[vtkusers] image masking pb

[David Gobbi]

Hi Dean,

The vtkImplicitSelectionLoop works good for this, but it there isn't
any filter to convert a vtkPolyData into a SelectionLoop, you have to
do it by hand.

Once you have a vtkImplicitSelectionLoop, you can convert it into a
"stencil" with the vtkImplicitFunctionToImageStencil filter.  A "stencil"
is essentially a masked region that has been compressed into run-lengths,
a few of the image filters take a stencil as an additional input.

There is also a vtkPolyDataToImageStencil filter, but it is meant for
closed polyhedral surfaces, not for closed 2D polygons.

 - David


On Mon, 15 Dec 2003 dean.inglis at camris.ca wrote:

> Can someone suggest a pipeline to
> mask out a region enclosed by a
> closed polyline (a vtkPolyData consisting
> of points and line segments)?  The polyline
> may or may not be convex.
>
> Dean
>
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