Re: [Flightgear-devel] Class-based MP aircraft visibility
On Tue, May 25, 2010 at 5:05 PM, Chris O'Neill wrote: > On Tue, 2010-05-25 at 15:45 +0200, Csaba Halász wrote: >> On Tue, May 25, 2010 at 10:32 AM, Stuart Buchanan wrote: >> > >> > I wonder if it would be worth having a "child-friendly" MP Group (I >> > think this term >> > is easier to understand than "usage class")? >> >> So it should be possible to be a member of multiple groups. I am >> "child-friendly" (intend to be, anyway) *and* use fgcom. >> > > That was going to be my next question... whether (or not) I could be a > member of more than one group? I agree that this should be included in > the functionality, although if forced to "pick one" I could live with > that. Personally I'm not very keen on the idea of selecting multiple groups: Presumably one would display an aircraft if it was a member of any group you were displaying? To me that makes it likely that people will choose to be members of every group, which largely removes the advantage of the function. (It's also significantly harder to implement, particularly if allowing arbitrary group names.) So, perhaps a "child-friendly" group wouldn't quite work. Maybe we'll just have to filter on the clients, or on the mpserver? -Stuart -- ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] YASim "effectiveness" tag
Andy, James, & Syd, Much thanks for helping me understand this. -Gary On Wed, May 26, 2010 at 12:24 PM, Andy Ross wrote: > On 05/26/2010 12:44 AM, James Turner wrote: >> This is a wild guess, but from memory (of discussions here), and reinforced >> by the code snippet above, effectiveness is a hack/tweak to account for >> surfaces/controls that work better/worse than YASim predicts. So >> effectiveness of 1.1 makes the flaps 10% more effective. I would assume it's >> a tweak so you can say, well, the model is basically okay, but it doesn't >> respond to xyz quite right. > > Heh, I actually noticed my name on the list in time to respond this time! > > Yes, this is exactly right. The effectiveness is just a scalar > multiple on all force produced by the component which is otherwise > (mostly) linear with surface area. It's a useful lever for tuning, > but if you find you need to go beyond a factor of two (i.e. 0.5 - 2.0) > I'd look elsewhere for the problem. > > Andy > > -- > > ___ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel > -- ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] YASim "effectiveness" tag
On 05/26/2010 12:44 AM, James Turner wrote: > This is a wild guess, but from memory (of discussions here), and reinforced > by the code snippet above, effectiveness is a hack/tweak to account for > surfaces/controls that work better/worse than YASim predicts. So > effectiveness of 1.1 makes the flaps 10% more effective. I would assume it's > a tweak so you can say, well, the model is basically okay, but it doesn't > respond to xyz quite right. Heh, I actually noticed my name on the list in time to respond this time! Yes, this is exactly right. The effectiveness is just a scalar multiple on all force produced by the component which is otherwise (mostly) linear with surface area. It's a useful lever for tuning, but if you find you need to go beyond a factor of two (i.e. 0.5 - 2.0) I'd look elsewhere for the problem. Andy -- ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] YASim "effectiveness" tag
On 26 May 2010, at 00:47, syd adams wrote:
> Hi Gary ... Ive wondered about this myself.
>
> Found this section in YASim/Surface.cpp :
>
>
> // Similar to the above -- interpolates out the flap lift past the
> // stall alpha
> float Surface::flapLift(float alpha)
> {
> float flapLift = _cz * _flapPos * (_flapLift-1) * _flapEffectiveness;
>
>
> Hopefully Andy can explain it in layman's term :)
This is a wild guess, but from memory (of discussions here), and reinforced by
the code snippet above, effectiveness is a hack/tweak to account for
surfaces/controls that work better/worse than YASim predicts. So effectiveness
of 1.1 makes the flaps 10% more effective. I would assume it's a tweak so you
can say, well, the model is basically okay, but it doesn't respond to xyz quite
right.
All based on zero direct information from Andy, BTW!
James
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