This is from Ben Supnik, one of the X-Plane graphics devs: ---- X-Plane's taxiway lines are based on draped lines (e.g. it's the same as the .lin files) - it's basically an extruded polygon-offset quad strip where the ends are height-tested against the terrain.
The runways are just pre-painted whole tiles...you can see the individual texture tiles in the terrain resources folder. If anyone from FG is trying to get apt.dat 850 working in FG, they can email me and I will be happy to answer q's; when Robin, Sergio and I worked on apt.dat 850, I tried to stay in touch with some of the FG people to make sure we didn't come up with something that would hose them (and in fact the apt.dat 850 sign syntax originated in FG), but when I last checked FG hadn't jumped on full adoption. ---- Right. A fair amount of care must be taken to prevent z buffer chaos. For the lines we get away with anchoring them longitudinally (and cutting them on the mesh) but _not_ laterally...this only works because (1) they are thin and (2) airports tend to be flat. This is one of the reasons why no 'wide area' pattern exists as a line type. Texture generation is of course the alternate choice but it requires having a dynamic texture paging LOD system that can run up to very high res to prevent fuzziness. --- I hope this helps... g. -- Proud owner of F-15C 80-0007 http://www.f15sim.com - The only one of its kind. http://www.simpits.org/geneb - The Me-109F/X Project ScarletDME - The red hot Data Management Environment A Multi-Value database for the masses, not the classes. http://www.scarletdme.org - Get it _today_! Political correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end. ------------------------------------------------------------------------------ Protect Your Site and Customers from Malware Attacks Learn about various malware tactics and how to avoid them. Understand malware threats, the impact they can have on your business, and how you can protect your company and customers by using code signing. http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ Flightgear-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-devel
