[vtkusers] Mouse interaction with vtkActor2D and Renderer/RenderWindow

[David Gobbi]

One minor caveat is that most OpenGL implementations only support
textures up to 2048x2048.  Other than that, texture-based image
viewing works very well and we've used it a lot.  If you use the
vtkImageActor it should be very straightforward to implement:
just pass the image through vtkImageMapToColors, then pass into
vtkImageActor.  You can add vtkImageReslice before vtkImageMapToColors
to get oblique slices.

 - David

On Tue, 26 Jun 2001, Charl P. Botha wrote:

> On Tue, Jun 26, 2001 at 11:31:35AM -0400, TJ Wilkinson wrote:
> > please let me know, for I'd be happy to hear it.  But what I know now is
> > that interaction works fine for a vtkActor in a vtkRenderer, but there is
> > no interaction for a vtkActor2D in a vtkRenderer when I switch them in the
>
> Whoops, I misunderstood your question.  In general, you're responsible for
> implementing this bite AFAIK, the configuration you're describing doesn't
> support as much out of the box manipulation as with normal vtkActors.
>
> One possible solution for doing what you want to do is to use a vtkActor
> with a plane source and a texture (which is your image).  Set up an
> orthogonal projection matrix with view direction normal to your plane.  If
> you disable any camera rotation, you have a texturing-based image viewer
> which means that if you have any texturing hardware, zooming (with
> interpolation) and moving will be hardware assisted.