ModRex

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Contents

Overview

ModRex is a joint effort between RealXtend and OpenSim developers to make it possible to join the RealXtend viewer to the OpenSim codebase. The RealXtend viewer is based on the opens source OGRE game engine and differs from the Linden Lab viewer in several ways. The most distinct difference is in the new rendering potential offered by OGRE. When using RealXtend as a viewer for OpenSim, one obtains real-time shadows, improved lighting simulation, and more importantly, the OGRE mesh. The mesh is hierarchical (multiple meshes and sub-meshes) and can include a skeleton for defining avatar motion and dynamics.

ModRex is important to the OpenSim community mainly because, like the base opensim code base itself, the RealXtend viewer is open source and breaks away from some of the key contraints imposed by the LLviewer, such as inability to create meshes, shadows, realistic avatars, and advanced lighting effects. ModRex while not part of the viewer, is the glue that connects the viewer to the opensim trunk code.

Here is an image built from using Opensim+ModReX
ModRex with mesh support, running on Linux
and a movie to illustrate some of the mesh and lighting effects in the viewer:

To use ModRex, you need the following: (1) The RealXtend viewer, (2) ModRex, and (3) OpenSim. The viewer (1) is downloaded from here. Make sure to download the latest viewer and any patches that have been added since that viewer version. They should be located on in the sourceforge page. For Windows, the viewer is run directly as an .exe, and for Linux, wine is used to launch the viewer. OpenSim (3) is compiled as instructed elsewhere in this wiki (Get OpenSim and Building). The setup for ModRex is documented below for Windows and Linux.





Key areas on the web where modrex and RealXtend functionality is documented:

Setup

Windows

The following procedure is used to set up modrex:

  • Download and build the latest version of opensim. To differentiate it from other opensim builds that you may have, call it opensim_modrex, for example. Then, you will remember that this build requires the RealXtend viewer. We'll assume you have your opensim implementation stored in C:\opensim_modrex.
  • Prebuild (i.e., running Prebuild2008) and compile as you would do normally just to make sure that this build of opensim is executing. Start up opensim and make sure that you can view the region using the LLviewer.
  • Create a new folder such as C:\modrex, and then get the latest version of modrex into this folder. Modrex is obtained using a version of svn, such as TortoiseSVN. The checkout URL is http://forge.opensimulator.org/svn/modrex. You will need to enter "anonymous" when asked to check out modrex. Make note of the revision of modrex after all files have been downloaded, just for reference in case you encounter difficulties and need to report a concern or bug.
  • Copy the folders located in C:\modrex\trunk to C:\opensim_modrex\opensim
  • Run the prebuild (if using VC # 2005) or prebuild2008 (if using VC# 2008) that is now located under C:\opensim_modrex\opensim\ModularRex.
  • Go to your c:\opensim_modrex\bin, launch VC# on the OpenSim solution, and enter 3 projects to the existing OpenSim solution (right-mouse click on the solution name, Add->Existing Project): ModularRex (found in C:\opensim_modrex\opensim\ModularRex), ModularRex.Nhibernate (found in C:\opensim_modrex\opensim\Nhibernate), and ModularRex.RexFramework (found in C:\opensim_modrex\opensim\RexFramework).
  • Re-build the opensim solution. There should not be any errors. This, in turn, will add new region modules specially for the RealXtend viewer/OpenSim connection inside of C:\opensim_modrex\bin.
  • Inside of c:\opensim_region\bin\OpenSim.ini, add the following section: 
[realXtend]
db_connectionstring = "SQLiteDialect;SQLite20Driver;Data Source=RexObjects.db;Version=3"
  • We are almost ready to run the viewer, except that the current incarnation of modrex requires authentication and avatar storage to be run separately in addition to opensim). Therefore, the way to run modrex, is to (1) Start the Authentication server, (2) Start the Avatar Storage server, and finally to (3) run opensim. The server is located in the general web page as the client viewer here. The authentication server and avatar storage servers are .exe files located in the primary

server download. Do not run the server, only Authentication and Avatar Storage. Use the Authentication window to add new users as required.

  • Launch opensim.exe. This will now run opensim, access the new Modrex region modules inside of C:\opensim_modrex\bin, and start up your opensim server.
  • Launch the RealXtend viewer and enter your username, password, and connection. Your username, in contrast to Opensim user names, will be one string such as "testuser". If the domain of your server is myserver.com, then you log in as "testuser@myserver.com" entered in the "User Name" field. Enter the password. For "Connect To:", enter your server: myserver.com. Then, press "Connect" in the viewer.
  • You should be inside of your opensim world but using the RealXtend viewer. Caveats and Bugs are located below.


