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I'd like to spawn particles that change size over time. It would be nice if I could have complete control over how big they are at each percentage of their lifetime, but that is not a necessary feature. (I'm rendering the particles as objects.)

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  • $\begingroup$ you can find a method to increase or decrease their size here: youtube.com/watch?v=67024UyCZ6A $\endgroup$ – moonboots Jul 19 '18 at 17:36
  • $\begingroup$ Works perfectly! Thank you! Please feel free to write that up as an answer so I can officially accept it. $\endgroup$ – Legoman Jul 19 '18 at 18:02
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Here is the method to increase the particles size through time, as explained by BlenderShortTests in one of his tutorials:

  • Select your emitter and go to Properties > Particles, click New.
  • In Properties > Particles > Render, click Object and choose the object that will be emitted as particles and its size.
  • Go to your 3D view and press alt A to launch a preview of your emission animation, then stop it somewhere in its course.
  • In Properties > Particles > Textures, add New and give it a name.
  • In Properties > Textures > Type, choose Blend.
  • In Properties > Textures > Colors, click Ramp.
  • In Properties > Textures > Mapping > Coordinate > choose Strand/Particles.
  • In Properties > Textures > Influences, unclick Time and enable Size.
  • In Properties > Textures > Colors, play with the Ramp controller to increase or decrease the size of your emitted object through time.

The video also explains how to make a fade out effect on the particles: https://www.youtube.com/watch?v=67024UyCZ6A

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