submitted as a bug

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

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

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

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 thanks

https://we.tl/t-0lm0HGQ7Ep

it was my bad, I forgot to exclude the particles group from rendering, so its alpha with a big radius was dominating the alpha channel so it gave me a false flag of the particles number
all is great now, will keep you posted
Have a great Sunday

Hello Dr.
I was wondering if it is possible to match the number of the visible rendered particles with the one that is in the viewport ? I am aware that this may affect in a big part the workflow, but at I need to have a fidelity between the designed particles look / number / speed and the rendered ones to be able to previz before committing to render and publish to my client

Many thanks

Thanks Dr. Sassi, this answers perfectly my requests, I downloaded it and it look much closer to what I wanted to achieve
I guess ... hope your next year will be full of success and peace

hello
it is almost in the title, I am trying to create a flock of fireflies using particles, the idea is to make each particle appears "on and off" to trigger their lighting behaviour before they all "sync" together and turn on and off gradually to form a unity pattern. Since I have a good number of shots, I wanted to create a generic system, focusing on simplicity.
I tried the "particle node modifier" and "data mapper" with a minimum of success as I was not able to turn each off completely.
Then when I wanted to create the mesh objects "spheres" using mograph, I found out it doesn't inherit the radius value.
So I said to myself, maybe I can just inherit the position and animate the scale to turn on&off using fields, I think it tends to over complicate the pipeline instead of simplifying it
I don't hate the actual solution I had, but I was wondering if there is a tip to use on&off in case the client doesn't like the gradual scale changing that will influence the light intensity

Holidays Greetings FF_test01.c4d

Thanks a million
This helped me to solve the issue, I had to use a mesh deformer on a copy of the sunglasses to drive the center axed glasses to follow the one that doesn't work
Best regards