Jon Berndt <[EMAIL PROTECTED]> said: > > IMHO it'd make the most sense to put the offset (from the nose or > > tail) to the > > 3D model origin location into the FDM's aircraft config xml file. This > > location should be on the leading edge of the wings and z axis > > centered on the > > nose as described above. The 3D modeler's could refer to that data for > > getting the model right, and the fdm should simply report lon/lat/alt > at > > *that* location. This is how the YASim 747 currently works and > > it seems fine. > > > Maybe I am off=base on this, or misunderstanding the problem, but in my > previous experience with 3D modeling and IRIXGL some years ago one had to > be careful where the origin of the 3D model was, and the order of > rotation/translation. This is what I interpret your concern to be about.
Nope. We've got that covered. What I'd like to see is the reported position data (lon/lat/alt) be at a location in the aircraft which lines up with the leading edge of the wing and on the longitudinal axis. For example, the light grey lines in this image more or less illustrate the kind of location (although this example is maybe slightly aft): http://www.spiderbark.com/fgfs/u3aorigin.png That really could be developed as a standard, and specified in the terms you suggest. However, we can translate any origin you choose. That one just seemed to be the easiest as it'll work for the current rendering code without incorporating new offsets. Really we just need the FDMs to agree on something. Or maybe not...maybe the idea of sharing 3DModel configs between FDMs (c310-jsbsim, c310-yasim pointing to the same model.xml) is impratical or too complex? Certainly if one FDM models gear compression and the other doesn't, that is an issue when it comes to configuring the 3d model. Best, Jim _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
