I wrote: 

> Sent: 08 November 2007 08:16
> To: 'FlightGear developers discussions'
> Subject: Re: [Flightgear-devel] view handling news
> 
> 
> Melchior wrote
> 
> 
> > Sent: 07 November 2007 23:14
> > To: flightgear-devel@lists.sourceforge.net
> > Subject: [Flightgear-devel] view handling news
> > 
> > 
> > Since David complained about the damping mechanism in
> > viewer.cxx, I wanted to check whether the same feature could 
> > also be done in Nasal. (Damping is at the moment only used in 
> > the "Chase View". It's just lowpass filters on the 
> > heading/pitch/roll angles, which make the viewer follow the 
> > aircraft with a slight delay.)
> > 
> > I had to fix a jitter problem in the main loop, and there's 
> one more 
> > to fix for replay (already done on my HD), but most of the work is 
> > done. There's now a manager in $FG_ROOT/Nasal/view.nas 
> where one can 
> > register Nasal view handlers. This is by default only done for the 
> > Fly-By-View.
> > 
> > Here are two more examples. Each of them is an XML file with
> > some settings and embedded Nasal code, and implements a new 
> > "view". You can try them out at once:
> > 
> >   $ fgfs --aircraft=j3cub ~/chase-view-II.xml ~/model-view.xml
> > 
> > Use full paths for the files. (~ expands to a full path :-)
> > 
> > chase-view-II.xml is a proof of concept. It's a slightly
> >     extended chase view, where also latitude/longitude/altitude
> >     are lowpass filtered. This is nice to see how far an aircraft
> >     drops in a barrel roll. Might also be nice for movies.
> > 
> > model-view.xml allows to cycle through all carriers, tankers,
> >     aircraft, multiplayer (untested) with the q/Q keys.
> > 
> 
> The jitter in plib has pretty well been fixed here by these 
> modifications. There remains some low frequency and 
> relatively long pauses around KSFO and other texture/model 
> rich environments. The sound bug has been fixed. 
> 
> The model-view with multiplayer has been tested here and 
> works very well. This facility is a very nice add-on to FG. 
> Pity it wasn't available for the FSWeekend event in Lelystad, 
> because it is particularly applicable to this kind of event.
> 

P.S.

We get views like this:

ftp://abbeytheatre2.org.uk/fgfs/Screen-shots/Model-viewer.jpg

V.


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