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On Mon, Feb 18, 2002 at 06:58:44AM -0600, Jon S. Berndt wrote:
> What are/is the way[s] a user can specify wind on the FGFS command line? All
> I can see is this:
>
> --wind=DIR@SPEED: specify wind coming from DIR (degrees) at SPEED (knots)
Correct. And that's the way it *should* be specified.
I did some testing with the command-line option, and it appears
that both LaRCSim and YASim have it backwards. If I start up
heading 270, and specify a wind 270@50, I get _tail_ wind with
these two models. That's weird, because LaRCSim used to get it
right in 0.7.8.
And guess what I discovered when diffing 0.7.8 against 0.7.9? In
Main/options.cxx, around line 900, someone *commented out* the
line "dir += 180;", thereby *changing* the definitions of
/environment/wind-{north,east}-fps! Okay, who did that? Just wait
till I get my hands on you! ;-)
> Was there a properties way to do it that is opposite to the above? Perhaps
> we are given too much power! ;-)
/environment/wind-{north,east,down}-fps
> Most/all users will only specify a from direction and speed. It would
> normally (IMHO) be up to the scenery model (giving us the terrain info) and
> the weather or FDM model to give us the up/down component, would it not?
Or by an external wind model connected through a network
interface.
> I still think our (JSBSim) approach to winds is the most
> intuitive, but I am open to debate.
Wind heading as set by the user should be *from*.
Vector representations of wind should be *to*. (imho).
- --
Regards, "I RADIS, do you?"
=Martin= http://www.iradis.org/
PGP: FE87448B DDF8 677C 9244 D119 4FE0 AE3A 37CF 3458 FE87 448B
From: Martin van Beilen <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Re: [Flightgear-devel] Wind confusion.
In-Reply-To: <001901c1b87b$ff32ebe0$[EMAIL PROTECTED]>; from [EMAIL PROTECTED] on
Mon, Feb 18, 2002 at 06:58:44AM -0600
X-S-Issue: [EMAIL PROTECTED] 2002/02/18 17:06:10
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