually before removing them, I must try to
rearrange them with other existing triangles to avoid removing inner
triangles (which at the moment I still have some problems with). But for
triangles that belong to the boundary, this removal is straightforward, I
agree.
By the way, don't you think such filter would be of any interest for the vtk
community?

Jean-Do


-----Message d'origine-----
De : John Biddiscombe [mailto:john.biddiscombe at mirada-solutions.com]
Envoyé : lundi 28 juillet 2003 17:01
À : Jean-Dominique Barnichon; vtkusers
Objet : RE: [vtkusers] modification to vtkDelaunay2D for topographical
models?


Jean-Do

> The solution could be either :
> - to modify vtkDelaunay2D filter such that this type of
> triangle (3 pts
> belonging to the same constrained line) does not exist,

Too much work and would result in nasty reworking of delaunay.

> - or to create a filter that would take as input the
> vtkDelaunay2D output
> and the input lines, and that would modify the mesh such that
> this type of
> triangles would be removed or redistributed.

yes. Easy solution. just loop over the (delaunay) triangles and then get the
cells (of the constrained lines) used by the points and check they are not
all the same. reject those you don't like.

JB

RPD : A drag drop front end for vtk
www.skippingmouse.co.uk