[vtkusers] How to convert the vtkPolyData to vtkImageData

[David Doria]

On Sun, Aug 22, 2010 at 1:46 AM, XuXing <cool2201 at sina.com> wrote:

> Hi all
>
> I want to convert the vtkPolyData to vtkImageData, I have used the
> vtkPolydataToImageStencil to do the job, but it didn’t work, maybe there is
> some error in my code
>
> My purpose is to draw a line on the top of an image, so I used
> vtkImageBlend and vtkImageCanvasSource2D to finish it. Any advice will be
> appreciated, thanks.
>
>
>
>
>
> XuXing
>
>
>
I don't understand what converting a polydata to an imagedata has to do with
drawing on an image? If you want to do that, you'll have to snap the points
to a grid first:

http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/QuantizePolyDataPoints

You can draw on an image like this:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Widgets/ImageTracerWidget
<http://www.vtk.org/Wiki/VTK/Examples/Cxx/Widgets/ImageTracerWidget>(ignore
the picture of sphere - I'll update it later today)

Good luck,

David
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