[vtk-developers] question about vtkPolyDataMapper- relating coordinates to vtkPolyData coordinates

[David Gobbi]

Hi Michel,

To show cracks in a model, a good method is to set the backface
property to a bright, uniform color:

actor->GetBackfaceProperty()->SetAmbient(1.0);
actor->GetBackfaceProperty()->SetColor(1.0, 1.0, 1.0);

By setting the ambient coefficent to 1.0, you illuminate the inside
surface without any need for a light source.

The answer to your original question is actor->GetMatrix().

  David


On Wed, Nov 10, 2010 at 1:42 PM, Michel Audette
<michel.audette at kitware.com> wrote:
> Dear VTK developers,
>
> I'd like to ask you about vtkPolyDataMapper and vtkPolyData coordinates. I'd
> like to place a light source inside a brain model, to show with the light
> that there is a slit there along one of the sulci. I have a precise position
> in mind, in the vtkPolyData model, but I don't know how to relate that to
> mapped coordinates of the rendered model.
>
> Is it possible to get these latter coordinates through a suitable
> transformation of the vtkPolyData coordinates?
>
> Thanks for your kind support.
>
> Best wishes,
>
> Michel
>
>
> --
> Michel Audette, Ph.D.
> R & D Engineer,
> Kitware Inc.,
> Chapel Hill, N.C.
>
>
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