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Technical Reference -> Terms -> Developer Documentation

Source Code Repository Access

OpenSimulator uses git as its source code repository.

• Anonymous Checkout

git clone git://opensimulator.org/git/opensim

• Developer Checkout

git clone ssh://USERNAME@opensimulator.org/var/git/opensim

You can also browse the source code for OpenSim using a web browser.

Developer Documentation

General

• Development Team — OpenSim is brought to you by...
• OpenSim: Introduction and Definitions — A work in progress describing the high level components of OpenSim
• OpenSim: Technical Reference — A technical description of the simulator operation.
• Grid Architecture Diagram
• The OpenSim API

Development

• Source Code Repository
• Release Cycle
• Automated Release Building
• On revisions, tags and branches
• Hacking OpenSim for fun and profit — A starters guide for programming OpenSim.
• Coding standards — Coding conventions for developers.
• Automated Testing — How to write tests for OpenSim.
• Debugging Unit Tests — How to debug the automated tests.
• Branches — An overview of the repository branches and what they are for.
• Monodevelop — How to use the monodevelop IDE for editing C# solutions.
• Creating New Solution — How to create new solution according to OpenSim conventions.
• Improving Performance — Efforts to increase OpenSim's performance.

Services

• Mantis Bug Tracking — Mantis is the issue tracking tool of OpenSimulator.
• Panda Building — Panda builds the source base continuously and runs unit tests.
• OpenSimulator GForge — Project hosting for OpenSimulator related projects.

Client Stacks

• Sim Throttles — Information on how OpenSim handles throttling of packets to the client.

Database

• Database Documentation — A map of grid and region instances used in OpenSim
• MonoSqlite — How the database model currently works.
• LSL:PrimitiveParams — Notes on converting SL Edit GUI values and LSL PrimitiveParams to OpenSim PrimitiveBaseShape fields
• NHibernate Performance Testing — SQLite and MySQL performance tests with NHibernate.

File formats

• Technical_Reference/OpenSim_Archive_Region_Format - Opensim Region Archive (OAR) file format.
• Inventory_Archives - OpenSim Inventory Archive (IAR) file format

Grid

• Asset Server problems - list of known problems with the asset server
• Teleports - some diagrams about OGP and Hypergrid teleport sequences
• Agent Domain / Service - Details about the GridForge hosted Agent Domain/Service code

Web Integration

• Webinterface — How to mashup with the web.
• RemoteAdmin — How to use the remote admin plug-in.
• RestConsole - Description how to use the REST remote console
• REST — Information about the REST interface to assets, inventory, etc.
• Known Web Interfaces within OpenSim — The set of CAPS, XMLRPC, or REST entry points in the project.

Modules

• RegionModules — The various modules that are used in the RegionServer and how to write new ones.
• How to create a dynamic plugin - A tutorial for using PluginLoader
• Getting Started with Region Modules - This brief tutorial is intended to get people started with developing applications with/for opensim using region modules and the opensim API.
• Web Statistics Module - The web statistics module documentation and counter wish list.

Permissions

• OpenSim:Permissions(Server) — Permissions system as implemented on the region server.
• OpenSim: Permissions — Notes on how object permissions are handled on the client.

Physics

• PhysicsEngines — Options for physics engines in OpenSim.
• Physics Engine Interface — what methods and such exist in a Physics module

Protocols

• Metaverse Exchange Protocol — MXP is alternative protocol for secondlife protocol.

Regions

• Overview of How Regions Work - notes from ter_afk to rknop in #opensim-dev, cleaned up a bit
• OpenSim: Permissions — Notes on object permissions & definition of the ObjectFlags variable.
• OpenSim Load Balancing and Region Splitting - Instructions for using load balancing and region splitting features.

Threading

• OpenSim: Threading strategy — How threading is implemented and handled.

Scripting

• Scripting_Documentation — How to use scripts and what limitations apply.
• LSL Implemented — A list of LSL-functions that are available in OpenSim.
• OSSL — Some information about the OpenSimulator Scripting Language, and how to implement an OSSL function
• OpenSim.Region.ScriptEngine — How the ScriptEngine looks internally.

Search

• OpenSim.Region.DataSnapshot - Shiny new data gathering/search system
• ImageService - Shiny new region module for serving search-related images

Testing

• Automated_Testing — Writing Automated tests for OpenSim.
• Debugging Unit Tests — Debugging unit tests.
• OpenSim: Debugging - profiler dumps — Dumps of OpenSim profiles to aid in tracking memory leaks.
• Prim_Linking_Testing — Test cases for in world link/unlinking of prims.

Proposals

• Opensim: 0.5 Release Target Discussion
• Opensim: 0.6 Release Target Discussion
• Opensim: Future Release Discussion

• A better SimCrossing - A work in progress about implementing a smooth simcrossing
• OpenID - Proposal for using OpenID in OpenSim
• AssetServerProposal - Proposal for a distributed asset server
• Creating profiles not used for login - RFC for alternative ways of creating profiles that will never be used for login
• OpenSim_Services_and_Service_Connectors - new infrastructure for connecting region simulators to backend services
• OpenSim Profile Anchors - a mechanism for retaining creator information for offline item transfers
• Explicit Object Serialization - a proposal to explicitly serialize scene objects rather than using automatic .NET XML serialization

Proposed projects

• OpenWiredux: Taking the next step
• Using SNMP in OpenSim

Communication

A good first point of contact is the OpenSim IRC, on irc.freenode.net channels #opensim / #opensim-dev. The OpenSim developers hold office hours once a week in-world on Tuesdays at "Wright Plaza" on OSGrid. There is a "Test Hour" on Saturdays, also generally on "Wright Plaza". Both these weekly events are held at 1900UTC. Check on the #opensim IRC channel on Freenode just before each of these events if there is any confusion.

There is also a mailman email distribution list available at https://lists.berlios.de/mailman/listinfo/opensim-dev

Submitting Patches

Please review Submitting_code_to_OpenSim

Recent Git Commits

update libomv fixing a silly typo (UbitUmarov) (Wed, 13 May 2026 19:12:09 -0700)

update libomv fixing a silly typo UbitUmarov <ajlduarte at sapo dot pt> bin/OpenMetaverse.Rendering.Meshmerizer.dll

update libomv (changes to bin serialized used on lludp, etc) (UbitUmarov) (Wed, 13 May 2026 18:53:22 -0700)

update libomv (changes to bin serialized used on lludp, etc) UbitUmarov <ajlduarte at sapo dot pt> .../Region/ClientStack/Linden/UDP/LLClientView.cs

cosmetics on groups (UbitUmarov) (Mon, 11 May 2026 21:40:33 -0700)

cosmetics on groups UbitUmarov <ajlduarte at sapo dot pt> .../Groups/Hypergrid/GroupsServiceHGConnector.cs

add cosmetics on AgentTransactionModule (UbitUmarov) (Mon, 11 May 2026 20:22:34 -0700)

add cosmetics on AgentTransactionModule UbitUmarov <ajlduarte at sapo dot pt> .../AssetTransaction/AssetTransactionModule.cs

add Util.GetFirstConfigVarFromSections<T>(..) While GetConfigVarFromSections<T> scans all sections and returns the last value found, this returns as soon a value is found. So sections should be order from high priority to lower (UbitUmarov) (Mon, 11 May 2026 19:18:26 -0700)

add Util.GetFirstConfigVarFromSections<T>(..) While GetConfigVarFromSections<T> scans all sections and returns the last value found, this returns as soon a value is found. So sections should be order from high priority to lower UbitUmarov <ajlduarte at sapo dot pt> OpenSim/Framework/Util.cs

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