On Sunday 26 Jun 2005 23:03, Vivian Meazza wrote: > Frederic Bouvier > > > Vivian Meazza a écrit : > > >I've just seen the new volumetric shadows. Brilliant!!! On > > > a Nvidia > > > > gForce > > > > >5200, the frame rate hit is about 10 in external view (I > > > can live with > > > > it) > > > > >and no noticeable effect in internal - perhaps 1 or 2. > > > > Yes, it is very nice. I have a drop of 10 fps ( 50 -> 40 ) > > when I enable all ( ac + ai + to ) > > > > >There's a bit of a funny with the interaction between the > > > Hurricane propeller disk and the ac shadow: it makes the > > > shadow disappear, and > > > > there's > > > > >something throwing a shadow on to the disk, which I've not > > > seen in real life, although I might not have noticed it. > > > Is there anything I can do within the ac model to tidy > > > this up? > > > > 2 stranges things that I know are inherent to the shadow > > volume technique > > > > 1. even when surfaces are smoothed, the shadows are hard and > > apply to a whole quad when a fuselage shadows itself ( try > > the A320, look at the airframe and press t to see what I > > mean ). > > 2. transparent surfaces ( the suspension chains of the > > bridges, or the metallic structures ) produce filled > > shadows. > > Yes, I can see that. The markings on the Hunter are on > separate transparent object: these throw a shadow. It seems as > if I'm going to abandon that method if shadows are to be > usable with that model. Pity; it saves a huge amount of > artwork and texture. The edges of the shadows are a bit too > hard; a little penumbra would be good > > > Let wait the hardware to catch up a hit, and we could have > > clouds and mountains casting shadows ;-) > > Nice if aircraft could throw shadow on cloud. > > Altogether it's a nice enhancement. > > V.
Yep - I've used the same texturing technique on a few a/c as well:( Then again, I've already stopped using it:) It did save a lot of texture space though. Re the 1st problem Fred referred to, it seems to happen when an object puts itself in shadow. Shadows cast by other objects seem to be ok. Generally, the old shading code did a good enough job of shading each individual object in a model, according to the sun pos, so I wonder if the new shadows might work better if they were only applied to other objects, and let the old code shade each individual object... LeeE _______________________________________________ Flightgear-devel mailing list [email protected] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
