I have bought a particle system pack from the Asset Store of Unity: https://assetstore.unity.com/packages/vfx/particles/epic-toon-fx-57772 Now within my project, I want to use object trail effects for my player spaceship. So I have added my selected particle system object within the child of player spaceship object. But I can't able to see any trail when I run my project within Unity editor. Within the particle system, I have noticed that the emission rate is based on distance. How to emission this particle system? That is a big question in the mind. At present, its parent spaceship object is moving.