Category: SL Tech

The following notes were taken from the Tuesday, August 18, 2026 Simulator User Group (SUG) meeting. These notes form a summary of the items discussed, and are not intended to be a full transcript. No video for this meeting – Pantera is on vacation.

Meeting Overview

• The Simulator User Group (also referred to by its older name of Server User Group) exists to provide an opportunity for discussion about simulator technology, bugs, and feature ideas is held every other Tuesday at 12:00 noon, SLT (holidays, etc., allowing), per the Second Life Public Calendar.
• The “Leviathan Office Hour” meetings are held on the Tuesdays which do not have a formal SUG meeting, and are chaired by Leviathan Linden. They are more brainstorming / general discussion sessions.
• Meetings are held in text in-world, at this location.

Simulator Deployments

• No deployments this week, but all simhosts will be restarted.

General Updates

• Rider Linden is focused on the next version of the VSCode plugin (for which he’s asked for anyone willing to help document to contact him)  and a further update to the Lua editor viewer.
• Leviathan Linden has been focused on anti-griefing / crash mitigation work.
• Monty Linden is hoping to get back to his work on EventQueueGet.
• Kyle Linden repeated his call for those wishing to help edit the SL Wiki to contact him.
• Harold Linden (Lua):
  • Is working on migrating most of the Luau-specific interruption and script serialization logic from the closed server repo to the SLua repo.
  • Is also , taking the time to re-engineer things in a way that makes script bytecode-sharing and improving our garbage collection strategy easier.
  • Hopes this work will make individual server releases less bound to particular SLua repo versions by moving the “hairy” parts of the integration to SLua itself, so keeping a nice interface.
  • Those who want to do benchmarking / local running of scripts will find this work “extremely useful since you’ll be able to implement a runtime environment that’s much closer to how your scripts actually run on the server”.
  • Once this work is done, Harold plans to cut a new Lua simulator release.
  • Simulators running the Lua code are still “remarkably stable”.
• Pepper Linden continues to work on some region crossing code, and the hope is to move their work forward as a project simulator, and progressing it through the release mechanism.

General Discussion

• The subject of a scripted means to toggle Animesh objects on/ off and enabling attachments on Animesh objects raised at the previous CCUG meeting was raised here, as requested at that meeting.
  • This included referencing New LSL llAnimeshEnabled(integer enabled); Toggle Animesh Property on/off.
  • Rider Linden indicated he was broadly in favour of the approach – with the caveat that care would have to be taken if how it works due to concerns of object return if enabling one or more Animesh objects via script (thus increasing their Land Impact by around 16) could trigger parcel object return.
  • The suggestion was to have a switch in the function so that if enabling an Animesh object (and thus increasing its LI) which would cause any start-up of an Animesh object to fail if the change in LI risked triggering object return.
• The above triggered a discussion on the additional LI penalty on Animesh and its need & validity, together with the ordering object return.
  • There was some confusion on the subject of attachments – with it initially being mistaken for avatars being able to wear Animesh attachments (which is supported) and the request for Animesh objects supporting their own attachments via their skeletons.
  • The latter was proposed for “Animesh 2.0” (aka Project Muscadene) which also promised body shape and  physics support for Animesh, but this died before fully implemented when attention turned to updating Avatar complexity  / Land Impact calculations – which also subsequently died.
  • The discussion on object return related to exceeding a parcel’s Land Capacity. Currently the last object(s) rezzed will be returned if the limit it exceeded. However, if the limit is broken whilst editing an object (because it crosses between accounting models and it’s LI increases), then there is an argument to say it is the object being edited which should be returned, not the last item(s) rezzed.
  • These discussions continued through most of the rest of the meeting with no firm decisions made.
• Folded into part of this was a question on synchronising inventory on Aditi (the beta grid) and the Main grid. This should be a matter of logging-in to Aditi and then waiting for the next automated synchronising process, run (IIRC) at around 02:00 SLT each day.
• There was also a general discussion on scripting which, given I’m not scripter, I’m not even going to attempt to translate!

