Re: genapts

Dale E. Edmons wrote:

> Hi all,
>
> I finally had to rewind by CVS back to 10/10/2004 to get it working.  
> There were two main problems:   1) Helipads caused genapts to throw an 
> exception (easily fixed), and 2) the --chunk type options don't seem 
> to be written yet and genapts would try to process the whole world 
> (not good when debugging scenery scripts).  ;)
>
> Secondly, would it be feasible to change the way fgfs handles distant 
> tiles?  Throwing in fog so one just can't see in the distance isn't 
> very realistic (except in Los Angeles or on certain cloudy/foggy 
> days).  It would seem that if a second set of very low resolution 
> tiles were available fgfs could load low resolution tiles from the 
> maximum viewing distance to some inner viewing radius (say 60km) and 
> then unload the lores tile and switch in the high resolution tile.  
> The low resolution tiles would essentially just provide the skyline so 
> only terrain and maybe a few lights would be needed.  For those that 
> have slow video cards they could use just the low resolution tiles and 
> at least be able to try fgfs.  At any rate, with suitable logic, fgfs 
> could always use high res if low isn't available and use the fog model 
> currently being used.


The difficulty with multiple LOD for terrain tiles is matching up the 
edges so that no cracks show.  Cracks are much more visible and annoying 
than you might first suspect, and they aren't always trivial to hide.  
People have devised a number of different schemes to handle the edge 
matching, none of which are perfect.  It still might be worth pursing 
something, and if we did, I'd be in favor of putting skirts around all 
the tiles as an attempt to hide the cracks, then we'd have to live with 
the edges not matching up perfectly, but perhaps it wouldn't be so 
noticable.

Regards,

Curt.

-- 
Curtis Olson        http://www.flightgear.org/~curt
HumanFIRST Program  http://www.humanfirst.umn.edu/
FlightGear Project  http://www.flightgear.org
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