Blender 2.80 crashes when opening a scene created by blender 2.7x with hierarchy duplication set to "group" #65054

New Issue

Alberto Demichelis · 2019-05-24T07:57:49+02:00

2019-05-24 07:57:49 +02:00

System Information
Operating system: Windows 10 Pro
Graphics card: RX 480

Blender Version
2.80, May 24, 01:38:50 - b3f96da2e6

Blender 2.80 crashes when opening a scene created by blender 2.7x that contains a hierarchy that has an object duplication set to "group" and is parented to a mesh.

How to reproduce
open attached blend file
bug1.blend

**System Information** Operating system: Windows 10 Pro Graphics card: RX 480 **Blender Version** 2.80, May 24, 01:38:50 - b3f96da2e605 Blender 2.80 crashes when opening a scene created by blender 2.7x that contains a hierarchy that has an object duplication set to "group" and is parented to a mesh. **How to reproduce** open attached blend file [bug1.blend](https://archive.blender.org/developer/F7064615/bug1.blend)

Alberto Demichelis commented

2019-05-24 07:57:49 +02:00

Added subscriber: @squirrel76

blender-admin commented

2019-05-24 07:57:49 +02:00

#65369 was marked as duplicate of this issue

blender-admin commented

2019-05-24 07:57:49 +02:00

#65249 was marked as duplicate of this issue

Bastien Montagne self-assigned this 2019-05-24 09:48:18 +02:00

Bastien Montagne removed their assignment 2019-05-27 12:16:13 +02:00

Campbell Barton was assigned by Bastien Montagne

2019-05-27 12:16:13 +02:00

Bastien Montagne commented

2019-05-27 12:16:13 +02:00

Added subscribers: @Sergey, @mont29

Bastien Montagne commented

2019-05-27 12:16:13 +02:00

Fix for #57934 (7fe3d1e7d7) is direct cause of this bug (since you cannot have an empty as armature…).

I don’t think we should ever allow changing object type in our versioning code (besides when current one is no more valid)… A lot of Blender relies on some specific types of objects, going over all object's usages to carefully decide what to do in each case would be a lot of work, and a highly error-prone one too.

So I would rather go with second solution from @Sergey here (Show a warning about unsupported instancing detected.). Or add a new empty to instantiate dupligroup (when there is one!), but imho that case is a bit too much exotic to be worth the effort.

Fix for #57934 (7fe3d1e7d7) is direct cause of this bug (since you cannot have an empty as armature…). I don’t think we should ever allow changing object type in our versioning code (besides when current one is no more valid)… A lot of Blender relies on some specific types of objects, going over all object's usages to carefully decide what to do in each case would be a lot of work, and a highly error-prone one too. So I would rather go with second solution from @Sergey here (Show a warning about unsupported instancing detected.). Or add a new empty to instantiate dupligroup (when there is one!), but imho that case is a bit too much exotic to be worth the effort.

Sergey Sharybin commented

2019-05-27 12:32:05 +02:00

You can call it exotic, but it is what is used in an official demo file which is featured on blender.org and is used in official benchmarks.

P.S. I am fine with warning, but i am not fine with silent failure on such files. I had enough confusion about this to be explained.

You can call it exotic, but it is what is used in an official demo file which is featured on blender.org and is used in official benchmarks. P.S. I am fine with warning, but i am not fine with silent failure on such files. I had enough confusion about this to be explained.

Bastien Montagne commented

2019-05-29 20:34:37 +02:00

Added subscriber: @Lewiatan

Piotr commented

2019-05-30 00:49:07 +02:00

I rather see this fixed or have a workaround of this problem, because I would be quite irritated being stuck in the outdated version of Blender because don't want to lose a large amount of work. As far as I've heard 2.80 was suppoused to be backward compatible. If DupliGroups were used by official Blender devs, they should work in 2.80 too. In my case, I had no idea I have had DupliGroup in my blend.file for god know for how long and I'd be happy to find out how to get rid off it.

