[vtkusers] Dilation of a vtkPolyData

[David.Pont at scionresearch.com]

David Doria <daviddoria at gmail.com> wrote on 26/04/2009 23:54:03:

> On Sun, Apr 26, 2009 at 6:16 AM, Maxime Taquet <hystomagna at gmail.com>
wrote:
> Dear all,
>
> I have a vtkPolyData object which represents the surface of a bone.
> I would like to enlarge this surface of 1mm in all directions. This
> can be seen as the new surface of a dilated version of the bone.
>
> Do you know any easy way to compute it?

Having just replied to another post where vtkImplicitModeller was
mentioned.... it might be worth a look for your problem,

  regards, Dave

>
> Best,
>
> Maxime
> _______________________________________________
>
> Maybe you could just scale the polydata using
> #include <vtkTransformPolyDataFilter.h>
>
> vtkSmartPointer<vtkTransformPolyDataFilter> TransFilter =
> vtkSmartPointer<vtkTransformPolyDataFilter>::New();
>     TransFilter->SetInput(YourPolydata);
>     TransFilter->SetTransform(ScaleTransform); //use vtkTransform
> (or maybe vtkLinearTransform)
>     TransFilter->Update();
>     vtkPolyData* ScaledPolydata = TransFilter->GetOutput();
>
>
> I think you'd have to center the data, scale it, and then move it
> back to the original location. You'd have to figure out what % to
> scale to achieve the 1mm goal.
>
> Dave_______________________________________________
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