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

[Roman Grothausmann]

Bill Lorensen wrote:
> Here is an example that uses SelectEnclosedPoints:
> http://www.vtk.org/Wiki/VTK/Examples/PolyData/PointInsideObject

You should be careful though with SelectEnclosedPoints. We have 
encountered strange/incorrect results (see my post to the list 
"Incorrect result of SelectEnclosedPoints?").

> 
> 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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-- 
Roman Grothausmann

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