How to do it...

To create a particle system from scratch, follow these steps:

1. Start a new Unity 3D project.
2. Move Main Camera to Position (0, 1, -20) so that we can see more of the scene GameObjects.

Now, let's create a floor and wall from scaled 3D cubes, as a location to view our particle system.

3. Create a 3D Cube GameObject named Cube-wall. In the Inspector window, set its Position to (1, 0, 3) and its Scale to (20, 20, 1).
4. Create a second 3D Cube GameObject named Cube-floor. In the Inspector window, set its Position to (0, -1, 0), and its Scale to (20, 1, 20).
5. Often, the visual effect from a Particle System comes from a GameObject, so let's create a 3D Sphere at a Position of (0, -0.5, 0) so that it appears to be embedded in the ground and the source of our particles. Check the Is Trigger setting for the sphere&apos...