Date of Next Meetings

• Leviathan Linden: Tuesday, August 25, 2026.
• Formal SUG meeting: Tuesday, September 1, 2026.

The following notes were taken from the Tuesday, August 11, 2026 Simulator User Group (SUG) off-week meeting (the “Leviathan Office Hour”). These notes form a summary of the items discussed, and are not intended to be a full transcript. They were taken from my chat log of the meeting. No video this week, as Pantera is on vacation.

Meeting Overview

• The Simulator User Group (also referred to by its older name of Server User Group) exists to provide an opportunity for discussion about simulator technology, bugs, and feature ideas is held every other Tuesday at 12:00 noon, SLT (holidays, etc., allowing), per the Second Life Public Calendar.
• The “Leviathan Office Hour” meetings are held on the Tuesdays which do not have a formal SUG meeting, and are chaired by Leviathan Linden. They are more brainstorming / general discussion sessions.
• Meetings are held in text in-world, at this location.

Simulator News

• As noted in my week #32 Simulator User Group meeting notes, the hot fix for some regions failing to grant capabilities correctly to the viewer (and thus crashing it) resulted in issues of its own, and so was rolled-back in week #32.
• This means that while the more recent issues have been reverted, the original capabilities failure issue is again active, and people may find themselves being disconnected from regions and the viewer crashing.
• Until a new fix for this issue can be deployed, if you are impacted by the viewer crash / disconnect issue  and wish to log back into the same region, the advice is to wait a minute or two before attempting a log-in, as this may help.

Game_Control

• There is unlikely to be much new for game_control during week #33, as Leviathan is the simulator on-call engineer, so dealing with general issues are his focus.
• Leviathan noted that whilst game_control does allow an avatar to walk / run, depending on how much the control stick is tilted, however, it doesn’t (yet) have analogue directional input.
• As has been previously noted, PromptFont is being used for the game_control preferences UI.
  • However, as Leviathan has modified a number of the PromptFont glyphs, the work falls outside the license for use under the name “PromptFont”. As a result, LL will need to provide an attribution (and payment) to PromptFont, as will need a name for the viewer implementation.
  • “PunctualFont” was suggested to reflect the improvements Leviathan’s improvements; but this (or something else, and several other suggestions then followed) has yet to be officially agreed upon.
• In the meantime there is potentially more font work to be done with game_control.

Region Crossings

• Pepper Linden is continuing to work on region crossings using Aditi (the Beta grid), apparently with a focus on double region crossings (stated by a user at the meeting, as Pepper was not actually available).
• Leviathan noted that Pepper is working to make incremental improvements to region crossing, but their work is not, as yet, ready for merging into upcoming Main grid simulator code.

Lua Update

• A surprising crash which appeared to be related to Lua and the Interest List was identified, but investigation revealed the issue probably the result of data corruption from a recently fixed Lua bug (the binary that crashed predated the Lua fix).
• As a result of this, the Lua team are checking through Lua crashes to see if there are other issues lurking as a result of recent fixes.

In Brief

• Leviathan noted that a side-impact of his work to optimise script runtimes has resulted in Temp attaching above script danger height now causes scripts to not run, which is under investigation.
  • This issue might fall into the same vector as Objects crossing parcels disappear to sensors, scripts, uuid becomes invalid.
• Due to being on-call, Leviathan hasn’t had time to look at the llGetMapRegionTile(), face-count-mismatch bug, as he had hoped he would be able to.
• However, as the on-call engineer, he has been directly involved in fixing potential exploits and griefing vectors, one of which is related to the use of a crasher within the Blake Sea regions and around some sandboxes.
• There was a discussion about the UDP message template in the viewer potentially missing some messages sent by the simulator resulting in problems. This came as a surprise to Leviathan, and the issues has yet to b confirmed.

Meetings

• Formal SUG meeting: Tuesday, August 18, 2026.
• Leviathan Linden: Tuesday, August 25, 2026.