Crash when trying to snap to instances on an object #96367

System Information
Operating system: Linux Mint 20.3 Cinnamon kernel 5.13.0-35
Graphics card: 3400G

Blender Version
Broken: 3.1.0-alpha+master.8c4edd1b379d-linux.x86_64-release.tar.xz (In case helpful; commit causing the crash is possibly between 2021 Dec 27 - 28th)
Working: -

Short description of error
Possibly related to #96536 (Modifiers don't work on particle instances of a hidden object)
Crash with recent Blender 3.1 / 3.2 versions. Following conditions must apply...

Object with a particle system
Mesh object used for the particle system has 'Auto Smooth' enabled
Camera in a Collection (placed before the object with a particle system)
Camera 'Focus on Object' = the object with a particle system

Exact steps for others to reproduce the error

Open file 'Camera 'Focus on Object' - particle system issue.blend'.
with 'Camera' collection placed first, snapping the Cursor or enabling Navigation + gravity + moving using mouse/keys = crash.
Camera 'Focus on Object' - particle system issue.blend

Kind regards.

Added subscriber: @david_black

Added subscriber: @mano-wii

Thanks for the report but I'm not able to replicate the problem.
How do you switch the collections?
I tried drag and dropping but nothing strange happened:

Also could you test the latest daily build?
https://builder.blender.org/download/daily/

Changed status from 'Needs Triage' to: 'Needs User Info'

Thank you @mano-wii for your time and tests.

After some digging, found the first issue is a Blender 3.0 bug, and also happens in 3.1 when using the Splash screen 'Load 3.0 Settings', when previous settings are imported the new 'GPU Subdivision' option is disabled by default.

Preferences > Viewport > Subdivision > GPU Subdivision

If possible, GPU Subdivision = true would be a helpful default when older settings are imported?

`

Just tried blender-3.2.0-alpha+master.b959f603da45-linux.x86_64-release.tar.xz for you... the 3.1 (and newer) crash issue still stands while trying to use Navigation + gravity if the following apply.

3.1 crash:

Object with a particle system - linked
Camera placed in a Collection (before the linked object)
Camera 'Focus on Object' = the linked object

Thanks again.

Changed status from 'Needs User Info' to: 'Needs Triage'

I was able to replicate both problems with the new information provided.
I preferred to separate the reports because, although they may be related, each bug was introduced in different versions. And one is affected by GPU Subdvision.

Thanks for your continued help. Originally considered creating two bug reports.

Just found today, crash also happens with local (non-linked) objects.
Doesn't matter if 'GPU Subdivision' is enabled / disabled if the mesh used for a particle system has 'Auto Smooth' enabled.

First post updated.

Changed status from 'Needs Triage' to: 'Confirmed'

This issue was referenced by 295b6e8230

Changed status from 'Confirmed' to: 'Resolved'

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Crash when trying to snap to instances on an object #96367