On Sat, 30 May 2009 21:42:55 +0200, Josef wrote in message <4a218c3f.3010...@googlemail.com>:
> leee schrieb: > > On Saturday 30 May 2009, Curtis Olson wrote: > > > >> On Sat, May 30, 2009 at 12:02 PM, Vivian Meazza wrote: > >> > >>> I don’t see much of a problem with a suitable jumper. Making > >>> it a ballistic object with drag and mass would be easy. But a > >>> more realistic FDM … Hmmm > >>> > >> An accurate FDM would be immensely complex considering all the > >> possible poses a human can achieve. But perhaps something > >> simplistic could be worked up using the arms and legs as control > >> surfaces. My focus right now is not so much getting accurate > >> free fall dynamics, but to get a nice jumper model and then just > >> hack up some sort of dynamics with approximately the right > >> lift/drag ratio for someone is a stable free fall pose. > >> > >> The goal would be to get approximately the right fall rates and > >> timings so that there is training value in solving problems and > >> overcoming various combinations of faults with in a realistic > >> time frame. It's still only a very partial simulation but > >> hopefully a step better than just sitting around in a circle > >> talking through various scenarios. > >> > >> The next step would be to have a canopy that could be configured > >> to have various problems opening up and be able to draw that > >> somehow from the perspective of the sky diver, and perhaps have > >> some appropriate dyanmics for partially tangled or partially > >> inflated chutes? Obviously there's endless variabiltiy and high > >> fidelity in all respects would be crazy to try to achieve, but it > >> would be interesting to take a few small steps forward and see > >> how far we can get. > >> > >> Best regards, > >> > >> Curt. > >> > > > > Is lift actually much of a factor in free-fall skydiving? I > > thought it was mostly just varying drag, in which case the FDM > > might be simpler than you think. For example, the YASim FDM > > assigns drag to extended gear elements, which are located at > > specific points on the aircraft and so act at those points. It > > might be possible then to hack the YASim FDM about a bit to remove > > the need to solve for cruise and approach conditions and just use > > the gear drag bits, which could then be placed and animated to > > simulate a human body. > > > > LeeE > > > Why not start by look for skydiving gps tracks on the net to come up > with a model? ..we have _some_ sanity here, "galskap" means insanity... ;o) http://filter.start.no/nettnytt/2977 -- ..med vennlig hilsen = with Kind Regards from Arnt... ;o) ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
