[Opensim-dev] rex auth & avatar systems (Re: future rexviewer merger)

Tue Dec 9 00:43:34 UTC 2008

My understanding of the structure is the Rex system is closer to a decoupled system than the Hypergrid.

Hypergrid involves teleporting along known links - ie you teleport to a hypergrid region which connects you to other regions. The Rex model is closer to a web browser, where you move along via URL-equivilents, and it will disconnect/reconnect you from the current/next sims - sort of ala a more seamless Meerkat.

The Rex auth server basically acts as an identity broker - when you request access to a sim on a different network ("grid"-ish), you get authorised by your auth server. Your auth server acts very similarly to the OGP Agent Domain, in that it is responsible for routing messages to you, assigning sessions, etc.

At risk of using outlook's HTML here, allow me to draw a diagram...

[cid:image001.png at 01C95953.DCA0E7A0][cid:image002.png at 01C95953.DCA0E7A0][cid:image003.png at 01C95953.DCA0E7A0]

        [cid:image004.png at 01C95953.DCA0E7A0]

This diagram shows a user logging into the first sim, then teleporting to a second sim on another network. AuthAlpha.com isn't prescribed anywhere on any sims - they don't know it exists until a user attempts to login, in which case it is contacted and asked to cough up some info about the user.

The rex server operates under two modes here, you can either lock to particular pre-authorised auth servers (the OGP 'internal network' use case - ie, corporate intranets, etc), or you can open up to any avatar on any auth server (public grids, etc).

Regards,

Adam

From: opensim-dev-bounces at lists.berlios.de [mailto:opensim-dev-bounces at lists.berlios.de] On Behalf Of Cristina Videira Lopes
Sent: Monday, 8 December 2008 9:37 AM
To: opensim-dev at lists.berlios.de
Subject: Re: [Opensim-dev] rex auth & avatar systems (Re: future rexviewer merger)

To be precise, the comparison is not really between the hypergrid and Rex's avatar server; it's about comparing Rex's avatar server with OpenSim's User+Asset+Inventory trio.
The hypergrid is simply adding the capability of region servers interacting with several of those trios instead of just one.

So, the unclear spot, really, is why Rex felt the need to substitute UAI with something else.

Charles Krinke wrote:
I'm sorry. This is an OpenSim discussion channel. So, we are interested in what OpenSim is doing and where we are going.

We have two different teleporting methods in OpenSim already. One is the AWG/OGP which allows teleporting from the LL betagrid to an OpenSim region. The other is the "HyperGrid", which allows teleporting between OpenSim grids or regions.

We certainly can consider a third, and that certainly could be Rex. Or, certain Rex features may be added to the existing two interop technologies we already support.

So, with that in mind, lets move forward and discuss the technical details of how the Rex technology works and how some or all of it is appropriate to add to OpenSim.

Charles

________________________________
From: Lc <lcc1967 at gmail.com><mailto:lcc1967 at gmail.com>
To: opensim-dev at lists.berlios.de<mailto:opensim-dev at lists.berlios.de>
Sent: Monday, December 8, 2008 9:11:05 AM
Subject: Re: [Opensim-dev] rex auth & avatar systems (Re: future rexviewer merger)

"Rex avatar server was out and TPing from SL to a Rex grid was done
before LL made the gridnaughts. The Rex group is ahead of the curve.
It probably will not hard for them to retool and go backwards to be
compatible with others are doing. But you have to remember that Rex
server is really the leader, the others are just following and not
acknowledging the work that has been done already."

Please don't speak in the name of ReX pple particularly when you don't know what you are talking about.

Sm

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