[vtkusers] how to implement selection of cells along a line (like autocad's fence)

[Bill Lorensen]

Also, OBBTree, contrary to my initial comments,  seems to work.
See:
http://itk.org/Wiki/VTK/Examples/Cxx/DataStructures/OBBTreeExtractCells

Bill


On Sun, Apr 7, 2013 at 12:56 PM, Bill Lorensen <bill.lorensen at gmail.com>wrote:

> This example:
>
> http://itk.org/Wiki/VTK/Examples/Cxx/DataStructures/ModifiedBSPTreeExtractCells
>
> illustrates how to extract cells intersected by a line.
>
>
>
> On Fri, Apr 5, 2013 at 6:00 PM, Alex Malyushytskyy <alexmalvtk at gmail.com>wrote:
>
>> Have you tried vtkModifiedBSPTree? It has IntersectWithLine version which
>> returns multiple cells.
>>  virtual int<http://www.vtk.org/doc/nightly/html/vtkVectorOperators_8h.html#a61569f2965b7a369eb10b6d75d410d11>vtkModifiedBSPTree::IntersectWithLine
>> ( const double<http://www.vtk.org/doc/nightly/html/vtkVectorOperators_8h.html#a45c855d65dd0e2b57b08024500ff9159>
>>   *p1*[3],
>>
>> const double<http://www.vtk.org/doc/nightly/html/vtkVectorOperators_8h.html#a45c855d65dd0e2b57b08024500ff9159>
>>   *p2*[3],
>>
>> const double<http://www.vtk.org/doc/nightly/html/vtkVectorOperators_8h.html#a45c855d65dd0e2b57b08024500ff9159>
>>   *tol*,
>>
>> vtkPoints <http://www.vtk.org/doc/nightly/html/classvtkPoints.html> *  *
>> points*,
>>
>> vtkIdList <http://www.vtk.org/doc/nightly/html/classvtkIdList.html> *  *
>> cellIds*
>> )
>>
>> Alex
>>
>>
>> On Fri, Apr 5, 2013 at 2:12 PM, Bill Lorensen <bill.lorensen at gmail.com>wrote:
>>
>>> I'm sorry. I should have said I have low confidence that
>>> vtkOBBTree::IntersectWithLine will work. If it does not, it is a bug.
>>>
>>> Bill
>>>
>>>
>>> On Fri, Apr 5, 2013 at 4:39 PM, Bill Lorensen <bill.lorensen at gmail.com>wrote:
>>>
>>>> David,
>>>>
>>>> In theory the vtkOBBTree::IntersectWithLine should do the job, but
>>>> since that method has 0 test coverage and my preliminary testing indicates
>>>> it only returns the first intersection.
>>>>
>>>> More investigation is required.
>>>>
>>>> Bill
>>>>
>>>>
>>>>
>>>> On Fri, Apr 5, 2013 at 2:54 PM, David Gobbi <david.gobbi at gmail.com>wrote:
>>>>
>>>>> Hi Andreas,
>>>>>
>>>>> Look at vtkOBBTree.  It has a method called InstersectWithLine that
>>>>> can return the Ids of all of the cells that are intersected by a line.
>>>>>
>>>>>  - David
>>>>>
>>>>> On Fri, Apr 5, 2013 at 12:07 PM, Andreas Buykx <A.Buykx at tnodiana.com>
>>>>> wrote:
>>>>> > Hi all,
>>>>> >
>>>>> >
>>>>> >
>>>>> > I’m looking for a way to extract cells from an unstructured grid by a
>>>>> > polyline selection, similar to what vtkImplicitSelectionLoop does
>>>>> for a
>>>>> > closed polygon. Is this something that can be implemented
>>>>> efficiently with
>>>>> > algorithms from VTK or should I write a custom algorithm?
>>>>> >
>>>>> >
>>>>> >
>>>>> > Thanks,
>>>>> >
>>>>> > Andreas Buykx
>>>>> >
>>>>> > Senior Software Engineer
>>>>> >
>>>>> >
>>>>> >
>>>>> > TNO DIANA BV
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