e airframe.
Richard
> -Original Message-
> From: David Culp [mailto:[EMAIL PROTECTED]
> Sent: 04 July 2003 5:19 pm
> To: FlightGear developers discussions
> Cc: JSBSim list
> Subject: Re: [Flightgear-devel] REference
>
>
> So, the distance (x,y,z) to the model refe
So, the distance (x,y,z) to the model reference point will have to change as
the CG moves, right? If the x-offset is -240 inches at the beginning of the
simulation, and I make the CG move an inch aft instantaneously, then I need
to (during the same dt) reset the x-offset to -241 inches.
That s
Jon Berndt wrote:
Jim wrote:
Before we get too worked up about this... It has absolutely
nothing to do with modeling the aircraft. It is only a reference
point for positioning the 3D model in the scene. All the nose is,
sans pitot tubes and other items that are not centered,
Martin Spott <[EMAIL PROTECTED]> said:
> "Jim Wilson" <[EMAIL PROTECTED]> wrote:
> > Martin Spott <[EMAIL PROTECTED]> said:
>
> > Before we get too worked up about this... It has absolutely nothing to do
> > with modeling the aircraft. It is only a reference point for positioning the
> > 3D mod
"Jim Wilson" <[EMAIL PROTECTED]> wrote:
> Martin Spott <[EMAIL PROTECTED]> said:
> Before we get too worked up about this... It has absolutely nothing to do
> with modeling the aircraft. It is only a reference point for positioning the
> 3D model in the scene. All the nose is, sans pitot tubes
Lee Elliott <[EMAIL PROTECTED]> said:
> I became aware of the consequences of disparity between model and fdm
> co-ordinates when I first started doing models for FG. When using different
> x datums for model and fdm I could clearly see the a/c rotating about
> incorrect axis.
>
> What I do n
Jon Berndt <[EMAIL PROTECTED]> said:
> With this in mind, now, we go back to the stated problem. Let's say we
> (FDM/JSBSim) are reporting the lat/lon of the nose of the aircraft to
> FlightGear's visual subsystem. We know where our CG is in lat/lon, and we
> know where the nose is relative to tha
On Friday 04 July 2003 15:18, Jon Berndt wrote:
> Jim wrote:
>
> > Before we get too worked up about this... It has absolutely
> > nothing to do with modeling the aircraft. It is only a reference
> > point for positioning the 3D model in the scene. All the nose is,
> > sans pitot tubes and othe
Jim wrote:
> Before we get too worked up about this... It has absolutely
> nothing to do with modeling the aircraft. It is only a reference
> point for positioning the 3D model in the scene. All the nose is,
> sans pitot tubes and other items that are not centered, is a
> location easy to ident
Martin Spott <[EMAIL PROTECTED]> said:
> The nose simply is a point of less relevance to the aircraft compared to
> things like wing root for example. After modifications to the wing root of a
> (real) airplane you are still able to extrapolate the 'original' reference
> point. This is impossible
On Fri, 4 Jul 2003 13:31:22 +0200,
Arnt Karlsen <[EMAIL PROTECTED]> wrote in message
<[EMAIL PROTECTED]>:
..and are we triggerhappy today... ;-)
> ..the common way to do it,
...is (not it)
> it
> use the
...wings...
> main spar and add some idiot length vector _way_ out thru the nose
..stretch the plane and the mid point moves...
..the common way to do it, it use the main spar and add some idiot
length vector _way_ out thru the nose, and use that as origo.
--
..med vennlig hilsen = with Kind Regards from Arnt... ;-)
...with a number of polar bear hunters in his ancestry...
Erik Hofman <[EMAIL PROTECTED]> wrote:
> How about the center of all (runway) contact points?
> In the case of a normal airplane that would be on the the centerline,
> ground level and exactly between the maingear and the nosegear/tailgear.
It depends on how precise the numbers are that are avai
Martin Spott wrote:
Hey, Jim, I don't want to attack you personally. I'd just want to weigh in
_against_ the aircraft nose as a reference point, because I'm convinced that
it is not suited for the purpose,
How about the center of all (runway) contact points?
In the case of a normal airplane that w
I forgot to add details .
Martin Spott <[EMAIL PROTECTED]> wrote:
> [...] When you're modelling an aircraft, nothing it that much
> likely to vary than the nose and the tail because the manufacturer probably
> has modified the plane and there exist different versions with different
> noses (t
"Jim Wilson" <[EMAIL PROTECTED]> wrote:
> So long as we knew where 0,0,0 is. The ac3d model for the p51d has 0,0,0 at
> the nose. It seems like a clear easy to understand reference point.
Although it might be easy to understand, this definitely misses the idea of
a reference point. When you're
Jon Berndt <[EMAIL PROTECTED]> said:
> Jim:
>
> Do we still have an issue with aa hard reference point between the 3D model
> and the FDMs?
Yes...well YASim always had one just by the nature of how it's configured.
It'd be good to have a standard.
> I've been thinking about this some more, an
Jim:
Do we still have an issue with aa hard reference point between the 3D model
and the FDMs?
I've been thinking about this some more, and I think we might be able to
supply the location of the 0,0,0 point in the FDM structural frame, in which
the aircraft is defined. Would this be helpful?
Jon
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