A value of 100 translates to a 100% completion of the emission of particles on the first frame. At a value of 0, the simulation essentially starts at the first frame where no particles have been emitted. The pre-run value is a percentage value where 0% is no pre-run. This control is used to pre-run the system so that particles can be visible at the first frame. The normal workflow to pre-run the emitter is to open up the emitter extras and set the emitter pre-run to 100%. I think that is what is happening to the camera move. If you set keyframes for the emitter at 10 seconds and then slid the timeline so the keyframes were at - two minutes you would never see the change. particular is based on time and you have moved the layer so far back in time that the camera is seeing what happened a few seconds earlier instead of what is happening now. That actually makes a little bit of sense to me.
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