2018 SL UG updates #9/2: TPV Developer Meeting

Cece's Secret; Inara Pey, January 2018, on Flickr Cece’s Secretblog post

The following notes are taken from the TPV Developer meeting held on Friday, March 2nd 2018. A video of the meeting is embedded below, my thanks as always to North for recording and providing it. Time stamps in the text below will open the video in a new tab at the relevant point of discussion. Not this was a foreshortened meeting (20 minutes), with some lengthy periods of silence.

SL Viewers


  • The Nalewka Maintenance RC viewer, version (dated February 23rd) was promoted to de facto release status on Thursday, March 1st, 2018.
  • The Love Me Render RC viewer updated to version on Friday, March 2nd, which incorporates KDU and other security improves and (I believe) brings it to parity with the new release viewer.

All other official viewers in the pipe remain as per the start of the week:

  • Release channel cohorts:
    • Media Update RC viewer, version, February 15.
  • Project viewers:
  • Linux Spur viewer, version, dated November 17, 2017 and promoted to release status 29 November – offered pending a Linux version of the Alex Ivy viewer code.
  • Obsolete platform viewer, version, May 8, 2015 – provided for users on Windows XP and OS X versions below 10.7.

An update to the Media update RC is anticipated to bring it to parity with the new release viewer, and a new update to the 360-snapshot viewer is also anticipated, which hopefully addresses the fuzziness / resolution issues inherent in the current version (see my hands-on overview – link above – for more on this).

Upcoming Viewers

Maintenance Viewer

[3:00-3:09] A new Maintenance RC view should be appearing in week #10 (week commencing Monday, March 5th, 2018).

Bakes on Mesh Project Viewer

[3:10-4:30] A Bakes on Mesh project viewer, suitable for use with Bakes on Mesh test regions on Aditi is with th Lab’s QA team, and may be appearing in week #10.

Bakes on Mesh is a project to extend the current avatar baking service to allow wearable textures (skins, tattoos, clothing) to be applied directly to mesh bodies as well as system avatars. It does so by allowing the faces on a mesh body / head to be defined in terms that the Baking Service can understand, allowing system layers to be applied to those faces, using 1024×1024 textures (rather than the 512×512 currently used by the Baking Service).

It’s important to note that the project viewer (with simulator-side support) is only the first phase of this project (essentially providing the 1024×1024 texture support), and there will still be much more to be done after the project viewer has been made available. Please refer to my Bakes on Mesh updates, which form a part of my weekly Content Creation User Group updates, for more specific information on this project.

Animesh Update

[7:56-9:06 – with audio break-up] The current focus remains:

  • Viewer-side bug fixes.
  • Performance profiling for Animesh complexity and LI costs.

The next step is to deploy updated simulator code in support of the limits so it can be put to the test.

DDoS Attack

[10:38-11:00] Some have experienced audio stream issues since the widespread amplified,UDP-based Distributed Denial of Service (DDoS) attack against memcached servers which took place across the Internet on Monday, February 26th / Tuesday, February 27th (memcached is a distributed memory caching system and is used to speed up dynamic database-driven websites and Internet-facing services by caching data and objects in RAM). As audio streams is handled by separate services (e.g. Shoutcast). It is possible they may have been suffering after-effects of the attack.

[11:05-11:56] The Lab has little to add to the blog post published by April Linden on the situation, other than they continue to harden systems and services. Overall, Second Life can come under frequent DDoS attack, but it myriad of parts are generally robust enough to withstand such attacks without them reaching the point of impacting users.

Off-Line IM Delivery Failures on Logging-in

[5:10-7:00] A project has been initiated to try to resolve problems with the viewer failing to receive all off-line IMs when a use logs in.

The cause appears to be that when a user logs-in, the simulator floods the viewer with UDP messages for the off-line IMs either before the viewer is ready to handle them, or as such a rate, messages are dropped.

To correct this, the Lab is making an API change in the simulator “in the next couple of weeks” and will be introducing a new viewer cap. Together, these will allow the viewer to indicate when it is ready to receive and handle off-line IMs, and ensure that the simulator correctly packages the messages for delivery, rather than simply sending a flood of items to the viewer.

These updates will hopefully be made available in a manner which allows TPVs to merge them relatively easily, rather than forming one part of a huge number of changes to the viewer.

In Brief

  • [4:35-4:53] Viewer Texture Memory Use: the Lab still plans to look at the question of texture memory use within the viewer, although it is noted this is turning into a “bit of a minefield”.
  • [12:02-13:05] Dullahan Linux: there have been requests for the Lab to provide a Linux Dulllahan build of the viewer (see this repository). Callum Linden has confirmed he’ll try to put further work into this before moving on to a new project, to at least leave it in a state others with more knowledge of Linux might be able to use.
  • [15:35-15:48] Disabling UDP inventory messaging: this is still being targeted for summer 2018, but there is currently no confirmed date.

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