basic particles turn on and off randomly
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It seems it is getting me the caching issue using the new particles system, long story short, I am trying caching the scene here, bit it keeps crashing or freezing
I tried to debug it by recreating it, I think the moment where I ask for negative time values to get my preroll right this is where things get to be messed up
I am attaching the scene, but no need if I can find a proper and clean way to get like pre-roll of certain number of frames with caching
many thankshttps://we.tl/t-0lm0HGQ7Ep
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Hi resort-sand,
Thanks for the file.
Please run this version of your Project:
https://projectfiles.maxon.net/Cineversity_Forum_Support/2026_PROJECTS_DRS/20260112_CV4_2026_drs_26_PAcp_11.zipI used these steps:
The Cache Object to cache (not the Cache Scene)
The Remesh was converted into a polygon mesh (Object Manager>Objects> Modify> Current State To Object
As wild guess as the Clones were set to Multi-Instances.When this works for you, and all is as you need it, we can pinpoint more where it comes from and file a report.
All the best
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P.S.: This evening I explored this a little bit more.
Can you share if that happens as well, based on the scene you shared when you create just the cache for the particles - Cache Object?Thank you!
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Good morning Dr.
I made more debugging based on your recommendations
It seems that only the Mograph object being active is causing the crash, all the other elements: cache scene Vs object, baking geos were not the cause of the crash
I will keep digging
cheers -
Thank you very much, resort-sand.
Does it make a difference if you have it on an Instance Render Instance or a Multi-Instance?
So, caching while the Cloner is off works, and switching the Cloner on after caching shows problems or not?
Either way, that needs to go to Tech-support, so it can move along the fixing "pipeline".
https://www.maxon.net/en/support-center
If you have a minute, please use this URL. Thank you very much!Have a great morning as well. It is past midnight here, and I will call it a day soon.
Cheers
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Hello
Once the mograph is deactivated
the caching runs without no issue, upon finishing, I activated it 
all works normally, it didn't matter after if it is normal instances or multi instance
Thanks for being supportive
Best -
I noticed also the following,
-putting the mograph in Multi Instance with motion blur renders black frames, back to normal instance object and motion blur works
-in AOV with activating motion blur pass (with or without) motion blur activated renders black frames
At least this happens in my scene, maybe I am not aware of the motion blur limitations with particles or mograph based objects
Cheers -
Thank you very much, resort-sand, for the extra data.
I'm glad we got at least the crashes tamed via the workaround.
There is surely something not OK. I hope the tech support is getting to the bottom of it quickly.
The evaluation of a bug is done by the tech support, which is not my scope here.
All the best
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submitted as a bug
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Thank you so much, resort-sand.
Sorry that you had to experience a problem in the first place.
Fingers crossed that the switch on and off "dance" is soon not needed anymore.
My best wishes for your project!
