On Sunday 13 May 2007, Bill Galbraith wrote:
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] On
> > Behalf Of Stefan Seifert
> > Sent: Saturday, May 12, 2007 10:38 PM
> > To: FlightGear developers discussions
> > Subject: Re: [Flightgear-devel] More ideas on dogfighting
> >
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > James Palmer wrote:
> > > In your experience, Harald, what has been the approximate
> >
> > ratio of FDM
> >
> > > vs Graphics vs remainder code on CPU time? Has anyone done work on
> > > clocking the various subroutines in FG to determine this?
> >
> > (Perhaps I
> >
> > > underestimate the CPU time required of the FDM?)
> >
> > You could simply run stand-alone JSBSim
> > (http://www.jsbsim.org) to see, how much CPU a FDM needs. I'd
> > guess that Yasim lies in the same range.
> >
> > Nine
>
> I think that was investigated a few months ago. JSBSim FDM took only a
> couple percent of the CPU, or course depending on your hardware and what
> you were drawing. I don't think it's anything that you need to worry about.
The FDM part is very cheap.
What takes time is the intersection tests.
I have a half ready bv tree implementation here that will speed that up.
The most important thing here is to get movements right - that is to move
correctly on the carrier for example ...
Having a better collision detection will enable many ten aircraft simulated on
an average current cpu.
Greetings
Mathias
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