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

[Alex Malyushytskyy]

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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>>> >
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>>> >
>>> >
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>>> >
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>>
>>
>> --
>> Unpaid intern in BillsBasement at noware dot com
>>
>
>
>
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