[vtkusers] Dilation of a vtkPolyData

[David Doria]

 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?
>
> 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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