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GroundVehicles and Altitude

jdberg

jdberg

Messages
544
Country
germany
Perhaps more of you have the problem, that the SimObjects are not fixed on the ground when you use Category GroundVehicle. With Category Viewer the problem does not occur but this has the disadvantage, that not all effects are shown correct like winddirection changes.

So I made several tests and found (hopefully) a solution, I want to share.
In the sim.cfg of the SimObjects with Category GroundVehicle add the following lines at the end of the file.
[contact_points]
wheel_radius=0.0
static_pitch=0.0 //degrees, pitch when at rest on the ground (+=Up, -=Dn)
static_cg_height=0.0 //feet, altitude of CG when at rest on the ground

The problem seems to be fixed :)
 
Hi,

I am definitely going to try this out because I have always been under the impression that with a 0 static cg_height vehicles go berserk!
Besides, not all sim.cfg vehicles have their model centered and/or at x=0, y=0, z=0 !
Do they not sink in the ground then?

Roby
 
Hi Roby,
please try and report. I do many many tests at the moment with SODE and my objects.
Every input is welcome here. At least for me it works so far with the objects I designed. But all of them have their reference point at 0,0,0

Jörg
 
Hi JD,

Sorry, I overlooked your request to report back.
Yes it works also at 0 cg for sim.cfg's. It does not work correctly for AI vehicles with aircraft.cfg
But if you put them at 0 cg height, what do you do with the wheel diameter?
 
Hi Robystar,
thanks for the report. In the meantime I changed my strategy again and use the Category=viewer mode instead of GroundVehicle.
With the windsock I had to change the wind direction behaviour to the SODE mechanism and delete the rotation in my MDL-file.
This gives me a more stable configuration in the end. For the windsock it seems to be perfect now, with the PAPI it is another story.

To your question about the wheel diameter, this was only the configuration which worked for me in the first tests. I made no more investigations because with Viewer the parameters doesn´t matter.
Jörg
 
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