AW: [vtkusers] Getting Cutplanes more interactive?

[Jeff Lee]

Saeger, Marian wrote:

>Hi!
>
>I'm using VTK 4.2.3 - the one that shipped with the books.
>
>Would that include your optimizations?!? =|
>  
>
Sadly, it does not include the changes.  I made them just after the 
cut.  The changes I made are isolated to vtkCutter.cxx,h, so you could 
just grab them from cvs.  vtkCutter.cxx-v1.75 and vtkCutter.h-v1.60 
should get you the changes without having to upgrade to the dev 
version.  Of course, you could always just get either the bleeding-edge 
dev version, or the interim release 4.4.
-Jeff

>Greetings,
>
>Marian 
>
>
>
>-----Ursprüngliche Nachricht-----
>Von: Jeff Lee [mailto:jeff at cdnorthamerica.com] 
>Gesendet: Donnerstag, 6. Mai 2004 00:50
>An: Saeger, Marian
>Cc: vtkusers at vtk.org
>Betreff: Re: [vtkusers] Getting Cutplanes more interactive?
>
>Hi,
>Which version of vtk are you using?  I committed some optimizations for 
>unstructured datasets about 10 months ago...
>-Jeff
>
>Saeger, Marian wrote:
>
>  
>
>>Hi!
>>
>>I am visualizing an unstructured grid with 5 associated cell data arrays,
>>~2.000.000 scalar values each.
>>
>>I'm using vtkImplicitPlaneWidget in association with vtkCutter to let the
>>user navigate through the data. Unfortunately, the interactive response is
>>very bad on a 2.8GhZ CPU. Every time the cutplane needs to be updated,
>>    
>>
>there
>  
>
>>is a ~10s delay.
>>
>>I was wondering if this is a known performance issue related to
>>    
>>
>unstructured
>  
>
>>grids? I guess it takes some time to access the data and interpolate the
>>values - but are there any hints how to speed up that process? Especially
>>because I want to update the plane on every InteractionEvent, not only on
>>EndInteractionEvent.
>>
>>vtkPlaneWidget, in opposite to vtkImplicitPlaneWidget, has the opportunity
>>to specify grid resolution. To speed up things during interaction one could
>>reduce that resolution. I found no option for vtkImplicitPlane to do
>>    
>>
>similar
>  
>
>>things....=|
>>
>>Or may vtkCutter be the bottleneck? What would be more likely to eat up
>>calculation time - calculating the cutplane, or probing the cell data
>>arrays?!? =|
>>
>>Thanks in advance for any useful hints!
>>
>>Greetings,
>>
>>Marian
>>
>>
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>> 
>>
>>    
>>
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