Particles emitting from a 3D rotating shape’s edge

In Fixin’ FX, people send me their problematic projects and I see where I can help. Sometimes it’s a missing instruction from a tutorial, othertimes it’s something not working as it should, but in this case, Adobe Community user Stefan Cargoski posted on the forum asking for help. They set up a 3D shape layer and wanted to use Trapcode Particular to trace its outline as it rotated in 3D space.

There’s a couple of ways this work, but I ended up showing Stefan the expressions method, as this would also work for CC Particle World. (Don’t worry, I explain the simpler method too).

Need help with your project? If you have a problem you think I can help with, drop me a line at the link: https://shiveringcactus.net/vfx-clinic

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