Curt,
Using the same comparison here between the submodel wind and the particle
wind, there is still an error. The particle contrail is still at an angle to
the aircraft axis.
I will investigate some more.
Vivian
-----Original Message-----
From: Curtis Olson [mailto:[email protected]]
Sent: 22 July 2010 16:28
To: FlightGear developers discussions
Subject: Re: [Flightgear-devel] weather conditions and winds aloft
notworking correctly..
Replying to my own message ... I see a couple simple code cleanups in my
first patch so don't worry too much about that. I've been flying tight
level circles in a variety of wind conditions (up to 70 kts) with smoke
turned on and when I come around and start the circle again, I've been
flying into the tail of my own smoke now no matter what the wind is doing.
So I think that's how it's supposed to work. It looks *much* better.
Curt.
On Thu, Jul 22, 2010 at 9:55 AM, Curtis Olson wrote:
On the topic of the partical system and the wind vector not being correct.
I have a patch here that seems to be working, and it would be great if a few
other people could test/review it to see if it makes sense. This is the
first time I've dove into the particle system code and the environment
manager has always been a bit of a beast. There's probably a better way to
do this, but as I worked my way through the logic, this is what I ended up
with that made sense to me.
SIMGEAR PATCH:
diff --git a/simgear/scene/model/particles.cxx
b/simgear/scene/model/particles.cxx
index 0803790..acac7df 100644
--- a/simgear/scene/model/particles.cxx
+++ b/simgear/scene/model/particles.cxx
@@ -62,11 +62,13 @@ void GlobalParticleCallback::operator()(osg::Node* node,
osg::NodeVisitor* nv)
osg::Matrix om(toOsg(q));
osg::Vec3 v(0,0,9.81);
gravity = om.preMult(v);
+ // NOTE: THIS WIND COMPUTATION DOESN'T SEEM TO AFFECT PARTICLES
const osg::Vec3& zUpWind = Particles::getWindVector();
- osg::Vec3 w(zUpWind.y(), zUpWind.x(), - zUpWind.z());
+ osg::Vec3 w(zUpWind.y(), zUpWind.x(), -zUpWind.z());
wind = om.preMult(w);
- //SG_LOG(SG_GENERAL, SG_ALERT, "wind
vector:"<<w[0]<<","<<w[1]<<","<<w[2]<<"\n");
+ // SG_LOG(SG_GENERAL, SG_ALERT,
+ // "wind vector:" << w[0] << "," <<w[1] << "," << w[2]);
}
diff --git a/simgear/scene/model/particles.hxx
b/simgear/scene/model/particles.hxx
index 6dda343..3fd3ccb 100644
--- a/simgear/scene/model/particles.hxx
+++ b/simgear/scene/model/particles.hxx
@@ -257,6 +257,14 @@ public:
* magnitude is the velocity in meters per second.
*/
static void setWindVector(const osg::Vec3& wind) { _wind = wind; }
+ static void setWindFrom(const double from_deg, const double speed_kt) {
+ double map_deg = 0.0 - from_deg;
+ double map_rad = map_deg * SG_DEGREES_TO_RADIANS;
+ double speed_mps = speed_kt * SG_KT_TO_MPS;
+ _wind[0] = cos(map_rad) * speed_mps;
+ _wind[1] = sin(map_rad) * speed_mps;
+ _wind[2] = 0.0;
+ }
static const osg::Vec3& getWindVector() { return _wind; }
protected:
float shooterExtraRange;
FLIGHTGEAR PATCH:
diff --git a/src/Environment/environment_mgr.cxx
b/src/Environment/environment_mgr.cxx
index 15268f9..17d1e36 100644
--- a/src/Environment/environment_mgr.cxx
+++ b/src/Environment/environment_mgr.cxx
@@ -295,7 +295,10 @@ FGEnvironmentMgr::update (double dt)
osg::Vec3 windVec(-_environment->get_wind_from_north_fps(),
-_environment->get_wind_from_east_fps(),
_environment->get_wind_from_down_fps());
- simgear::Particles::setWindVector(windVec * SG_FEET_TO_METER);
+ // simgear::Particles::setWindVector(windVec * SG_FEET_TO_METER);
+ double wind_true_deg = _environment->get_wind_from_heading_deg();
+ simgear::Particles::setWindFrom( wind_true_deg,
+ _environment->get_wind_speed_kt() );
}
FGEnvironment
Curt.
On Thu, Jul 22, 2010 at 4:25 AM, Stuart Buchanan wrote:
On Wed, Jul 21, 2010 at 5:00 PM, Torsten Dreyer wrote:
> I don't know if it's somehow related, but the 3d clouds don't seem to
drift
> with the wind, either. Flying with crosswind with a magnitude as your
> airspeed let you fly toward the clouds at a 45 degree angle. My setup was:
> Wind from 1...@100, flying heading 270 with 100KTS. The clouds came in from
> 45degrees out of the right hand side.
>
> Torsten
That's just a missing feature/bug in the 3d clouds, and I don't think
it's related
to the particles problem. I haven't managed to find the time to fix
it, and I'm unlikely
to in the near future (baby due end of August), so if anyone is
looking for some work...
-Stuart
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--
Curtis Olson: http://baron.flightgear.org/~curt/
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