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What is causing the particle system to not follow the density group? Use modifier stack is enabled, both objects are well subdivided and the canvas object is an unmodified plane.

enter image description here

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  • $\begingroup$ The emission is not keyframeable, one of the many shortcomings of the particle systems they promised to fix since 2015. Depending on what you want to achieve there are workarounds, I don't want to post any answers, though, because I would probably get downvoted. They are kind of hacky. $\endgroup$ Jul 23 '20 at 11:36
  • $\begingroup$ appricate the answer nonetheless, what I'm trying to accomplish is basically this youtu.be/OkAaLd0FdK0?t=3 but using dynamic paint, got all of it to work except for the sparks, and placing those manually is not really an option $\endgroup$
    – bowmanruto
    Jul 23 '20 at 21:48
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Unfortunately it's much more complicated than it should be. I can elaborate once you tell me if that's an option for you.

A possible workaround: Create a particle system sparks that is emitting continously. Place the PS where the laser hits the surface. If you want to randomize the bursts of the sparks some more, you can randomly turn on and off the visibility in render. Note that this might look weird if your spark lifetime is more than a couple of frames.

You could refine that a lot more using animation nodes, by grabbing the position of live particles and placing a custom object where they are relative to the point where the laser hits the surface. This way you have more control when turning them on and off.

Or you could try baking the sparks using physical objects and rigidbody physics. Bake 10 or so, parent them to an object that follows the laser, use animation nodes to only show 3 or 4 at a time and evaluate their f-curves, depending on the current frame and their "birth time".

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