[Opensim-users] objects undergoing continuous change

[Dr Scofield]

Frisby, Adam wrote:
> I would like to be easier to integrate and edit region modules using our
> OpenSim API.
> 
>  
> 
> Exposing some of that functionality to user scripting (but obviously
> under controlled environments) and being able to recompile and run new
> modules on the fly would be a very cool feature to have.

python region modules...

	cheers
	dr scofield

> 
>  
> 
> Adam
> 
>  
> 
> *From:* opensim-users-bounces at lists.berlios.de
> [mailto:opensim-users-bounces at lists.berlios.de] *On Behalf Of *Diva Canto
> *Sent:* Wednesday, 12 November 2008 7:58 AM
> *To:* opensim-users at lists.berlios.de
> *Subject:* Re: [Opensim-users] objects undergoing continuous change
> 
>  
> 
> I have written a region module that does traffic simulation. Here's a
> video produced by my students:
> http://uk.youtube.com/watch?v=kJNDcurLP1w
> 
> That was back in late August; the opensim API has changed considerably
> since then and I haven't had time to update my module yet. I didn't use
> physics; it was all done with periodic updates to the objects' state,
> just like in traditional simulation. It works pretty well, only starting
> to break when there are more than 2 avatars in scene; the breakage is
> because we have the server behind a home DSL, so packets start getting lost.
> 
> In general, for doing tradional simulations forget about using inworld
> scripting. Even if the scripting engine was already working well, which
> is not, that introduces a lot of unnecessary overhead. Moreover, it also
> imposes a programming model that is an obstacle to simulations (for
> example, not being able to hold references to objects and having to
> interact with them via llSay functions). The opensim API, on the other
> hand, is a joy to work with (how many times have I said this? :-)
> 
> Diva / Crista
> 
> Paul Fishwick wrote:
> 
> Justin Clark-Casey wrote:
> 
>   
> 
>     Yes, things are stored in memory with a regular flush to database that occurs every 15 seconds.  However, I suspect that 
> 
>     objects with the physics attribute are not currently persisted (from a recent thread on opensim-dev).
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> I am curious as to whether it could become possible (in a standalone 
> 
> server or
> 
> in a grid with only one person) to do continuous visual updates for moving
> 
> objects (physical or otherwise). I have tried a few experiments, such as a
> 
> continuously moving block using LSL (setpos) and after a few seconds, the
> 
> behavior becomes erratic (for example, the box shoots off somewhere or
> 
> disappears entirely from the region).
> 
>  
> 
> I realize that having fast moving visual objects does not lend itself 
> 
> well to sharing
> 
> state, but there are some instances where one wishes to simply launch a 
> 
> region
> 
> or grid and do more traditional simulation (as one might do in OpenGL) 
> 
> whether
> 
> or not the object states are shared, or on the frequency of sharing. It 
> 
> would be nice
> 
> to have this "standalone continuous object motion" as a switch-based or
> 
> deltatime-specified capability.
> 
>  
> 
> Thoughts?
> 
>  
> 
> -p
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>   
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>          * Would it (or is it) useful to have some scripts run on the client 
> 
>         rather than the
> 
>             server for less server loading? For example, could ODE run on the 
> 
>         client
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>             
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>               
> 
>     I think that some minor stuff is done client side already (such as flexiprims).  However, I suspect one runs into 
> 
>     difficulties when objects can affect each other, since you would have to start communicating all this information back 
> 
>     to the server and somehow synchronizing it with changes from other clients.
> 
>      
> 
>     However, I am not an expert in this area.
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> 
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-- 
dr dirk husemann ---- virtual worlds research ---- ibm zurich research lab
SL: dr scofield ---- drscofield at xyzzyxyzzy.net ---- http://xyzzyxyzzy.net/
RL: hud at zurich.ibm.com - +41 44 724 8573 - http://www.zurich.ibm.com/~hud/