... while all these wonderful *uiuc-set.xml airplanes are now being buried alive, I have a few simple questions (multiple choice):
What is the variable that dictates where the little green HUD center dot goes? (OK, things in the uiuc_gear code have an effect on this mystery variable, but the uiuc_gear code has not changed. Something getting stuffed to uiuc_gear has changed(?).) In the recent past did we use +z down, and now we're using +z up (with respect to the view code and this pesky little green dot)? [a] Given that things did work and now they don't, and [b] given that JSBSim models do not have these problems while the UIUC models now do (as does LaRCsim C172 which at first I thought was OK!), does this give anyone clues that they could give to me? Who can raise their hand and say: "I changed XYZ code. Go here ..." For extra credit --- Am I getting warm? :) Thanks! (Andy, Thanks for your comments.) At 4/11/02, you wrote: >The convention for moving models for flight simulation visual system >is for the origin to be at the CG location for aircraft models. The >coordinate system that we use on our "heavy iron" visual system is +y >out the nose, +x to the right and +z up. For an industry disertation on >the subject there is a paper on the MultiGen site located at: >http://www.multigen.com/support/dc_files/wrm.pdf > >enjoy > >Andy Ross wrote: > > > > Michael Selig wrote: > > > I can ask this differently. What sets the height above the runway of > > > the hud-ladder target spot (wrt the 3D model view) --- ie the center > > > spot? For c310-yasim and c172-larcsim, it's above the runway. For > > > UIUC models, it's below the runway (a recent change). > > > > Where are you placing the coordinate origin of the aircraft? There > > was a confusion/unification about this recently, with the consensus > > being that the origin should be, by convention, at the front of the > > aircraft (either the nose or the firewall, depending on who you ask). > > Strictly, the coordinate origin of the aircraft and the 3D model > > should be exactly coincident (or as coincident as practical, given > > that there are multiple FDMs and a model file that all have to agree). > > > > If the UIUC models are reporting an altitude of zero while on the > > ground, you'll see this effect. The real altitude should be a few > > feet -- however high the nose rests off the ground. > > > > Andy > > > > -- > > Andrew J. Ross NextBus Information Systems > > Senior Software Engineer Emeryville, CA > > [EMAIL PROTECTED] http://www.nextbus.com > > "Men go crazy in conflagrations. They only get better one by one." > > - Sting (misquoted) > > > > _______________________________________________ > > Flightgear-devel mailing list > > [EMAIL PROTECTED] > > http://mail.flightgear.org/mailman/listinfo/flightgear-devel > >-- >Bruce Finney [EMAIL PROTECTED] >Auburn, WA > >_______________________________________________ >Flightgear-devel mailing list >[EMAIL PROTECTED] >http://mail.flightgear.org/mailman/listinfo/flightgear-devel ************************************************** Prof. Michael S. Selig Dept. of Aero/Astro Engineering University of Illinois at Urbana-Champaign 306 Talbot Laboratory 104 South Wright Street Urbana, IL 61801-2935 (217) 244-5757 (o), (509) 691-1373 (fax) mailto:[EMAIL PROTECTED] http://www.uiuc.edu/ph/www/m-selig http://www.uiuc.edu/ph/www/m-selig/faq.html (FAQ) ************************************************** _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
