> I'd be interested to run such a comparison myself. Could you translate > the described conditions into a set of command line parameters against > 'default' FlightGear/GIT startup so I/we can make sure not to interfere > with local customizations ?
I don't think it can be done from the command line - you'd have to go into the Nasal code. The reason is that the systems are rather different. Global weather creates a cloud layer and visibility according to your specifications, local weather tries to approximate the physics of a convective layer given your position. As a result, 'high pressure' in local weather will be much faster at 4 am, because there's no significant convective activity at night, hence you won't get many clouds. Likewise it will never produce a dense cloud layer over the ocean. On the other hand, at noon over city terrain (which heats quite well in the sun), it will produce you 7/8 to 8/8 coverage and hence run slower than the standard 3d clouds. So you need to visually select a situation in which the coverage produced by local weather corresponds to the 'scattered' setting of the standard 3d clouds, taking into account the fact that the size and size distribution of clouds produced by the systems is rather different (local weather tends to create large clouds by fewer, larger higher resolution textures where the standard 3d clouds use more cloudlets). Local weather also sets visibility and layer altitude probabilistically within given limites, also taking into account the terrain elevation. You can't force it to create a layer at a user-specified altitude unless you change the Nasal calls. The way I did the comparison was to first have local weather create me a cloud layer, then set manually the cloud visibility range to 20 km in the property tree (more exact than the menu slider), note the visibility and layer altitude and then the framerate. Then I deleted all clouds (keeping the visibility) and used the 'clouds' menu (which should now be global weather) to create a layer at the same altitude with approximately the same coverage (here's where some eyeballing comes in, but you should in principle be able to quantify the coverage you see exactly by looking down from 50.000 ft, take a screenshot and measure the area covered by clouds). For all this I used the UFO (which may go some way explaining the relatively high framerate counts). Cheers, * Thorsten ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
