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Topic: Blender 2.79 to 2.80

Nordfriese
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Joined: 2017-01-17, 18:07
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Posted at: 2019-10-30, 09:26

The last system upgrade replaced Blender version 2.79 (with which I modelled all frisian units so far) with 2.80, which apparently has some changes in the physics engine and therefore crashes immediately when trying to open one of the blend files.

BLI_assert failed: /build/blender-ydgaLT/blender-2.80+dfsg/source/blender/blenloader/intern/versioning_280.c:2417, blo_do_versions_280(), at 'ar_header'

So this is just to say that the blend files seem to be incompatible with anything newer than 2.79.

And a bit of a noob question, how do I tell APT to downgrade blender to 2.79? sudo apt install blender=2.79 just tells me version not found.


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fuchur
Joined: 2009-10-07, 14:01
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Posted at: 2019-10-30, 23:09

Did you try

sudo apt list -a blender

to see what versions are available? Maybe you need to specify 2.79b or something like that. I Don't have Linux here to try it myself.


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Nordfriese
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Posted at: 2019-10-31, 12:05

apt list -a blender shows me

blender/eoan,now 2.80+dfsg-3 amd64  [installiert]
blender/eoan 2.80+dfsg-3 i386

So I guess I would have to find some PPA or use the repos of an older ubuntu release…

I now installed blender 2.79b manually instead (without the packaging system) so I can at least view and edit blender models again


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stonerl
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Posted at: 2019-10-31, 16:08

@Nordfrise which blender-files are we talking about?


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stonerl
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Posted at: 2019-10-31, 16:51

I was able to open this blender file with 2.80:

https://bazaar.launchpad.net/~widelands-media-dev/widelands-media/widelands-media/view/head:/graphics/tribes/frisians/workers/baker/walk_e/baker.blend

Seems to be a problem with your installation, I assume.


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Nordfriese
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Posted at: 2019-10-31, 22:27

More precisely it´s all frisian buildings with certain blender physics in them, such as wind (waving flags). Namely, at least the idle anims of all fri warehouses and militarysites, idle and working of trainingsites, the ship sail anims, and fri&atl resis. Can you open those with 2.80?


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stonerl
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Posted at: 2019-11-01, 14:46

Nordfriese wrote:

More precisely it´s all frisian buildings with certain blender physics in them, such as wind (waving flags). Namely, at least the idle anims of all fri warehouses and militarysites, idle and working of trainingsites, the ship sail anims, and fri&atl resis. Can you open those with 2.80?

I'm able to open all of them without any problem. Since you're on Ubuntu, try the snap packages. Here you can choose between 2.80 & 2.79b


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Nordfriese
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Posted at: 2019-11-03, 17:57

Thanks for the hint, will try the snap packs.

2.80 reproducably crashes for me, but perhaps it is a linux-specific error…:

$ blender wl/widelands-media/graphics/tribes/frisians/buildings/warehouses/port/idle/port.blend
Read prefs: /home/benedikt/.config/blender/2.80/config/userpref.blend
Received X11 Error:
    error code:   167
    request code: 152
    minor code:   34
    error text:   GLXBadFBConfig
Received X11 Error:
    error code:   167
    request code: 152
    minor code:   34
    error text:   GLXBadFBConfig
Received X11 Error:
    error code:   167
    request code: 152
    minor code:   34
    error text:   GLXBadFBConfig
Received X11 Error:
    error code:   8
    request code: 152
    minor code:   34
    error text:   BadMatch (invalid parameter attributes)
Received X11 Error:
    error code:   8
    request code: 152
    minor code:   34
    error text:   BadMatch (invalid parameter attributes)
Received X11 Error:
    error code:   8
    request code: 152
    minor code:   34
    error text:   BadMatch (invalid parameter attributes)
Read blend: /home/benedikt/wl/widelands-media/graphics/tribes/frisians/buildings/warehouses/port/idle/port.blend
blender(BLI_system_backtrace+0x37) [0x55b8e2aab8f7]
blender(blo_do_versions_280+0x40df) [0x55b8e288df8f]
blender(+0x1175ac5) [0x55b8e2864ac5]
blender(blo_read_file_internal+0xb1e) [0x55b8e287933e]
blender(BLO_read_from_file+0x41) [0x55b8e28963b1]
blender(BKE_blendfile_read+0x48) [0x55b8e32c7f08]
blender(WM_file_read+0x147) [0x55b8e2cb7be7]
blender(+0x117194b) [0x55b8e286094b]
blender(BLI_argsParse+0xd7) [0x55b8e2a5ed77]
blender(main+0x277) [0x55b8e2827407]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f888e4381e3]
blender(_start+0x2e) [0x55b8e285fa1e]
BLI_assert failed: /build/blender-ydgaLT/blender-2.80+dfsg/source/blender/blenloader/intern/versioning_280.c:2417, blo_do_versions_280(), at 'ar_header'
Abgebrochen (Speicherabzug geschrieben)

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