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jamesyonan / brenda

Blender render farm software for Amazon Web Services
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blender jobs with linked cached cloth-sim objects #34

Open aceman500 opened 6 years ago

aceman500 commented 6 years ago

I have a blend scene with linked objects with cloth sim on them. The sim is done in the main scene file and the blend-cache is saved in the main scene file directioy . I packed the libraries tared up the blend file and the cache directory and submitted it to a work queue. Now as we all know, for whatever stupid reason, blender likes to delete thees kind of cache files next time the scene is opened. The usual workaround is to set proper permissions on the cache directory. However brenda runs blender as root on the instances and the permissions are meaningless, so blender deletes the cache files and breaks the cloth sim. Cloth sim works fine on local sims.. Blender does not wish to delete thees cache files.. Any ideas for a workaround?

tuttlen commented 6 years ago

If I am not mistaken brenda is a shell script? At least that is the one I used. If this is the case couldn't you modify permissions on the shell executable or add to a group that doesn't have permission to delete but has full control of that directory. Another way would be to alter the shell script updating or jailing the blender process.

On Sat, Jun 30, 2018 at 5:28 PM, aceman500 notifications@github.com wrote:

I have a blend scene with linked objects with cloth sim on them. The sim is done in the main scene file and the blend-cache is saved in the main scene file directioy . I packed the libraries tared up the blend file and the cache directory and submitted it to a work queue. Now as we all know, for whatever stupid reason, blender likes to delete thees kind of cache files next time the scene is opened. The usual workaround is to set proper permissions on the cache directory. However brenda runs blender as root on the instances and the permissions are meaningless, so blender deletes the cache files and breaks the cloth sim. Cloth sim works fine on local sims.. Blender does not wish to delete thees cache files.. Any ideas for a workaround?

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aceman500 commented 6 years ago

Yes, brenda is a collection of python scripts. I don't know yet how they function and my python is not so good, so I thought here would be a good place to ask. In addition I assume there is a reason it's run as root. Otherwise brenda is real cool and it runs flawlessly, The problem im having is not a brenda problem at all rather a problem with the way blender handles cached file linking which has been a known issue for quit a while now. My workaround is to just change the permissions so blender can't delete them and it works fine. But in the case of using brenda to kick off the jobs, that trick no longer works.

aceman500 commented 6 years ago

So at anyrate, I guess my basic question is: Can I run blender and the brenda scripts as a non-root user. I have a nice scene and I finally get to user the power of AWS and this annoying issue cropped up. Thanks for you help.

jldonovan3 commented 6 years ago

Has someone figured out a workaround or a solution to this? I think I'm having a similar problem trying to render a scene with a smoke sim. I have my directory with my .vdb cache that's referenced in the .blend file, and I get this:

loadTile: No noise tile '/tmp/blender_rt5jh0k/noise.wavelets' found.
Generating new 3d noise tile size=128^3 
saveTile: Noise tile file '/tmp/blender_rt5jh0k/noise.wavelets' saved.
Generating new 3d noise done
Noise tile file '/tmp/blender_ET1Ps2/noise.wavelets' loaded.

Then nothing. The process eventually gets killed. Googling turned up a bunch of old threads on the Blender dev bug reporting pages, but nothing that helps my situation.