On 12/08/10 10:33, Tzu-Lun Wong wrote:
Hi all, I've posted this on the OSgrid technical forum and was
redirected here.
I'm currently working on a project for an University on exploring
opensim as a possibility for a learning environment for physics. I've
encountered several problem on my local opensim region. (NOTE: all
problem below are encountered on the ODE physics engine)
1) Sometimes when object are set physical, it'll treat other object as
"phantom". For example, I've set up a platform (8m x 6m x 0.1m) floating
in mid air, and a lot of the time when I try to place anything physical
on it, the physical object will ignore the platform and fall through it.
I can't seen to find out why as I have tried various shapes and sizes
and the problem isn't consistent, sometime it doesn't fall through
sometime it does.
Does it also treat the avatar as phantom?
Just in case, you might want to try the latest git Master code, since I recently put in a fix that stops non-root prims
being 'phantom' on initial shift-copy in-world duplication (though things are fine after a server restart). I suspect
that this doesn't have anything to do with your problem but it's worth checking.
As a last resort you may want to fiddle with the [ODEPhysicsSettings] section in OpenSim.ini, though I've no real idea
if this will help.
2) When restarting my opensim server/region, all the object's script
disappears. This means I have to save everything into my inventory
before I close down the server and then rez them back and relocate them
EVERY TIME. Is this a known problem or is there a step where I missed
that will save the script before I quit the server?
In prim scripts should be being saved without any extra user actions. I suggest you carefully check your OpenSim
configuration.
3) This one is probably unsolvable unless there's an update on physic
engine. My partner on the same project made a pendulum that pivot on a
triangular shape. When the pendulum reaches it's highest peak on it's
swing, it shakes vigorously. After a long time the pendulum will
eventually shift position. I'm guessing this is due to rounding
calculation on the contact point of the pivot point when it reaches it's
highest peak, causing the pendulum to "shift-slightly" causing it to
"shake".
I suspect you're right, though I'm no physics expert. OpenSim currently uses ODE 10.1. Some folks are experimenting
with ODE 11.1 with good results. I updated the OpenSim wiki at
http://opensimulator.org/wiki/PhysicsEngines
with those instructions (I haven't actually tried this myself).
Regards,
--
Justin Clark-Casey (justincc)
http://justincc.org
http://twitter.com/justincc
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