Bill Galbraith wrote: > > > ------------------------------------------------------------------------ > *From:* [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] *On Behalf > Of *Curtis Olson > *Sent:* Tuesday, May 22, 2007 5:52 PM > *To:* FlightGear user discussions > *Subject:* Re: [Flightgear-users] Where can I get better scenery > forFlightGear, 1-arcsec SRTM. > > On 5/22/07, *Nathaniel Homier* wrote: > > FlightGear uses 90m SRTM data and I assume this is the 3-arcsec SRTM > data. I would like to have the whole world at 1-arcsec SRTM. I > tried > to build terragear but the wiki and GPC.README are a bit out of > date and > the docs suggest it would take forever to build the world scenery on > anything less than a large cluster. I was hoping that maybe someone > else already did the work for the entire world and has it up > some where > for download or for sale on DVD. > > It would be awesome if http://cdrom.flightgear.org/ offered a no > holds > barred DVD of the scenery for those with the computing power and who > don't want have to figure out Terragear and spends weeks > building the > whole planet not to mention windows users. > > > There are a couple things I can say in reply here. First the 3 > arcsec data is *huge* and in and of itself will overwhelm your > system's ability to draw all that data. We simplify the data ... > probably 1000x to make it renderable. The 1 arcsec data is nice, > but again, in order to make it workable within FlightGear, we would > have to simplify it down to about the resolution we currently have, > so the net gain would be minimal, even if you started with the > higher res data set. > > The current scenery requires 3 DVD's. A no holds barred DVD > (singular) would have to be lower res than what we have now. If we > increase the resolution substantial, then maybe we are talking about > a 6 or 20 DVD set. That would be very costly and time consuming to > produce and distribute! > > As computers get faster and capacities increase, we will definitely > increase the resolution and accuracy of the scenery, but I feel that > the current scenery set strikes a pretty good balance between > detail, render speed and size manageabilty. > > But I do se habla dinero if offered in sufficient quantities. :-) > :-) :-) > > Curt. > > > But it's possible?
Is global 1 arcsec data even available? If so then yes, it's possible - but you'll use an awful lot of resources processing the data. It's generating small areas isn't too much of a problem - last time I was running regular builds it took about a day to build scenery for the whole of the uk - that was using 4 machines in parallel. Bear in mind that at that stage it took <5 mins to build a scenery tile. With the data I have available now for roads, railways, and rivers it can take 30 mins per tile (and that reveals some problems with triangulation and texture mapping). If you're really serious, and you have the time and resources, it's possible. But it's not something you're gonna throw together in a weekend, and you should be prepared to get your hands dirty and fix the problems that higher resolution scenery reveals in terragear. -- Jon Stockill [EMAIL PROTECTED] ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Flightgear-users mailing list Flightgear-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-users
