[vtkusers] Display 'Transparent' Map

[Janny Dong]

Hello, Jonathan and Dominik

Thanks for your suggestions. I have been looking at vtkImageThreshold and
vtkImageMaster, but I am not sure how to use them. I couldn't find a similar
example of what I am doing. Let's say, I already have a map to be overlaid
over my image. What I want to do is mask the ocean part as blue, for
example, and set the land part (in white) as transparent. How can I set one
color transparent? The map can be bmp, png, jpg...

Dominik, I've tried the actor transparency and it worked. I also want one
color to be totally transparent and others not.

Hope you can see my message...

Thanks again.

Janny
On 8/16/07, Dominik Szczerba <domi at vision.ee.ethz.ch> wrote:
>
> ... and/or actor transparency.
> - Dominik
>
> jonathan grimm wrote:
> > You could try vtkImageThreshhold and vtkImageMask or vtkImageMathematics
> to
> > combine the images in advance.
> > For rendering, simple is vtkImageActor.
> >
> > On 8/15/07, Janny Dong <janny.dong at gmail.com> wrote:
> >> Hello, vtkusers
> >>
> >> I made a movie with VTK to visualize the temperature changes, as shown
> in
> >> the attached screen shot (map.jpg). The red dots are locations of
> >> measurements. What I want to do is display a geographic map ( e.g. US
> map)
> >> over this color map showing the state boundaries. The US map is kind of
> >> 'floating' above my temperature map, masking the ocean part but not the
> >> color changes (as in usmap.jpg).
> >>
> >> Could someone shed some lights on which VTK class to use? I was looking
> at
> >> vtkTexture but I don't think it is the right one.
> >>
> >> Thanks!
> >> Janny
> >>
> >> _______________________________________________
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> >>
> >>
> >
> >
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
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> --
> Dominik Szczerba, Ph.D.
> Computer Vision Lab CH-8092 Zurich
> http://www.vision.ee.ethz.ch/~domi
>
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