[vtk-developers] Re: [vtkusers] Useless triangulation in unstructured grid rendering

[John Biddiscombe]

John
> As you mentioned, vtkMergeFilter or vtkMergeDataObjectFilter >
> vtkAssignAttribute already allow you to separate the geometry and
> attribute data. So, is it worth the additional complexity and effort of
> adding a new information key for this purpose?
The trouble is that these filters must be instantiated by the user - and 
the user needs to "know" in advance that the pipeline has geometry 
unchanging. Adding an information key would allow filters which can take 
advantage of it to bypass needless geometry recalculations 
(clip/cut/surface extraction/normal generation/many more etc) 
automatically without the user necessarily knowing that the geometry is 
fixed. Only the object generating the data need do anything.

It's a possibility I'd like to consider.

JB

-- 
John Biddiscombe,                            email:biddisco @ cscs.ch
http://www.cscs.ch/about/BJohn.php
CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82