[vtkusers] Window->Image coordinate conversions?

[David Doria]

On Fri, Oct 23, 2009 at 12:21 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
> After an InitTraveral, NextActor should return the first actor. At
> least that's what it did 10 years ago.
>
> Can you run in a debugger?


Of course the one thing I forgot to check for NULL was null...
RendererCollection is null, so calling InitTraversal on it is
obviously no good. Did I not cast the render window from caller
correctly? Why else would this collection be invalid?

Thanks,

David