> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On > Behalf Of Maik Justus > Sent: 18 December 2007 23:12 > To: FlightGear developers discussions > Subject: Re: [Flightgear-devel] External Cargo, was: Re: > screenshots (and "snapshots") > > > Hi Viviam, > Vivian Meazza schrieb am 18.12.2007 23:41: > > I've just a few moments ago added a few lines of code to > AIBallistic > > which apply an external force (using the same math as > above). The rest > > works as before. I just need few properties to set the > magnitude and > > vector of the external force and it will be done, at least for > > testing. > Thank you, very good. Is it possible to pass the forces in the earth > fixed coordinates axes base? (in Newton or pof)?
I'm planning, and have tested the passing of the force in terms of magnitude (pound force), azimuth (degrees, north = 0) and elevation (degrees, horizontal = 0, up = 90). I hope this is what you need, and can work with. > > It's trivial > > really, but I'm assuming that the external force applies no > rotational > > force to the object. > I think this could be easily faked. e.g. new_roll = old_roll + > cos(old_roll) * force_in_y_direction * a_magic_constant * dt > but i f I read the code correctly, yaw and hdg are pointing > at the speed > direction (slightly filtered)? Therefore we need something > like _elevation = atan2(force_in_z_direction,force_in_x_direction) > and then your filter to add some inertia? Right now there are 2 options - 1, the ballistic object aligns with the velocity vector (damped), or 2, it remains static. These options both work with the new code. I think option 1 will do for an under slung load? > > I haven't a great deal of time available in the run up to > Christmas so > > no promises on completion. > > > Same here. I will have very limited access to my computer (family > visiting tour). Fortunately my computer is a notebook, but I > am not sure > if there is any space in the car for my joystick. We have a horde of family visitors over the coming days - all competing for my time and the computer. We'll see how much can be done (not a lot I expect). Vivian ------------------------------------------------------------------------- SF.Net email is sponsored by: Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
