On Monday 25 August 2008 23:08, Martin Spott wrote: > Now, finally the secret behind the funny behaviour was disclosed to me > - and it's so bizarre that I'd like to share it with you: > The AC3D loader in OSG works properly - obviously. But FlightGear has > to switch the orientation when loading AC3D models in order to comply > with the mis-behaviour of the formerly used AC3D loader in PLIB. > Instead, for all the other file formats, FlightGear relies on proper > orientation - which is why the Golden Gate bridge looks so strange when > converted into .ive
Well you need to say why this happes: The old FlightGear scenegraph did that axis conversion in the plain model loader. So that happened at a time where you were not able to get rid of that effect. Therefore we have magnitudes of models that are oriented wrong. So this happens for compatibility with existing models in flightgear in the read callback of osgdb. Note that this callback also modifies the materials that are read as is from the ac file by osg's ac loader. But the old plib stuff did not use one of the color components as is but replaced that with something different. So to have the same appearance of ac models in flightgear, the reader callback also cripples that materials past loading ... Backward compatibility is something really good ... Greetings Mathias -- Dr. Mathias Fröhlich, science + computing ag, Software Solutions Hagellocher Weg 71-75, D-72070 Tuebingen, Germany Phone: +49 7071 9457-268, Fax: +49 7071 9457-511 -- Vorstand/Board of Management: Dr. Bernd Finkbeiner, Dr. Florian Geyer, Dr. Roland Niemeier, Dr. Arno Steitz, Dr. Ingrid Zech Vorsitzender des Aufsichtsrats/ Chairman of the Supervisory Board: Prof. Dr. Hanns Ruder Sitz/Registered Office: Tuebingen Registergericht/Registration Court: Stuttgart Registernummer/Commercial Register No.: HRB 382196 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
