[vtkusers] how to draw overlays on a image

[Alexis H. Rivera-Rios]

I actually have the same problem.  So far this is what
I did, although I don't think it is the solution. 
You'll need the latest version of VTK (nighltly
version)

create a vtkRectangularButton
assing your image as a texture of the button
(no need for transaparency)

Create a rectangle using vtkCell and vtkPoints
Draw the rectangles in front of the image

So if the button is at 0,0,0, the rectangle will be at
0,0,0.1

My problem right now if figuring out a way to compute
the coordinates of the rectangle in terms of the
texture image coordinates.

Hope this helps.  And if you find a better way, please
let me know.

Alexis

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