Curt quipped: > If you want to use the same 3d model for multiple FDM configurations > which choose different reference points, then that makes life a lot > harder. I think that is what the JSBsim VRP is for.
I had to laugh when reading these two sentences together. It sort of read ( to me ) like: "The JSBSim VRP is for making life a lot harder." Ha! Some might argue that that is exactly what the VRP does. I wrote up an article on the VRP for the first JSBSim newsletter (on our site). [BTW, the second newsletter is 99% ready, I just need to tie up some loose ends, but conference preps have got me busier than usual.] Without the VRP, JSBSim would simply report the location of the CG to FlightGear. With the VRP specified in the JSBSim config file, instead of reporting the CG, JSBSim will report the lat/lon/alt (the position) of the VRP instead. By convention, we say that the nose of the aircraft is what we want the VRP to represent. This can be advantageous (I think) because everyone knows where the nose of the aircraft is. This should make 3D model placement in the scene easy. Note that I am always open to suggestions on a better way to do this. While I feel that it should not be so confusing to people (i.e. maybe there is a better way), the simple fact is that given the multiple FDMs that FlightGear supports, 3D models built by many different people, etc. maybe we would be silly to expect the simulation to do all the work - i.e. there is some thinking one has to do for all of this. In the end, all the FDM can do is to report lat/lon/alt. What this represents can be [re-]opened for discussion if need be. Jon _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d