Linux

mkdir /opt/opensim opt/opensim/simulator /opt/opensim/authentication /opt/opensim/avatarstorage /opt/opensim/builds
cd /opt/opensim/builds/8218
svn co http://opensimulator.org/svn/opensim/trunk . 
sh runprebuild.sh
nant
mkdir modrex modrex/build
cp -R bin/*.dll modrex/build
cd modrex
svn checkout http://forge.opensimulator.org/svn/modrex/trunk .
cd ModularRex
vi prebuild.xml
  • Change each ../../../bin to ../../build, and each ../../bin to ../build, save and exit 
mono ../../bin/Prebuild.exe /target monodev
  • Open /opt/opensim/builds/8218/OpenSim.sln with MonoDevelop
  • Add existing project > modrex/ModularRex/RexFramework/ModularRex.RexFramework.mdp
  • Add existing project > modrex/ModularRex/NHibernate/ModularRex.NHibernate.mdp
  • Add existing project > modrex/ModularRex/RexOdePlugin/ModularRex.RexOdePlugin.mdp
  • Add existing project > modrex/ModularRex/ModularRex.mdp
  • Change the runtime version for these projects to mono 3.5
  • Replace the broken OpenSim reference in the ModularRex project with the equally named OpenSim project
  • Replace the broken OpenSim.Region.Physics.Meshing and OpenSim.Region.Physics.OdePlugin references in the RexOdePlugin project with the equally named OpenSim projects
  • Build the modularRex projects. If no errors occured, The dll's are stored in /opt/opensim/builds/8218/modrex/build 
cp /opt/opensim/builds/8218/modrex/build/ModularRex.* /opt/opensim/builds/8218/bin
  • Copy python-engine dependencies 
 cp -R /opt/opensim/builds/8218/modrex/ModularRex/RexParts/RexPython/Resources/* /opt/opensim/builds/8218/bin/ScriptEngines
cd /opt/opensim/builds/8218/bin
cp OpenSim.ini.example OpenSim.ini
  • edit OpenSim.ini, and add this: 
;This goes under [startup]
rex_python = true
[realXtend]
enabled = true
db_connectionstring = "MySQLDialect;MySqlDataDriver;Data Source=localhost;Database=opensim;User ID=root;Password=mypw;"
  • Copy the modrex enabled OpenSimulator to the production dir 
cp -R /opt/opensim/builds/8218/* /opt/opensim/simulator
  • Add the rex mysql tables to the opensim database
  • Download and build the authentication service 
svn co https://realxtendserver.svn.sourceforge.net/svnroot/realxtendserver/authentication/tags/0.4 /opt/opensim/authentication
cd /opt/opensim/authentication
mono bin/Prebuild.exe /target nant
nant
  • Create a mysql database "authentication" 
cd bin
mono Authentication.exe
  • Setup authentication 
MySql_SqlHandler.dll (or SQLite_SqlHandler.dll. MySql_SqlHandler.dll gives not implemented messages but seems to work ok)
<enter>(AuthenticationEngine=AuthenticationEngine.dll)
<enter>(logging enabled=False)
<enter>(def. region x 1000)
<enter>(def. region y 1000)
<enter>(avatarstorageurl 172.16.1.65:10000)
<enter>(default gridurl 172.16.1.65:9000)
<enter>(default dns)
<enter>(dbserver 127.0.0.1)
<enter>(dbname authentication)
<enter>(dbuser root)
*******(dbpw for root)
172.16.1.65 (httpsettings LAN-IP)

The authentication daemon should run by now

  • Create a user in the authentication screenconsole 
create user
  • Download and build the avatarstorage service 
svn co https://realxtendserver.svn.sourceforge.net/svnroot/realxtendserver/avatarstorage/tags/0.4 /opt/opensim/avatarstorage
cd /opt/opensim/avatarstorage
bin/Prebuild.exe /target nant
nant
  • Create a database "avatarstorage" 
cd bin
mono AvatarStorage.exe
  • Setup avatarstorage 
MySql_SqlHandler.dll
<enter>(AuthenticationEngine.dll)
<enter>(Inventory True)
<enter>(PersonalInventoryService.dll)
PersonalInventory.SQLITE.dll
<enter>(logging_enabled False)
<enter>(dbserver 127.0.0.1)
avatarstorage (dbname)
<enter>(dbuser root)
********(dbpw root)
172.16.1.65 (httpsettings LAN-IP)
<enter>(http port 10000)
<enter>(ssl False)

The avatarstorage daemon should run by now

  • You can use this rex serverscript to manage and start the services(uses screen)

Most important screen-commands are: 

screen -list (shows screen sessions)
screen -r screenname (attaches to the screensession)
ctrl-a + d (detaches from the screensession)

the 'Account' part is the first part in your rex-username(account@myauthenticationdaemonuri)

  • Check in the Simulator console if everything started the way it's supposed to

Once the three services are running, an initial user was made, fire up the realXtend client from wine and login with your credentials.

Known Quirks

  • Important: only one region is currently supported. If your opensim has more

than one region, the viewer will not function

  • Shift-copy a mesh leaves a prim behind
  • Avatar is stored, but appearance changes only after viewer restart
  • Inter-mesh collisions not yet implemented, although avatar w/ primitive collisions work
  • Scripts must be entered into Inventory and copied to the prim. In-world editing in the prim's contents doesn't save script.

Recent Fixes

  • NHibernate-db supports mysql, sqlite and mssql2005. Meshes are persistant
  • Mesh collisions with primitives work
  • Python scripting works
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