[vtkusers] a bug in vtkFollower

[David Gobbi]

Hi Matjaz,

I was the one who 'fixed' vtkFollower for parallel projections.
I'll take a look into it.

 - David

--
  David Gobbi, MSc                    dgobbi at irus.rri.on.ca
  Advanced Imaging Research Group
  Robarts Research Institute, University of Western Ontario

On Wed, 6 Jun 2001, Matjaz Subelj wrote:

>
> I believe there is a bug in vtkFollower since the 1.33 revision (6
> months ago).
> Someone reported it before but it didn't get fixed (it's a trivial one
> though).
> >From the changelog (diff to previous 1.32):
>
> "ENH: now vtkFollower exhibits special behavior for ParallelProjection
>      (i.e. follows VPN instead of actor -> camera vec if
> ParallelProjection)"
>
> This is okay if it would be true. It follows DOP instead. Since DOP =
> -VPN
> the actor gets mirrored (Direction Of Projection vs. View Plane Normal).
> You can see this effect if you enable parallel projection in
> textOrigin.tcl
> example in graphics directory.
>
> Matjaz