Bastien Montagne commented

2019-06-03 17:30:26 +02:00

@Lewiatan DupliGroups are still working with empties, which are the only type of objects where they were making sense in the first place. Having those on other object types was just a nice source of confusion. And 2.80 is not 100% backward-compatible, though we try to keep it that way as much as possible. Projects started with 2.79 should be finished on that version really, unless you understand and know what you are doing when switching to 2.80.

Bastien Montagne commented

2019-06-03 17:31:18 +02:00

Added subscriber: @Darth-Blender

Campbell Barton was unassigned by Bastien Montagne

2019-06-04 14:45:14 +02:00

Bastien Montagne self-assigned this 2019-06-04 14:45:14 +02:00

Bastien Montagne commented

2019-06-04 14:45:14 +02:00

Added subscriber: @ideasman42

Bastien Montagne commented

2019-06-04 14:45:14 +02:00

Over one week, stealing this to fix now.

blender-admin commented

2019-06-04 15:18:37 +02:00

This issue was referenced by 2fb54ef86e

This issue was referenced by 2fb54ef86e57598e4d27987066db7a06a8269413

Bastien Montagne commented

2019-06-04 15:24:34 +02:00

Changed status from 'Open' to: 'Resolved'

Bastien Montagne closed this issue

2019-06-04 15:24:34 +02:00

Eelco Dolstra commented

2019-06-12 20:48:22 +02:00

Added subscriber: @edolstra

Eelco Dolstra commented

2019-06-12 20:48:22 +02:00

It's worth noting that https:*developer.blender.org/rB2fb54ef86e57598e4d27987066db7a06a8269413 appears to break the "classroom" demo (https:*download.blender.org/demo/test/classroom.zip). Opening it now prints a few dozen warnings like:

  Warning: Non-Empty object 'chair' cannot duplicate collection 'schoolDesk' anymore in Blender 2.80, removed instancing

and indeed numerous objects in the scene are now empties.

It's worth noting that https:*developer.blender.org/rB2fb54ef86e57598e4d27987066db7a06a8269413 appears to break the "classroom" demo (https:*download.blender.org/demo/test/classroom.zip). Opening it now prints a few dozen warnings like: ``` Warning: Non-Empty object 'chair' cannot duplicate collection 'schoolDesk' anymore in Blender 2.80, removed instancing ``` and indeed numerous objects in the scene are now empties.

Campbell Barton commented

2019-06-13 00:21:45 +02:00

https:*download.blender.org/demo/test/classroom.zip should be updated from https:*svn.blender.org/svnroot/bf-blender/trunk/lib/benchmarks/cycles/classroom/

Sergey Sharybin commented

2019-06-13 10:07:32 +02:00

@ideasman42, unless the web team is notified, or someone with the access to ftp actually does this, is not gonna to happen.

Campbell Barton commented

2019-06-13 10:25:57 +02:00

What's the best way to notify the web team?

Sergey Sharybin commented

2019-06-13 10:48:41 +02:00

Added subscriber: @pablovazquez

Sergey Sharybin commented

2019-06-13 10:48:41 +02:00

Ok, guess you didn't poke them yet. So i've updated the archive.

@pablovazquez , not sure if you want to make some further tweaks or notifications about demo being updated.

@mont29. opening file from command line does not show any warnings.

Ok, guess you didn't poke them yet. So i've updated the archive. @pablovazquez , not sure if you want to make some further tweaks or notifications about demo being updated. @mont29. opening file from command line does not show any warnings.

Bastien Montagne commented

2019-06-13 11:08:46 +02:00

@Sergey am getting bunch of warnings in the console… Fact that it does not show in UI is most certainly a separate issue related to how reports are working in Blender, looks like they are not 'ready' to show up during launch time for some reason…

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Blender 2.80 crashes when opening a scene created by blender 2.7x with hierarchy duplication set to "group" #65054