Particle System 1: Modules
An introduction to Unity's Particle System and its module-based architecture. Learn how the particle system is structured and how modules control every aspect of particle behaviour.
Overview
Unity’s Particle System is one of the most powerful tools in the engine for creating visual effects — fire, smoke, rain, explosions, magic spells, and more. In this first lesson we break down the module-based architecture that makes it so flexible.
What you’ll learn
- What a Particle System component is and how to add one to a GameObject
- How the module system works — each module controls a specific aspect of the particles (emission, shape, color, size, physics, etc.)
- The Main module: duration, looping, start lifetime, start speed, start size, start color, gravity modifier
- How to preview particle effects in the Scene view without entering Play mode
Key concepts
Particles are short-lived GameObjects emitted by the system. Each one has:
- A lifetime (how long it exists)
- A velocity (where it moves)
- A size and color (which can change over time)
The Module system lets you layer behaviour on top of these properties. Most modules are disabled by default — you enable only what you need, keeping performance overhead minimal.
Tips
- Use the Open Editor button in the Particle System inspector to get a wider view of all modules
- The Simulate speed slider in the Scene view is invaluable for previewing slow or fast effects
- Always check the Looping checkbox for ambient effects (fire, smoke); uncheck it for one-shot effects (explosions)
Next steps
In Lesson 2 we’ll dive into the Emission and Shape modules, which control how many particles are emitted and in what spatial pattern.