[vtkusers] Filter a structured points-space through a 3d-polydata shape

[Bill Lorensen]

The input point scalars should be passed through. Can you provide a
short example that illustrates the problem?

Bill

2010/5/21 Álvaro González Lorente <sapito_verbenero at hotmail.com>:
> Hello,
>
> Thanks all for your help. It appears that vtkSelectEnclosedPoints has turned
> out to be the best amongst all choices you have told me. However, a problem
> has arised: if the initial values of the points in the Structured Points
> space were from 37.0 to 70.0, the ones that have fallen within the polydata
> 3d shape are now  0.00392157. Any idea why this is happening? I would like
> to keep the original values of those points.
>
>
>> Date: Thu, 20 May 2010 11:05:01 -0400
>> Subject: Re: [vtkusers] Filter a structured points-space through a
>> 3d-polydata shape
>> From: bill.lorensen at gmail.com
>> To: karthik.krishnan at kitware.com
>> CC: sapito_verbenero at hotmail.com; vtkusers at vtk.org
>>
>> Here is an example that uses SelectEnclosedPoints:
>> http://www.vtk.org/Wiki/VTK/Examples/PolyData/PointInsideObject
>>
>>
>> 2010/5/20 Karthik Krishnan <karthik.krishnan at kitware.com>:
>> > 2010/5/20 Álvaro González Lorente <sapito_verbenero at hotmail.com>
>> >>
>> >> Hello,
>> >>
>> >> I have a big structured points space, but not all of its points are of
>> >> my
>> >> interest, only the ones that are within the shape of a polydata
>> >> structure
>> >> (or an unstructured grid too). I wonder if any of you knows if there is
>> >> any
>> >> easy way to filter some particular points which are inside this
>> >> polydata
>> >> contour.
>> >>
>> >
>> > What kind of shape ?
>> >
>> > If you have a surface, a closed manifold surface, (only 2D cells), you
>> > can
>> > use vtkSelectEnclosedPoints. It will shoot rays and do intersection
>> > tests to
>> > mark the points inside.
>> >
>> > If you have a generic UGrid, you can either extract the boundary faces,
>> > ensure a closed topology and do the above.
>> >
>> > If you have a volume mesh, for instance tetrahedra, you can use the
>> > FindCell
>> > API on each tet to do the inside tests...
>> >
>> >
>> > --
>> > karthik
>> >
>> >
>> >
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