Version: 2017.3 (switch to 2017.4)
Particle Renderer (Legacy)
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World Particle Collider (Legacy)

The World Particle Collider is used to collide particles against other Colliders in the scene.


Property: Function:
Bounce Factor Particles can be accelerated or slowed down when they collide against other objects. This factor is similar to the Particle Animator’s Damping property.
Collision Energy Loss Amount of energy (in seconds) a particle should lose when colliding. If the energy goes below 0, the particle is killed.
Min Kill Velocity If a particle’s Velocity drops below Min Kill Velocity because of a collision, it will be eliminated.
Collides with Which Layers the particle will collide against.
Send Collision Message If enabled, every particle sends out a collision message that you can catch through scripting.


To create a Particle System with Particle Collider:

  1. Create a Particle System using GameObject > Create General > Particle System
  2. Add the Particle Collider using Component > Particles > World Particle Collider


If Send Collision Message is enabled, any particles that are in a collision will send the message OnParticleCollision() to both the particle’s GameObject and the GameObject the particle collided with.


  • Send Collision Message can be used to simulate bullets and apply damage on impact.
  • Particle Collision Detection is slow when used with a lot of particles. Use Particle Collision Detection wisely.
  • Message sending introduces a large overhead and shouldn’t be used for normal Particle Systems.
A Particle System colliding with a Mesh Collider
A Particle System colliding with a Mesh Collider

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Particle Renderer (Legacy)
Visual Effects Reference
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