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.

Well done Melchior

Regards

Vivian


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