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I seem to have a problem with particles in cycles. I'm using 2.79. I can create a particle system and use an object as the particle, but whenever I change any parameter (number of particles, rotation, etc.) they disappear not only from viewport, but also from the render. Also, when I enable the Rotation box and tweak the orientation trying to randomize it, it doesn't work, and after a couple of infructuous modification, particles disappear too. I need to know if this might be a bug or user error.

I must say particles are being used for a still image, so I am using the first frame both as the start and end of the particle emission. I have done this in the past with success, but now it won't work.

Thank you in advance.

Thank you very much. Problem is solved, I was not working at the first frame, but further into the animation. I went back to the first frame and everything works as expected.

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Every time you change parameters for particles, the cache for the simulation needs to be updated (re-cached).

For Blender 2.79

Press Alt+A to run the simulation again.

In Blender 2.8

Move to the first frame of the timeline (or the first frame of the simulation) and press the space bar

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  • $\begingroup$ Thank you very much, I didn't have the timeline up but for some reason I was working at the 156th frame instead of the first. I must have accidentally pressed the shortcut at some point while modelling. $\endgroup$
    – kramkor
    May 8, 2018 at 11:56

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