Am 21.07.10 17:15, schrieb Curtis Olson:
On Wed, Jul 21, 2010 at 9:26 AM, Curtis Olson wrote:
Hi Vivian,
Thanks for checking out the submodels. Your image illustrates the
problem really well.
It sounds like this could very well be an issue in translating
coordinate frames, or possibly it's a kts. to mps conversion
issue? I guess I need to go hunt around and see if I can find
where this is in the code.
Just to follow up my own message here. I setup the Rascal 110 which
flies slow and can emit smoke. I set the weather for "stormy monday"
which puts the wind at 70 kts.
What I am observing is that the smoke particles are flowing directly
north. There doesn't seem to be any east component to the smoke
particle movement? That's strange because I've verified that the wind
velocity vector is being computed correctly and sent to the particle
system.
There is an #ifdef in particle.cxx ... #ifdef OSG_PARTICLE_FIX, I
wonder if that's somehow related. It get's defined #if SG_OSG_VERSION
>= 27004 earlier in particles.cxx
Hmmm, could we be dealing with some sort of OSG bug? Or some
difference in behavior between OSG versions? The OSG_PARTICLE_FIX
code is substantially more complicated than without, but the way the
#ifdef structure is setup, it implies that OSG particles were *broken*
in v2.7.4 and the fix applies to any versions after that? Is that the
case???
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
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