Dear George,thank you for your reply. I have downloaded the application you
suggested me but I did not find what I need.In my scenario I have a simulation
platform the determines orientation, position and velocities of several
aircrafts; what I want to do is to send this information to a fgear multiplayer
server by means of Flight Gear Multiplayer Protocol.
I tried to use (by porting them into C# code) the following code snippets (from
multiplay.cxx and multiplaymgr.cxx):
// multiplay.cxx --------------------------------------------------------------
// The quaternion rotating from the earth centered frame to the //
horizontal local frame SGQuatf qEc2Hl = SGQuatf::fromLonLatRad((float)lon,
(float)lat); // The orientation wrt the horizontal local frame float
heading = ifce->get_Psi(); float pitch = ifce->get_Theta(); float roll =
ifce->get_Phi(); SGQuatf hlOr = SGQuatf::fromYawPitchRoll(heading, pitch,
roll); // The orientation of the vehicle wrt the earth centered frame
motionInfo.orientation = qEc2Hl*hlOr;
// multiplayermgr.cxx
-------------------------------------------------------------- SGVec3f
angleAxis; motionInfo.orientation.getAngleAxis(angleAxis); for (unsigned i =
0 ; i < 3; ++i) PosMsg.orientation[i] = XDR_encode_float (angleAxis(i));
However, using the above code snippets I am not able to get "good" orientation
values; for instance consider the following values...
lon = 0lat = 0heading = 0pitch = 0roll = 0
from these values I get the following orientation values...
qEc2Hl:X: 0Y: -0,7071068Z: 0W: 0,7071068
hlOr:
X: 0Y: 0Z: 0W: 1
qEc2Hl*hlOr:X: 0Y: 0Z: 0W: 1
AngleAxis[]:X: 0Y: -0,999999965771459Z: 0
Can you help me with this issue?Thank you in advance for your support and
cooperation.Kind regards
Marco
> Date: Mon, 31 Aug 2009 11:36:03 +1000
> From: george.patter...@gmail.com
> To: flightgear-devel@lists.sourceforge.net
> Subject: Re: [Flightgear-devel] MP Protocol - aircraft orientation
>
> 2009/8/31 Marco Lecora <lecora_ma...@hotmail.it>:
> > Hi,
> > I need to send from a C# application the position of several aircrafts to a
> > flight gear multiplayer server.
> > The question is ... how can I get the aircraft orientation values from
> > position, yaw, pitch and roll?
> > thank you in advance.
> > marco
> >
>
> Hi Marco,
>
>
> You are wanting to use the so-called generic protocol. This allows you
> to log what you wish.
>
> I found that the link below was very thorough. While I did not run the
> compiled binary (no MS Windows here), the set up instructions are
> very clear and helpful. (Especially if you are writing your own
> server.)
>
> http://geoffmclane.com/fg/fgfs-046.htm
>
> Let us know if you get stuck.
>
>
>
> George
>
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