Category: SL Tech

The following notes were taken from the Tuesday, June 24th, 2025 Simulator User Group (SUG) meeting. They form a summary of the items discussed, and are not intended to be a full transcript. The notes were taken from my chat log of the meeting. No video this week.

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.
• These meetings are conducted (as a rule):
  • Every Tuesday at 12:00 noon SLT.
  • In text (no Voice).
  • At this location.
• Meetings are open to anyone with a concern / interest in the above topics, and form one of a series of regular / semi-regular User Group meetings conducted by Linden Lab.
• Dates and times of all current meetings can be found on the Second Life Public Calendar, and descriptions of meetings are defined on the SL wiki.

Simulator Deployments

• There are no planned deployments to any channels this week, only restarts (RC channels subject to confirmation at the time of the meeting).
• The back-end work which had stalled simulator updates over the last few weeks is now coming to an end.

SL Viewer Updates

• Default viewer 7.1.15.15596336374 promoted June 12 – No Change.
• Second Life Project glTF Mesh Import, version 7.1.14.15361077240 June 2 – No Change.
• Second Life Project Lua Editor Alpha (Aditi only), version 7.1.12.14888088240, May 13 –  No Change.

In Brief

• The subject of holding the meeting every other week was raised again, somewhat supported by those who have only been attending since the simulator release cycle had been put on hold. The majority still favoured a weekly meeting, with the chair possibly rotated between those Lindens who regularly attend.
• Leviathan Linden:
  • His work to try to fix the “sometimes not all content shows up at login” problem is awaiting review. If it passes, it could be in the next simulator update (Fig Newton / Fig Pudding – whichever name is now en vogue).
  • Has an idea as to what might be causing missing content on sim crossing and inter-sim TPs, but needs time to dig into it and try to come up with a solution.
  • Also hopes to finish working on a slight speed-up of the code that generates full object updates so that SLua scripts don’t seem slow when processing such updates.
  • Further noted that reports that the new version of Firestorm causing the server to suffer low FPS (45 → 35) for 1 – 4 seconds, every 60 or 90 seconds when driving a vehicle might also be related to object update issues, although he has yet to carry out a detailed investigation to determine a) if it is real; b) what might be causing it.
• Monty Linden:
  • Has been tracking down the cause of the issue of corrupted Linden grass on and simulator restart (see this report as a reference).
  • Is doing some maintenance work on the Key Value Pair (KVP) store (associated with Second Life Experiences), but noted there are currently no plans for more in-depth work on the KVP store at present, although some plans are being considered.
  • Responding to
  • Allow llHTTPRequest to request application/x-ndjson, noted it would have to be reviewed and that LL’s  http library insists on interpreting response bodies even though it shouldn’t (e.g. can’t do ‘Range’ if a fragment of json or other structured language is to be returned).
• A request was made for a native HTTP library for SLua, with Leviathan Linden noted there would probably be no special path for SLua http; rather, the plan is for any custom script callback operations to be uniform across the various script engines.
• A further discussion on issues of people being being able to select non-owned vehicles / having a scripted ability to report when someone else touches a person’s vehicle / attempt to interfere with vehicles.
• A further discussion on SLua capabilities, with a comment from Leviathan Linden that Rider Linden (on vacation) and Harold Linden (not available for the meeting) would likely be better placed to answer in detail.

† The header images included in these summaries are not intended to represent anything discussed at the meetings; they are simply here to avoid a repeated image of a rooftop of people every week. They are taken from my list of region visits, with a link to the post for those interested.

The following notes were taken from the Tuesday, June 17th, 2025 Simulator User Group (SUG) meeting. They form a summary of the items discussed, and are not intended to be a full transcript. The notes were taken from my chat log of the meeting. No video this week.

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.
• These meetings are conducted (as a rule):
  • Every Tuesday at 12:00 noon SLT.
  • In text (no Voice).
  • At this location.
• Meetings are open to anyone with a concern / interest in the above topics, and form one of a series of regular / semi-regular User Group meetings conducted by Linden Lab.
• Dates and times of all current meetings can be found on the Second Life Public Calendar, and descriptions of meetings are defined on the SL wiki.

Simulator Deployments

• There are no planned deployments to any channels this week, only restarts.
• The stall in simulators releases should be ending soon. It has largely been the result of:
  • Mainly a back-end move from one cloud asset store to another.
  • Coupled with continuing work on setting up github actions to build, store, deploy the various bits and pieces that run the SL backend services.

SL Viewer Updates

• Official Viewer: 2025.04 – 7.1.14.15192634334, issued May 25, promoted May 28 – No Change.
• Second Life Project glTF Mesh Import, version 7.1.14.15361077240 June 2 – No Change.
• Second Life Project Lua Editor Alpha (Aditi only), version 7.1.12.14888088240, May 13 –  No Change.

