Crash when near or in sight of previously uploaded glTF Mesh

[aiaustin]

Environment

Second Life Release 7.1.13.14343205944 (64bit)
Release Notes

You are at 128.0, 128.0, 32.5 in Morris located at simhost-0103149d6e3418fac.aditi
SLURL: secondlife://Aditi/secondlife/Morris/128/128/32
(global coordinates 255,360.0, 256,384.0, 32.5)
Bleeding Edge 2025-04-24.14649052994
Release Notes

CPU: Intel(R) Xeon(R) CPU E5-1620 v3 @ 3.50GHz (3491.92 MHz)
Memory: 32689 MB
OS Version: Microsoft Windows 10 64-bit (Build 19045.5796)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: NVIDIA GeForce GTX 1080/PCIe/SSE2

Windows Graphics Driver Version: 32.0.15.7283
OpenGL Version: 4.6.0 NVIDIA 572.83

Window size: 1249x864
Font Size Adjustment: 96pt
UI Scaling: 1
Draw distance: 128m
Bandwidth: 10000kbit/s
LOD factor: 1.375
Render quality: 3
Texture memory: 8192MB
Disk cache: Max size 1638.4 MB (7.8% used)

J2C Decoder Version: KDU v7.10.4
Audio Driver Version: OpenAL, version 1.1 ALSOFT 1.24.2 / OpenAL Community / OpenAL Soft: OpenAL Soft
Dullahan: 1.14.0.202408091639
CEF: 118.4.1+g3dd6078+chromium-118.0.5993.54
Chromium: 118.0.5993.54
LibVLC Version: 3.0.21
Voice Server Version: Vivox 4.10.0000.32327.5fc3fe7c.5942f08

Packets Lost: 0/6,745 (0.0%)
April 29 2025 03:58:51

Description

A newly uploaded Collada mesh to the Beta grid was placed in world at this location by avatar "Be Austin" on 29-Apr-2025. Nominal mesh upload cost was L$211. As it stared to rez in world the viewer crashed.

secondlife://Aditi/secondlife/Rumpus%20Room%202048/128/128/22

If I try to relog to that location it instantly crashes the viewer using Second Life Release 7.1.13.14343205944 or Firestorm Beta Firestorm 7.1.13 (77930) with the original avatar that placed the object (Be Austin) or an alternative (Ai Austin).

If I go to an adjacent region like Rumpus Room 2049 I can log back in, but as soon as the camera approaches the location of the mesh the viewers crash.

There are two issues here:

1. The viewer crash issue for a mesh that has passed successfully through the Collada Mesh Uploader.

2. The issue of a "stuck" region Rumpus Room 2048 where I cannot go in an remove the item causing the issue. Its a vehicle near to secondlife://Aditi/secondlife/Rumpus%20Room%202048/128/128/22. Perhaps a way to fix this would be to remove the item specifically if a dev can access the region without crashing, or just to remove any object owned by "Be Austin" currently on Rumpus Room 2048.

secondlife://Aditi/secondlife/Rumpus%20Room%202048/128/128/22

Reproduction steps

1. Log on to Beta Grid
2. Try to teleport to secondlife://Aditi/secondlife/Rumpus%20Room%202048/128/128/2
3. Notice Crash of viewer.
4. Try to find a way to remove vehicle mesh created on 29-Apr-2025 by Be Austin at roughly the centre of that region to stop the region crashing viewers instantly.

[aiaustin]

It may be useful to know that the mesh in question was an experiment to "clean up" a Blender file, exported to glb, tidied up in https://glb.report which also makes it a smaller mesh, then imported back to Blender and exported to Collada for import to Second Life Beta grid via the Collada mesh Uploader.

[aiaustin]

Just to be clear, the mesh was a Collada export from Blender and Collada mesh uploader item. I only point that out as the commit seems to relate to glTF variants. Although glTF tools and formats were involved in the pathway to generate this specific mesh, as I was experimenting with simplifying the mesh. Item was a simple mesh with no rigging or animation also.

[aiaustin]

Looks like it was NOT the rezzing on Rumpus Room 2048 of the newly uploaded Collada mesh that happened to show this issue.

PREVIOUSLY uploaded glTF meshes that were opened, saved and rezzed back in world are probably the cause of the issue. I established this (with Hecklezz's help) by approaching near three such meshes I had on the region. As they came within draw distance of them I crashed each time. I have now deleted those three meshes and with sort view distance can be in the area that previiously caused a crash.

HOWEVER, if I increase draw distance to around 128m and definitely 256m I crash again. This is probably due to OTHER users meshes in the region which will continue to cause issues. Maybe all such uploaded, saved and rezzed in world using the OLD glTF mesh mechanism need to be cleared out?