[vtkusers] Blended image display

[Matthieu Ferrant]

In 3D, everything is fine with a pipeline like the one you propose.

However, in 2D, using a similar pipeline, you have to either use a
vtkPolyDataMapper2D for the planeSource, but then the vtkActor2D and the
vtkImageActor don't take textures, or the vtkImageMapper which 
apparently doesn't allow you to display more than one image (as I
mentioned in the previous e-mail), unless you first blend them into a
single one with vtkImageBlend. One of the issues with vtkImageBlend is
that I couldn't blend a gray-scale image with a color one.

any suggestions ?

matt

David Gobbi wrote:
> 
> Using vtkTexture, vtkPlaneSource, vtkTextureMapToPlane, vtkDataSetMapper &
> vtkActor inside a vtkRenderer will allow interactive blending by changing
> the actor opacities.  This will probably also work with vtkImageActor, which
> would be a lot easier.
> 
>  - David
> 
> On Thu, 21 Jun 2001, Matthieu Ferrant wrote:
> 
> > Hi,
> >
> > I would like to know if it is possible to blend and visualize two images
> > within a single vtkImager. I have tried to create two 2D actors for both
> > images, setting their respective opacities to 0.5, but I can only see
> > the last image I add to the vtkImager. I also tried playing with
> > SetDisplayLocationToBackground but that wouldn't change anything. I did
> > experiment with the vtkImageBlend filter, but I'd like something more
> > interactive (i.e. be able to slide from one image to another with
> > varying opacity).
> >
> > What would be the best way to do this ?
> >
> > thanks,
> >
> > matt
> >
> >
> > --
> > M.Ferrant, Ph.D.
> > UCL/TELE Room A-157 Place du Levant, 2 B-1348LLN - Belgium
> > Tel. +32-10-478073 Fax. : +32-10-472089
> > http://www.tele.ucl.ac.be/MEMBERS/Ferrant_Matthieu_e.html
> >
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-- 
M.Ferrant, Ph.D.
UCL/TELE Room A-157 Place du Levant, 2 B-1348LLN - Belgium
Tel. +32-10-478073 Fax. : +32-10-472089
http://www.tele.ucl.ac.be/MEMBERS/Ferrant_Matthieu_e.html