Joacim Persson wrote:
> #1 (below) is a call to localWind for the thruster calculations, only the
> thruster
> altitude is NAN.
>
> "_global_ground" are all NAN:s too. But I think by then, my insane turns had
> become insane loopings. (Hard to tell with the view flipping around like
> that.) I can't see where the NAN value of _global_ground came from, from a
> stack backtrace, so the lead ends there.
>
Hi Joacim,
to find the line, where the NAN is generated you can easily switch on
the floating point exceptions while the FDM is calculating.
e.g. for windows:
file model.cpp in FDM/YASim:
add
#include <windows.h>
#include <float.h>
and change the function void Model::iterate():
void Model::iterate()
{
_clearfp();_controlfp(
0|_EM_INEXACT|_EM_INVALID|_EM_UNDERFLOW/*|_EM_OVERFLOW|_EM_DENORMAL*/,
_MCW_EM );
initIteration();
initRotorIteration();
_body.recalc(); // FIXME: amortize this, somehow
_integrator.calcNewInterval();
_clearfp(); // always call _clearfp before enabling/unmasking a FPU
exception
_controlfp( _MCW_EM , _MCW_EM );
}
for an other compiler it should be similar (in bootstrap.cxx you can
find some examples).
Maik
Maik
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