I have _probably_ found at least one reason for this bug. I was able to constantly create a FPE when running fgfs --enable-fpe and /sim/traffic-manager/enabled=true I was able to locate the offending code in FGAISchedule::update when the new position of some AI aircraft was calculated by multiplying the start position with a rotation matrix.
When computing the geodetic position from cartesian coordinates in current = SGGeod::fromCart(newPos); it happened, that within SGGeodesy::SGCartToGeod() the value for 's' was _very_ close to zero and slightly negative causing sqrt(s*(2+s)) fail which is ony defined for s greater or equals zero or less than or equals -2. The workaround clamps 's' to values greater than zero. This is probably mathematically incorrect but should keep us running. Maybe someone who fully understands the math in this method can explain, if 's' ever can legally go negative or if this is a rounding error. Greetings, Torsten ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
