vtkRenderLargeImage and ParallelProjection now working ?

[David Gobbi]

Hi Markus,

It looks like vtkRenderLargeImage is only designed to work with
perspective.  It would be easy to fix, though, by adding the
following line to vtkRenderLargeImage.cxx just under the
cam->SetViewAngle() line:

cam->SetParallelScale(this->GetParallelScale/this->Magnification)

This will also require the new vtkCamera.cxx, quite coincidentally.

 - David

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

On Tue, 25 Apr 2000, Markus Heller wrote:

> Hi,
> 
> I posted this some time ago without getting an answer,
> so here I go again:
> 
> I'd like to use vtkRenderLargeImage in combination
> with a parallel projection. Although things work out
> with a perspective projection, the method does not
> seem to work with a parallel projection.
> 
> Adding the following lines of code to e.g. "bottle.tcl"
> illustrates what happens: instead of magnifying the
> picture by a factor of 5, 5x5=25 views of the bottle
> are combined in one picture:
>  
> 
> set cam1 [ren1 GetActiveCamera]
> $cam1 Zoom 0.9
> $cam1 Elevation 0
> $cam1 Azimuth 90
> $cam1 Roll 90   
> 
> # next line causes strange behav. of vtkRenderLargeImage
> $cam1 SetParallelProjection 1 
> 
> vtkRenderLargeImage rL
>  rL SetInput ren1
>  rL SetMagnification 5
>  
> vtkPNMWriter writer
>   writer SetFileName LargeBottle.ppm
>   writer SetInput [rL GetOutput]
>   writer Write
> 
> 
> 
> Maybe the latest changes in the vtkCamera code eliminated 
> the problem already - can somebody using the current nightly
> release comment on this ? I'm currently unable to compile
> a new release.
> 
> Markus
> 
> 
> -- 
> -------------------------------------------------------------------
> Markus Heller  				      mailto:heller at acm.org
> -------------------------------------------------------------------
> Currently staying at:
> Medizinische Fakultaet Charite, 
> Humboldt-Universitaet zu Berlin
> Forschungslabor der Unfall- und Wiederherstellungschirurgie
> Augustenburger Platz 1
> D-13353 Berlin
> Tel: +49 (0)30 450 59159  Fax: +49 (0)30 450 59969
> e-mail: heller at acm.org, markus.heller at charite.de
> http://www.charite.de/biomechanik
> 
> Otherwise:
> Universitaetsklinikum Ulm 
> Institut fuer Unfallchirurgische Forschung und Biomechanik
> Helmholtzstr. 14
> D-89081 Ulm
> http://lyra.medizin.uni-ulm.de/ufb.html/ufb-home-de.html
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