Thanks, this post from you has reminded me of some of the issues. Quick summary / bottom line: The OpenFlight spec states that subfaces must come after the base faces. The exporter doesn't change the ordering; for now, you'll need to ensure that your subfaces come after the base faces.
The primary intent of the FLT exporter was to support files that had been loaded from FLT, possibly modified in OSG, then exported back to FLT. In this usage case, the Geometry was already in the correct order for proper subfacing. Could we modify the exporter to produce the correct ordering? Well, yes and no. It's theoretically possible to rearrange the order to meet this FLT spec requirement. However, the spec has other requirements as well, such as: the base Face must be large enough to completely cover the area of all subfaces. I hope you agree that the exporter should _not_ check for an adequate base Face size, and enlarge it if necessary. :-) Ultimately, my philosophy is that the exporter should simply export the scene graph that it is given, without trying to be "smart" about it. I'd rather see a NodeVisitor that walks a scene graph and "preps" it for FLT export, possibly displaying warnings if it detects situations that it can't resolve. Because exporting is a const operation, this NodeVisitor would have to be run by the application prior to export, so it would need to live in osgUtil or osgSim, for example. If you would like to write a NodeVisitor to change the order of subface geometry, this would be a good start on a "FLT export prep" NodeVisitor. Perhaps Robert would add it to OSG. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com +1 303 859 9466 -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Katharina Plugge Sent: Monday, March 02, 2009 9:16 AM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] [osgPlugins] OpenFlight-Plugin - Subfaces could notbe read by OpenFlight-API Sorry for triple posting, but i have some new findings: Correctly reading in Subfaces with the OpenFlight API is dependent on the node sequence. Group - child1 = Subface Node - child2 = Other Geometry does not produce a subface in the API. Where as Group - child1 = Other Geometry - child2 = Subface Node leads to the desired result. Do I have to garantee in osg, that the order of the nodes is correct before exporting to flt, or could the plugin be adjusted to put subface childs last? The latter would help to avoid invalid results in future for people who are not aware of the problem. Greetings, Katharina ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=7776#7776 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
