> De: "James Turner" > > On 16 Oct 2012, at 13:38, Tim Moore wrote: > > > The tile data on disk is actually stored in a > > coordinate system that is aligned with the earth-centric system, so > > Z > > points to the north pole. We rotate the coordinates back to a local > > coordinate system because that provides a much more useful bounding > > box for intersection testing and culling... and also lets you > > program > > snow lines in shaders :) > > Uh, are you sure about that? My understanding is that the BTG coords > on the disk are in 'tile local' coords, i.e 'Z is up'
BTG are in cartesian coordinates and are rotated at load time here : http://gitorious.org/fg/simgear/blobs/next/simgear/scene/tgdb/obj.cxx#line923 Regards, -Fred ------------------------------------------------------------------------------ Don't let slow site performance ruin your business. Deploy New Relic APM Deploy New Relic app performance management and know exactly what is happening inside your Ruby, Python, PHP, Java, and .NET app Try New Relic at no cost today and get our sweet Data Nerd shirt too! http://p.sf.net/sfu/newrelic-dev2dev _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
