[Opensim-dev] Questions about Vehicle scripting calls

[Melanie]

Hi,

we use a module that is been developed for us as custom work. It
allows running unmodified SL vehicle scripts - well, mostly. We also
have llSetKeyframedMotion() for things that don't really need to be
physical. The latter will be donated to OpenSim at some point.

Melanie

On 06/06/2012 19:41, Bengt Falke wrote:
> Does anybody know what kind of physics Avination use? Physics works better there if I remember correctly?
> Void Pipe
> 
> 6 jun 2012 kl. 19:10 skrev James Hughes:
> 
>> I have been experimenting with trains in SL and would like to make a physical one that works in OpenSim. Hopefully these cases aren't some limitation of the physics engines and can have a proper fix.
>> 
>> -BlueWall
>> 
>> On 06/05/2012 07:46 PM, Mike Higgins wrote:
>>> I was talking to Justin Clark-Casey at the OpenSim developers meeting
>>> this morning, and he suggested that the mailing lists would be the
>>> easiest way to have a conversation about vehicle physics on OpenSim.
>>> Justin you there? Is this where you meant? Anyone else want to talk
>>> about vehicle scripting in OpenSim?
>>> 
>>> I am in the process of testing the OpenSim vehicle scripting calls and
>>> trying to find out what works and what can be worked around. I am
>>> submitting mantis reports when I think I see a true bug, issue numbers
>>> 0006039 <http://opensimulator.org/mantis/view.php?id=6039> and 0006040
>>> <http://opensimulator.org/mantis/view.php?id=6040> for starters. Instead
>>> of submitting 1000 line vehicle scripts that do not work, I am writing
>>> small 10-line scripts that demonstrate a particular problem.
>>> 
>>> Issue 0006040 <http://opensimulator.org/mantis/view.php?id=6040> is
>>> particularly interesting because if my hypothesis is correct, the linear
>>> motor direction is being actively projected onto the global XY plane. I
>>> cannot get an airplane to glide up, or a balloon to rise using the
>>> linear motor. (Hover height works with balloons, but not the linear
>>> motor even with hover height disabled). The interesting thing about this
>>> is that my hypothesis suggests that there is extra code doing this
>>> projection onto the XY plane. I checked the vehicle flags and there
>>> isn't one that should force this extra projection into the calculations.
>>> Vehicle type balloon is supposed to have all the flags removed, but just
>>> to be sure I used the remove call to clear them all. The linear motor
>>> still cannot go up. Can someone familiar with the code look at the
>>> linear motor and tell me why this is happening and if there is a way to
>>> disable it? (I tried turning flags like VEHICLE_FLAG_NO_DEFLECTION_UP on
>>> to see if this flag was inverted, and if it applied to the motor instead
>>> of deflection, but no luck).
>>> 
>>> The fun thing is that I can write one kind of vehicle that works well --
>>> assuming this bug is there. I built a vehicle that has the linear motor
>>> set to <0,0,20>, pointing straight up. When the vehicle is perfectly
>>> horizontal, the projection of this motor onto XY is <0,0,0> and the
>>> vehicle does nothing. But then when you tilt the vehicle in any
>>> direction, the projection of the linear motor on XY becomes non-zero and
>>> causes it to start moving in the direction of tilt. This feels a lot
>>> like an RL helicopter, so I used the control keys to pitch down/up to
>>> move forward/backwards, added yaw left and right, and used page-up/down
>>> to increase/decrease the hover height. I put it in a hacked together
>>> helicopter build and it is a lot of fun!
>>> 
>>> I'm looking for work-arounds for the current vehicle routine behaviors.
>>> One work-around for an airplane is to turn on hover height, check the
>>> airplane speed and pitch once a second in timer(), calculate what
>>> altitude the plane should get to in the next second, and set hover
>>> height to that altitude. The things we do to get stuff working!
>>> 
>>> 
>>> 
>>> 
>>> 
>>> _______________________________________________
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>>> Opensim-dev at lists.berlios.de
>>> https://lists.berlios.de/mailman/listinfo/opensim-dev
>> 
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