Using textures rendered from the scenery also allows to create intermediate
steps at a higher resolution. Ultimately it should be possible to transition
between the scenery derived texture and the blue marble texture by generating
intermediate stages, if not by cross-fading them through a shader.
Incidentally, some sort of cross-fading shader would also be very useful to
handle the day/night transition zones, that should be quite evident when
orbiting the planet several times each day.
> From: thorsten.i.r...@jyu.fi
> To: flightgear-devel@lists.sourceforge.net
> Date: Tue, 20 Mar 2012 10:06:27 +0000
> Subject: Re: [Flightgear-devel] Earthview - Orbital terrain rendering in FG
>
> > I assume you ran into a bunch of PT_vs_hpt: ran out of layers for h=
> > messages.
> > This is from FlightGear's rather brittle atmosphere model. The attached
> > patch
> > adds a deep-space layer out to 1e9 meters. I just arbitrarily set the
> > pressure to near 0 and the temperature to damn cold. This patch let me
> > initialize a random JSBSim model at a million feet, however there were
> > still some NaNs present in the property tree when I made it back to
> > sea-level.
>
> I've successfully initialized Vostok at 1.000.000 ft after using this patch
> and sunsequently injected it into a stable orbit - basic orbital flight
> dynamics seems to be checking out well. I haven't tried flying it up yet
> (need to go through the red zone where rendering looks really ugly...). But
> thanks for the patch!
>
> > I was wondering, instead of using the Blue Marble texture it might be a
> > good idea to render our own texture using the global scenery. This
> > prevents license issues and make for a nice transition between the lower
> > landclass scenery and a global sphere at some altitude.
>
> The charm of a really dumb approach is that it's really just a textured
> sphere, i.e. texturing it a different way is really easy and should even work
> at runtime like we change aircraft liveries. Personally I prefer Blue Marble,
> but I see the sense in what you're saying.
>
> * Thorsten
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