In Brief

• Rider Linden raised the idea of shifting the Simulator User Group meeting to once every two weeks.
  • This was considered fine *if* there were not a lot going on – and with the exception of last few weeks and the end-of-year slow-down, this generally isn’t the case.
  • Most of those at the meeting expressed a desire to keep it on a weekly basis, with one suggestion that if there is not a lot to discuss during any given meeting, it is brought to a close early, rather than always trying to spin it out to an hour.
  • Another suggestion  – from Leviathan Linden – would be to keep the meeting to once a week, but alternate the Linden chairing it (so not always Rider Linden).
• Questions on Introducing Opacity Control for BOM Layers and Mesh with same material applied to two or more faces but in different slots fail in interesting manner met with pretty much the same response: the ongoing back-end work and updates has more-or-less presented any significant updates involving the simulator.
  • Pepper Linden did indicate there is a desire within LL to do ore with Bakes On Mesh (e.g. PBR support).
• llGetRegionWorldMapTile is tracked, but currently not on the roadmap for implementation.
• A discussion on a Canny requesting the ability to trigger animations by UUID: how  / good bad the idea might be; the need to respect content rights (e.g. the The animation asset and the actively playing animation needing separate UUIDs).
  • No conclusions were drawn at the meeting.
• The above got folded into a discussion on increasing regions sizes, based on this idea, and on a further discussion on UUIDs as a means of storing outfits to “save links” in inventory, uses for “wardrobe2 systems such as CTS, etc.
• LSL functions to adjust parcel settings was raised and received positive responses from meeting attendees & Lindens (with a due discission on permissions and preventing idiots maliciously using scripts to bugger with other people’s land.

† The header images included in these summaries are not intended to represent anything discussed at the meetings; they are simply here to avoid a repeated image of a rooftop of people every week. They are taken from my list of region visits, with a link to the post for those interested.

The following notes were taken from the Tuesday, June 10th, 2025 Simulator User Group (SUG) meeting. They form a summary of the items discussed, and are not intended to be a full transcript. The notes were taken from my chat log of the meeting. No video this week.

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.
• These meetings are conducted (as a rule):
  • Every Tuesday at 12:00 noon SLT.
  • In text (no Voice).
  • At this location.
• Meetings are open to anyone with a concern / interest in the above topics, and form one of a series of regular / semi-regular User Group meetings conducted by Linden Lab.
• Dates and times of all current meetings can be found on the Second Life Public Calendar, and descriptions of meetings are defined on the SL wiki.

Simulator Deployments

• There are no planned deployments to any channels this week, only restarts.
• The Preflight RC will likely get a WebRTC update in the week; the simulator version won’t change but the service will be different – the release includes a fix for a file descriptor leak that lead to crashes. This does not require any viewer-side updates.

SL Viewer Updates

• Official Viewer: 2025.04 – 7.1.14.15192634334, issued May 25, promoted May 28 – No Change.
• Second Life Project glTF Mesh Import, version 7.1.14.15361077240 June 2 – No Change.
• Second Life Project Lua Editor Alpha (Aditi only), version 7.1.12.14888088240, May 13 –  No Change.

In Brief

• Parcel boundaries:
  • a long standing issue is that of people (mostly on Mainland) unexpectedly hitting parcels that are closed to public access (e.g. because the parcel edges onto a public road), and the ensuing confusion of getting bounced / losing the vehicle they are on, etc.
  • Rider Linden is hoping to be able to take another look at this in the near future, in terms of making such events less chaotic.

Just to remind people … the parcel bounce is for vehicles entering a parcel. It would check the permissions of all sitters and deny entry if any one sitter couldn’t enter. Essentially it would “bounce” the whole vehicle.

• • The response from those at the meeting was generally positive to this, in that it would end the situation of avatars being unseated from a vehicle which might still be able to enter / pass through the parcel.
• SLua event handling proposal is being worked on – but exactly what this means could not be specified at the meeting.
• A general discussion on mesh, mesh physics, uploads and decomposition, which appeared largely driven by a user seeking clarification, which strayed over into the realm of region crashers.
• The subject of possibly deprecating pathfinding on the simulator (and potentially removing Havok from the viewer, allowing for an alternation for mesh decomposition came up at the meeting: see the In Brief section of my TPVD Meeting Summary for week #23 2025, for more.
  • In addition, Leviathan Linden indicated that pulling “some” Havok dependencies from the viewer could make it easier for physics engine updates.
  • The led to a lengthy discussion on how pathfinding might be replaced, concerns from those who are using it, with no definitive solutions.

† The header images included in these summaries are not intended to represent anything discussed at the meetings; they are simply here to avoid a repeated image of a rooftop of people every week. They are taken from my list of region visits, with a link to the post for those interested.