Hidden Depths

Hidden Depths covers three subjects that go beyond a single emitter. Each has an exercise that introduces it, and a page here that describes it in full.

Page	What it covers	Introduced in
Events	Firing another emitter, or running a script, at a moment in a particle’s life. The moments are: made, hit a surface, ended, removed.	Exercise 12
Nesting	Putting one emitter inside the RenderTemplate of another, so that every particle of the first fires the second.	Exercise 9
Editing stock ParticleEmitters, Trails and Beams	Using the Properties panel, the HUD and the tools on Roblox’s own ParticleEmitter, Trail and Beam, with no Transform.
What mesh particles give and what they cost	What a particle made from a real Part can do, and what it costs. How the Part_Icles module keeps that cost down. When a stock ParticleEmitter is the better choice.

Scripters will also want The event script and its payload, which lists everything an event script can read and do.