I'm glad someone else mentioned this:) I've noticed the same thing, and depending on which way you're looking, there are distinct 'ridges' or creases in the cloud layers, seemingly as a consequence of the reduced cloud layer radii.
It wasn't always this way, so I deduced that it had been done deliberately, some good reason. LeeE On Monday 22 March 2004 15:12, Curtis L. Olson wrote: > Fred, > > There is a different problem with the clouds; we need to be careful not > to get distracted with a side issue here. > > In the case of the clouds, the primary problem is that the shape of the > cloud bowl is much more curved than the shape of the earth. This means > the elevation above ground of the clouds at some distance away is much > lower than the elevation of the clouds at the view point. > > This doesn't show up much in flat areas, but you can *really* see it in > mountainous areas. The cloud "bowl" is centered around the view point, > so as you fly, watch the clouds that appear in front of mountains, as > you get closer they will raise up and the intersection point will change. > > This is a primarily a problem with the shape of the cloud bowl, and not > a problem with transparency or draw order or alpha test or anything like > that. > > Ideally, the curvature of the cloud bowl should closely match the > curvature of the surface of the earth which is *nearly* flat within > visible distances. I would propose that a flat plane would more > accurately match reality that our super hyper exagerated cloud bowl does > now. > > The person who added the clould bowl was trying to make the clouds fade > at the horizon, but I'm not sure this is the best way to go about it. > > Regards, > > Curt. > > Frederic BOUVIER wrote: > >I noticed that at KSFO too. The problem with clouds is rather tough. > >Without alpha-test, we wouldn't see anything above clouds from below. > >The bottom of clouds ( the side of the quad pointing downward ) is > >drawn before the scene and the upper side after so we can see clouds > >through bridges or trees. This was needed before alpha test was used > >in models ( although I think alpha-test is not used yet for trees ). We > > can try to come back to the previous situation where all sides of clouds > > are drawn after the scene and rely on alpha test. There will be an ugly, > > not blended border around transparent patterns but It could be > >acceptable if it only show up at close distance. > > > >We can also begin to think about a multi pass method that would : > > 1. draw the clouds above the viewer without depth update, > > 2. draw the scene, > > 3 .redraw the clouds above with depth test > > > >With an impact on framerate due to double writing and problem like > >the one Melchior is experiencing with overlapping semi transparent > >objects. Haven't thought about it much of that. > > > >-Fred > > > > > >_______________________________________________ > >Flightgear-devel mailing list > >[EMAIL PROTECTED] > >http://mail.flightgear.org/mailman/listinfo/flightgear-devel _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
