[vtkusers] Help on selecting voxels inside a vtkImplicitFunction

[Robin Zhao]

Hi, David,

Thank you very much for your quick response.

I'm now studying vtkImageStencil which seems to be able to meet my
requirement.

Cheers,

Robin

On Sat, Sep 19, 2009 at 9:48 PM, David E DeMarle
<dave.demarle at kitware.com>wrote:

> In general the output of this type of operation has to be either
> vtkUnstructuredGrid or vtkPolyData because when you take an arbitrary subset
> out of a structured data set you loose the regularity.
>
> vtkExtractVOI pulls out aligned "slabs" out of structured datasets and
> because the slabs are aligned in ijk space it's output can stay structured.
>
> If you have to keep it structured your only option is to create an
> inside/outside data array. You can threshold on that later if you need to,
> but again that will produce an unstructured dataset. I think vtkProbeFilter
> and vtkSampleFunction both can be used to create the "insidedness" array.
> Others options likely exist too.
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-371-3971 x109
>
>
> On Sat, Sep 19, 2009 at 10:13 AM, Robin Zhao <zhaoyoubing at gmail.com>wrote:
>
>> Hi, Dear vtk guys,
>>
>> I met some difficulties on selecting voxels inside a user defined implicit
>> function.
>>
>> I have studied vtkExtractGeometry, but its output is unstructured grid.
>>
>> I also studied vtkSelection which seems not to support
>> vtkImplicitFunction.
>>
>> Are there any possible methods to do it in the framework of vtk,
>> or do I need to do it by myself.
>>
>> Cheers
>>
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-- 
Robin Youbing Zhao(趙友兵)
Phone: (+44) 75 0202 1598  (UK)
          (+86) 135 8571 8767 (中國)
Email : zhaoyoubing at gmail.com
MSN  : zhaoyoubing at hotmail.com
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