[vtkusers] Polydata get point coordinates

[Eric E. Monson]

Hey Sara,

The method David advised may be the most direct for you, but I just wanted to point out that polyData->GetPoints() should return a vtkPoints object, not just point IDs. You should be able to use one of the GetPoint() variations of vtkPoints to get the coordinates from that, too.

http://www.vtk.org/doc/nightly/html/classvtkPoints.html

-Eric

------------------------------------------------------
Eric E Monson
Duke Visualization Technology Group


On Oct 15, 2010, at 2:26 PM, David Doria wrote:

> On Fri, Oct 15, 2010 at 2:13 PM, Sara Rolfe <smrolfe at u.washington.edu> wrote:
>> Hello,
>> I'm trying to get the 3D coordinates of polydata points.  I have been
>> used polyData->GetPoints();, which returns the point ID, but not the
>> location.  How can I access this information?
>> Thanks,
>> Sara
> 
> This should do the trick:
> 
> for(vtkIdType i = 0; i < polydata->GetNumberOfPoints(); i++)
>  {
>  double p[3];
>  polydata->GetPoint(i, p);
>  std::cout << "Point " << i << " : " << p[0] << " " << p[1] << " " <<
> p[2] << std::endl;
>  }
> 
> David
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