Thank you Adrian, You have much cleared my doubts in YASIM with regards to contact point issues.
As for Gears sinking into the ground, even adding a fake gear was not much of a help. Later i got reply from Andres and he was mentioning the origin offset could be the cause and he seems right on that. I will be replying him on that soon, please look out for that reply. Once again, thank you for your valuable input Much appreciated Txs On Monday 27,June,2011 08:56 PM, Adrian Musceac wrote: > On Sunday, June 26, 2011 17:27:06 xsaint wrote: >> Hello All... >> >> I am trying to better understand how YASIM calculates its contacts >> points.... >> > Hi there, I'll try to answer, see below: > > >> 1) As from my experience, the SIM crashes when some part of the wings >> comes in contact with a building or ground and it does not crash if >> other parts of the wings hit the ground of a building.The wing >> specification is correct in FDM as checked againts the blender script. >> So how does it deduce the contact points? >> > There might be a difference between regular collision detection provided by > the FG engine itself, about which I have no information, and YASim _ground_ > collision detection. The latter is implemented as follows: > Contact points (internally represented as gear objects but with special > properties and hardcoded values for friction) are compiled from the wingtips > and the fore and aft tips of the fuselage. These contact points will hold at > full compression 10 times the plane's mass. > So for a conventional airplane there will be two contact points for the > fuselage (nose and tail), the main wing tips, the tips of the horizontal and > vertical stabiliser. Any collision detected with these contact points will be > treated by YASim as a special case of gear collision and compared to the force > mentioned above. > >> 2) Eventhough CG looks like it is in correct place, in YASIM, the plane >> do sink to the ground before take off. Insufficient lift maybe.... but >> the back of the fuselage do sink into the runway. As such, as >> possibility of implementing tail strikes? >> > It is possible that either the aft end of the fuselage as defined in XML is > higher than the lowest part of the model, or that the mass which it has to > sustain is larger than the spring compression of the contact point can > sustain. You can try to compensate the first issue by placing a fake gear > object at the lowest point where the fuselage touches the ground. > >> Much all appreciate all valuable replies and also if you could point me >> towards any valuable YASIM documents. >> > There is a technical document floating on the web, can't quite remember where > but try to google YASim-simnotes.pdf > Other than that, your best reference is the source code. > Hope it helps, > > Adrian > > > ------------------------------------------------------------------------------ > All of the data generated in your IT infrastructure is seriously valuable. > Why? It contains a definitive record of application performance, security > threats, fraudulent activity, and more. Splunk takes this data and makes > sense of it. IT sense. And common sense. > http://p.sf.net/sfu/splunk-d2d-c2 > _______________________________________________ > Flightgear-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/flightgear-devel ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2d-c2 _______________________________________________ Flightgear-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-devel
