[X3D-Public] XMPP or not XMPP

[Christoph Valentin]

Hi Sven-Erik

Don't know much about simulation engines, but maybe can contribute "my two 
cent".

>  The intention are to use the same script for  all transfere of states 
over the network or only local in the  mashine. 

If you use TCP/IP for transmission, and if you assume an IP stack always 
being present, you can delegate the "local/remote" decision to the IP 
stack. Use "localhost"/127.0.0.1 as destination address and the "short cut" 
will be done by the IP stack (saving development effort on the cost of some 
additional computational overhead, keeping scripts simple).
I had a similar problem in the "SrrTrains" project, where I rely on the 
"EventStreamSensor" / "NetworkSensor" and I aimed to support 
single-player-mode without(!) collaboration server. Unfortunately, 
"EventStreamSensor"/"NetworkSensor" don't support "single-player-mode 
without collaboration server", but only "single-player-mode with 
collaboration server" (which is nothing else than a multi-player session, 
that hosts only one user accidentally). I had to implement some if()s to 
bypass "EventStreamSensor"/"NetworkSensor" in case of single-player-mode.

> Primarily I'v taken the example to have a MU 3D space with many 3D  
clients and one or more servers.         Secondly one computer hosting both 
a 3D Browser and a  simulation/animation engine.        
So you have an m:n relationship between clients and servers. I assume, that 
servers will not be added or removed frequently, unless you add or remove 
models dynamically.

Starting up and terminating clients will change the communication relations 
on the other hand, you will have to update all servers to tell them, to 
which addresses the states will have to be distributed.

What about having a dispatcher in between, such that you have:
     m clients     ---     1 dispatcher     ---     n 
servers

Kind regards
Christoph

>         
> -------- Original-Nachricht --------
> Datum: Thu, 2 Sep 2010 04:53:26 -0700 (PDT)
> Von: Tom Sparks <tom_a_sparks at yahoo.com.au>
> An: 'Christoph Valentin' <christoph.valentin at gmx.at>, Sven-Erik Tiberg 
> <Sven-Erik.Tiberg at ltu.se>
> CC: "x3d-public at web3d.org" <x3d-public at web3d.org>
> Betreff: Re: [X3D-Public] XMPP or not XMPP
> 
>         
>                                                 --- On Thu, 2/9/10, 
> Sven-Erik Tiberg <Sven-Erik.Tiberg at ltu.se> wrote:
> 
> >  
> > From: Sven-Erik Tiberg <Sven-Erik.Tiberg at ltu.se>
> > Subject: Re: [X3D-Public] XMPP or not XMPP
> > To: "'Christoph Valentin'" <christoph.valentin at gmx.at>
> > Cc: "x3d-public at web3d.org" <x3d-public at web3d.org>
> > Received: Thursday, 2 September, 2010, 9:28 PM
> > 
> >                                         
> >                                          Hi Christioph                  
> >                         The intention are to use the same script for  
> > all transfere of states over the network or only local in the  
> > mashine.                    If local the script would transfere states 
> > between a  X3Dbrowser and a simulation/animation engine on the same  
> > computer.                    If MU the script will transfer states 
> > over the  network to either another or many X3Dbrowser or / and one or 
> > more  simulation/animation engine on one or many servers.               
> >                           Primarily I'v taken the example to have a MU 
> > 3D space with many 3D  clients and one or more servers.                 
> >     Secondly one computer hosting both a 3D Browser and a  
> > simulation/animation engine.                                          
> > If  it's possible to use js or ajax as a network extension to any 3D 
> > Browser I will  get a cace and celibrate with my collegues.             
> >        A dinner when we got the MU running and guess what  when we got 
> > a MU with simulation engines runing. :)                                
> >           /Sven-Erik                                         
>                                          there is a catch in 
> simulation/animation engine that are server side
> you'll need to use something like Discrete Event Simulation 
> (http://www.cs.brown.edu/~scd/world/sim.html)
> 
> tom
>                                                           
>                             
>            
    
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