[vtkusers] FindCell method of vtkCellLocator

[Alex Malyushytskyy]

It is not clear that attached picture corresponds to your claims.
There is no visible  relation between trianglePoint and
geometry->GetNumberOfPoints().
Also  for (vtkIdType ptId = 0; ptId < geometry->GetNumberOfPoints(); ++ptId)
loop does not make any sense cause nothing changes in the loop.

So I guess your trianglePoint is not what you think it is.
For example if this point is shared by 2 triangles you will have the same
effect.
Another possible problem might be absolute value 0.1 used.
For example your triangle may have size smaller than it, which will be a
source of such effect too.

Your example is not complete , you could create much better example
initializing all available variables so the behavior can be reproduced.

Alex



On Mon, Jul 8, 2013 at 3:44 PM, shinpei <noro_shinpei at web.de> wrote:

> Hi,
>
> I have two triangle cells in my vtkCellLocator and I create a little bb
> around a point of one triangle (see picture). Now I use FindCell(bb,
> idList)
> and I should get one id, but I get two. Is this a bug, or must I change
> something?
>
> <http://vtk.1045678.n5.nabble.com/file/n5721831/Unbenannt.png>
> - two trinagles (red)
> - bb (blue)
>
> My code:
>
>     for (vtkIdType ptId = 0; ptId < geometry->GetNumberOfPoints(); ++ptId)
>     {
>         bounds[0] = trianglePoint[0] - 0.01;
>         bounds[1] = trianglePoint[0] + 0.01;
>         bounds[2] = trianglePoint[1] - 0.01;
>         bounds[3] = trianglePoint[1] + 0.01;
>         bounds[4] = trianglePoint[2] - 0.01;
>         bounds[5] = trianglePoint[2] + 0.01;
>
>         cellLocator->FindCellsWithinBounds(bounds, foundCells);
>
>         int size = foundCells->GetNumberOfIds(); // is always two
>     }
>
>
> Thx
>
>
>
> --
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