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Release Notes


Welcome to OpenSimulator, an open-source multi-user 3D virtual environment and metaverse server platform.

As ever, OpenSimulator is a highly complex system. Various usage scenarios (standalone, grid, hypergrid, etc.) in combination with different dependencies (e.g. different versions of mono on Linux/Mac) can sometimes produce unexpected or unstable behaviour.

If you are upgrading from a previous verson of OpenSimulator, then we strongly recommend that you start off with the default configuration files and port over any changes you made to your older version of OpenSimulator.

As this is a wiki page, please feel free to update it with more information about migration or other issues as and when these come to light.

You can download this release of OpenSimulator from http://opensimulator.org/wiki/Download

Known issues

  • Loading scripts from the library section of inventory does not work properly.
  • The non-default Warp3D maptile generator currently leaks memory very badly. We recommend that you only use this once at the beginning of each simulator session.
  • For other bugs please see the OpenSimulator Mantis bug tracker.


OpenSimulator requires:

  • .NET Framework 4 when running under Windows.
  • At least Mono 2.8 when running under Mono (Linux or Mac). However, we recommend using at least Mono 2.10 as Mono 2.8.x has been reported as less stable in some situations when running OpenSimulator. Mono 3 has also been reported as working well with OpenSimulator.

Backwards Compatibility Notices


  • Schema changes in asset store, xasset store, fsasset store, region store, AgentPrefs (new table). Migrations included.


General Robust Server

General Simulator Server


  • No significant changes in this release.


  • Fix detach event not being fired until the next time the object is attached. This allows scripts such as AOs to remove animations when detached. The pause added does not affect other avatars or the scene in general and only pauses the avatar performing the detach for an extra 2 milliseconds.


  • Fixed not being charged to create classifieds on money enabled regions


  • [EntityTransfer]: MaxOutgoingTransferVersion eliminated.
  • New section: [AccessControl]
  • [LL-Functions]: new variable UseLlCastRayV3 = false by default, as well as several new variables related to llCastRay


  • No significant changes in this release.



Instant Messaging


  • Fixed several performance issues regarding initial inventory download by changing the IInventory API. In some cases this has resulted in 10x performance improvement, and much lower CPU spikes during login.




  • No significant changes in this release.


  • No significant changes in this release.



  • ODE Now supports variable-sized regions


  • Bug fix: Change UserProfiles so that the parcel name is used for a ProfilePick and not the parcel owners name. This change also fixes a bug where if the avatar enters and does not move, creating or editing a ProfilePick would set the parcelId as an empty UUID.


Region Cross/Teleport


  • Changes to make the script times shown in the "Top Scripts" window more accurate:
    • Measure script execution time precisely, using a sub-millisecond timer. This is needed because some scripts execute very often, but only run for a very short amount of time in each invocation. Previously such scripts were shown as using 0 time.
    • Use a 30-seconds sliding window for measuring script execution. Previously the window was 30 minutes, and even that didn't work correctly.
    • Ignore the time the script spends sleeping. Many LSL functions have a sleep-delay at the end.
    • Include the XEngine overhead in the timings. Previously it was excluded.
    • For more information, see http://opensimulator.org/wiki/Scripts_Performance
  • When the user stops a script, have it remain stopped even after a region restart. Previously, after a region restart the script would start Running again.
  • New llCastRay implementation. It sets up its own mesh cache and uses libopenmetaverse mesher instead of Meshmerizer. It works fully with sculpts and meshes, eliminates the 40-50% overhead on first encounter with a shape, sculpt or mesh, increases the time save when using cached geometries to about 65% on a high-end server and 75% on an ordinary laptop in some performance tests. To enable it, set UseLlCastRayV3 = true.




  • The simulator now reports the actual physics' frames per second (fps) that is used in OpenSimulator. In normal operation, this number is close to 11. Previously OpenSim reported a multiple of the actual physics fps, so that viewers would get a number similar to that used in Second Life. We no longer do that. We now report the correct physics fps.
  • New metrics reported:
    • Logging in Users: number of users attempting to login
    • GeoPrims: count of all geometric (prim) objects in the scene
    • Mesh: count of all mesh objects in the scene
    • XEngine Thread Count: Number of threads in use as reported by XEngine's SmartThreadPool
    • Util Thread Count: Number of threads in use as reported by Util's SmartThreadPool
    • System Thread Count: Number of threads in use as reported by the Microsoft SDK
    • ProcMem: Physical memory in use by the opensim instance in kB. This includes shared (e.g. system libraries) and private data.



  • No significant changes in this release.



Many, many thanks to all the developers, testers and community members who contributed to this release and who help out with OpenSimulator generally. Your hard work makes this all possible.

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