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I'm on the path to becoming a particle system expert, and right now I'm doing a silly logo particle system. It basically forms my username out of particles, but I want the particles to stay in place until a desired time. E.g., I want to add a keyframe to switch the particle physics from no physics to newtonian (or other) physics.

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  • $\begingroup$ You can't keyframe a switch value, you would need a numeric value to drive the effect you want so that you can animate that value. $\endgroup$ – Todd McIntosh Jun 23 '15 at 4:49
  • $\begingroup$ thats actually not quite true. a switch has a numeric value. 0 off, 1 on. the particle physics type is a enum, which is kind of like a list, and can be animated/keyframed. however, it is not possible to animate the particle physics type due to the limitations of the particle engine. $\endgroup$ – wardrums Jun 23 '15 at 10:15
  • $\begingroup$ If that's impossible, then how can I just keep them from falling until I want them to fall? $\endgroup$ – IntrepidPig Jun 25 '15 at 5:29
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You can animate the "Gravity" and "All" effectors under Field Weights of the particle system. Just keep them at 0 until you need them to affect your particles, then set them to the desired values to get the party going.

If your particles have an initial velocity you need to set keyframes for that as well.

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