[vtkusers] vtkPointPicker -- Getting the tuple of a point that's not a vtk point

[Amy Squillacote]

Bill,

I really can't make that kind of a recommendation; if you built VTK 
yourself (in debug instead of release mode), try stepping through the 
code in a debugger to figure out where the incorrect values are coming 
from. As for telling you what method to try, it helps to have VTK source 
code and the doxygen-generated help pages (and to have been using VTK 
for about 8 years). :-)

- Amy

William E Lucarell wrote:
> Amy,
>
> Thanks! You must know your methods really well! I set the tolerance to 1.
> The errors are fewer, but I still get some fake nodes. Which tolerance value
> do you recommend to completely eliminate "fake nodes" and "fake scalar
> values" such as -4973.1830140 when my scalar range is 0-625?
>
> Thanks,
>
> Bill
>
> -----Original Message-----
> From: Amy Squillacote [mailto:ahs at cfdrc.com] 
> Sent: Wednesday, April 09, 2008 9:43 AM
> To: William E Lucarell
> Cc: 'VTK_question'
> Subject: Re: [vtkusers] vtkPointPicker -- Getting the tuple of a point
> that's not a vtk point
>
> Hi Bill,
>
> Have you tried setting the tolerance of the picker (using the 
> SetTolerance method in vtkPicker)? It's specified as a fraction of the 
> width of the render window.
>
> - Amy
>
> William E Lucarell wrote:
>   
>> -->
>>
>> I have a mesh with different scalar values. If I press P when I'm on a 
>> point, I will get the corresponding node number and scalar value. I 
>> turned pickable off on all actors but the contour actor so that there 
>> wouldn't be any erroneous nodes. However, oftentimes, if I press P 
>> when I'm in the middle of a cell but not on a point, a nonexistent 
>> node number and nonexistent scalar value will appear on my "query 
>> window". Is there a way to get the nearest point or get the value of 
>> the nearest contour line when picking?
>>
>> Thanks!
>>
>> */Bill Lucarell/*
>>
>> ------------------------------------------------------------------------
>>
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-- 
Amy Squillacote                    Phone: (256) 726-4839
Computer Scientist                 Fax: (256) 726-4806
CFD Research Corporation           Web: http://www.cfdrc.com
215 Wynn Drive, Suite 501
Huntsville, AL  35805