[vtkusers] Check if point is inside convex hull

[Dominik Szczerba]

Note that this may not be robust as the tets created by the 
vtkDelaunay3D may be flat.

David Doria wrote:
> On Wed, Nov 4, 2009 at 7:23 AM, Bryn Lloyd <blloyd at vision.ee.ethz.ch> wrote:
>> Your mesh is a vtkUnstructuredGrid, i.e. it is a vtkDataSet.
>>
>>
>> call the function:
>>
>> vtkDataSet::FindCell(double x[3], vtkCell *cell, vtkIdType cellId, double
>> tol2, int &subId, double pcoords[3], double *weights)
>>
>> or any other variant of this function.
>>
>>
>> It returns the cell Id or -1 if no cell was found to contain the point.
> 
> 
> Dirk,
> 
> Can you make a simple, self contained demo of this once you get it to
> work and add it to the wiki?
> 
> Thanks,
> 
> David
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