Hej Thorsten! :)
> From: thorsten.i.r...@jyu.fi
> To: flightgear-devel@lists.sourceforge.net
> Date: Mon, 1 Jul 2013 06:10:52 +0000
> Subject: Re: [Flightgear-devel] Grass airfield texture distortion in ALS
>
> > 1. I noticed some distortion in the texture placement in grass airfields
> > when using the ALS.
> >
> > Here are some snapshots:
> > --basic shader: http://imageshack.us/f/15/p917.png/
> > --ALS: http://imageshack.us/f/196/9lcl.png/
> > --Rembrandt: http://imageshack.us/f/839/4ll1.png/
> >
> > The shots are from ESSZ, although I see it in other grass airfields as
> > well.
> > Version: latest GIT simgear/FG/fgdata (2013-06-30, 20:30UTC).
> > The distortion was there before I upgraded to today's Git...
>
> Difficult to see if the others are distorted or not, seems to be just to be a
> homogeneous color >where no distortion could be seen. This is probably
> related to what I'm seeing with the runway >shader effect.
>
> I haven't touched either shader code for at least 6 months, so... something
> has somehow >happened to the process creating the runway uv-mapping (normals?
> tangents?) which screws >up the shaders specifically on runways. Now, since
> not everyone sees it, I first suspected >some hardware specific quirk, but
> James is running pretty much the same hardware and >apparently doesn't get
> any problems. Thus, the next culprit which I can think of is that I >compile
> under Linux against OSG 3.0.1 rather than latest, and it appears that OSG
> specifics >can also throw the other shaders off track as reported during the
> last days.
>
> So my current suspicion is that we're dealing with some OSG change here where
> dependence >on OSG devel versions has somehow crept into the FG/SG code and
> leads to problems with >runways when compiling against OSG last stable. Beats
> me why this is runway specific, but I >would observe if it goes away once the
> OSG issues are tackled.
Hmmm... I see. I haven't updated OSG, I am running still on 3.0.1. I'll try to
recompile and everything else then when I get home and let you know.
> > 2. I also noticed in ALS, that the Mie Factor slider is locked in 0.005,
> > and the other two slider do just nothing when changing their values
> > except from momentary flashes in the sky. This was not happening before
> > today's update...
>
> Should they be doing anything? Rayleigh, Mie and density factors should now
> be controlled >by Basic Weather as well as Advanced Weather after Stuart's
> work on making Basic Weather run ALS better - so as far as I know the sliders
> should in fact be obsolete. Maybe Stuart can comment?
>
> Definitely they should be non-functional (or even absent) when Advanced
> Weather is running.
Ok, cool! I thought it was a bug... I'll check it without Advanced Weather and
see if there are any problems.
Thanks! :)
/Kleo
SE-MUA
> * Thorsten
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