[Opensim-users] Several problem on scripting and physics

[Justin Clark-Casey]

On 12/08/10 23:50, Tzu-Lun Wong wrote:
> Hey, thanks for the reply.
> 1) No, it doesn't treat the avatar as phantom and it will interact with
> *some* physical object just fine (when they're fine, they don't tend
> have the problem any more).
>
> Sorry, but I'm relatively new to OpenSim, I'm not sure what you meant by
> "git Master code" but I encountered this problem using 0.6.9 and
> recently just changed to 0.7.1 and still encountering this problem. I've
> looked into the ODE section under OpenSim.ini but found nothing really
> useful in there.

No problem - I just meant the latest cutting edge code in our source repository (which is git).  But 0.7.0.1 is very 
recent, so it's very similar to what is in Master.

>
> 2) I have played around on 0.7.1 and this problem don't seen to be
> occurring any more. I have everything set as default when using 0.6.9
> however.

Curious, I haven't heard of this particular problem with the 0.6.9 packages.

>
> 3) Interesting. I am currently using OpenSim under windows, and the page
> don't seen to have much details on using ODE 11.1. I will give it a try
> though, but any extra help would be appreciated!

Be aware that if you're using the 64 bit version of Windows, it's better so start OpenSim in 32 bit mode (using 
OpenSim.32BitLaunch.exe).  There have been problems compiling a 64 bit version of ODE for Windows, so we can only ship 
32 bit libraries.

>
> Thanks again!
>
> On 13 August 2010 09:42, Justin Clark-Casey <jjustincc at googlemail.com
> <mailto:jjustincc at googlemail.com>> wrote:
>
>     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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-- 
Justin Clark-Casey (justincc)
http://justincc.org
http://twitter.com/justincc