[vtkusers] vtkDecimate / vtk5.0

[mike jackson]

The reason that I and others may prefer the original vtkDecimate
algorithms is that they Produce "better" meshes for our uses. In my
case "better" means that I am able to better control the aspect ratio
of the produced triangles as eventually our model is going to be fed
into an FEA/FEM application. These applications typically do not like
high aspect ratio triangles. We found that for our application the
vtkDecimate produced "Better" meshes. vtkDecimatePro tended to produce
"inferior" results are did the other "decimation" algorithms.

"better" and "inferior" are my opinions of the results. Other users
may reverse these and find that one of the other Decimation algorithms
work "better" for them. These opinions are not meant to start a flame
war or anything else.

Mike Jackson


On Jan 2, 2006, at 2:56 PM, David Cole wrote:

In VTK 5.0, there are at least three classes related specifically to
decimation... :
http://www.vtk.org/doc/nightly/html/classvtkDecimatePro.html
http://www.vtk.org/doc/nightly/html/classvtkGreedyTerrainDecimation.html
http://www.vtk.org/doc/nightly/html/classvtkQuadricDecimation.html

My guess is that one of these is considered to have superceded
vtkDecimate and so vtkDecimate was dropped...

(I found these by searching for "decimat" on the main class list page
at http://www.vtk.org/doc/nightly/html/annotated.html)

HTH,
David


Corrie Allen wrote:

Hi Mike,
Can you tell me what it takes to update vtkDecimate from 4.4 so it 
will work in 5.0?  I'm new to VTK and don't want to bugger up 
something else.  Thanks.
corrie
On Dec 26, 2005, at 9:42 AM, Mike Jackson wrote:



On Dec 26, 2005, at 11:11 AM, Corrie Allen, Ph.D. wrote:

 I just loaded vtk 5.0 and can no longer find vtkDecimate.  A note  on
the list a few months ago asked about it's fate without any  apparent
answer.  Is vtkDecimate still available?  Thanks.
Corrie
_______________________________________________



Corrie,
 It got moved out of the "patented" folder into somewhere else but  I
could never find it. I ended up getting the source from the 4.4 
distribution and updating it to work with the 5.x distribution. I 
think the patents ran out on it so it can be used freely now  although
I would double check with Kitware on that.


Mike Jackson
imikejackson <at> gmail <dot> com




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