Hi Geoff,

> Well since I still get a black screen after iconizing,
> I dropped in some debug output in
> src/Viewer/CameraGroup.cxx, around line 220, code like -
> 
> static double last_w = -1.0;
> static double last_h = -1.0;
> void CameraInfo::resize(double w, double h)
> {
>     if ((last_w != w)&&(last_h != h)) {
>         printf("Resize from %f,%f to %f,%f\n",
>            last_w, last_h,
>            w, h );
>         last_w = w;
>         last_h = h;
>      }
>      if (w -- 1.0 && h == 1.0)
>         return;
>      etc
> and re-compiled. Just to see what value it was when
> I iconized...

and ?

[...]
> No more little squares in the corner, 

These are called 'rendering buffers' in the debug menu



[...}
> Still get the lime green haze at certain angles -
> http://geoffair.org/tmp/rembrandt-green3.png
> http://geoffair.org/tmp/rembrandt-green4.png

These are z-fighting between the geometry rendered in the geometry pass and the 
normal buffer incorrectly rendered a second time in the additional light pass. 
These artifacts on terrain are supposed to be past since commit 
http://gitorious.org/fg/simgear/commit/a634d7c3613170aa091bba6e651421e1c6213c90
There could be some remaining on models.

Regards,
-Fred

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