Hi I use the following distance calculation in airspaces: have a look at https://github.com/updraft/updraft/blob/master/Updraft/src/plugins/airspaces/oaengine.cpp row 509 : double oaEngine::DistanceInMeters() A. 2012/4/24 Tomáš Zámečník <pulcik@xxxxxxxx> > I don't know how to compute distance on WGS84, maybe there are some > routines in osg/osgEarth. > Have you any idea? > Maybe it would be sufficient to subdivide the line with > osgEarth::Symbology::MeshSubdivider to some level (subdivision > step is defined with radians) and somehow take the data from it. > > T. > > > ------------ Původní zpráva ------------ > > Od: Kuba Marek <blue.cube@xxxxxxxxx> > > Předmět: [glideplan_swproj] Re: Line drawing > > Datum: 24.4.2012 00:36:21 > > ---------------------------------------- > > Is there any realistic chance someone is going to use tasks this large? > > Because if there is, then I need to fix calculations of task distance > > (now it uses euclidean distance in XYZ, it would probably be better to > > use great circle distance) > > > > K > > > > > I found an easy way how to draw lines on the earth surface. > > > It can be done with osgEarth::Symbology::MeshSubdivider, which > > > subdivides (any?) geometry according to ellipsoid surface. It's very > > > easy to use - just call one method on your geometry and specify > > > wheter you want to interpolate according to great circle or not. ...I > > > send screenshot (in attachment) of declaration of 25000km FAI > > > triangle :-) > > > > > > T. > > > > > > > > To visit archive or unsubscribe, follow: > //www.freelists.org/list/glideplan_swproj >