Control how a Particle System calculates its velocity.
| Transform | Calculate the Particle System velocity by using the Transform component. |
| Rigidbody | Calculate the Particle System velocity by using a Rigidbody or Rigidbody2D component, if one exists on the GameObject. |
| Custom | When the Particle System calculates its velocity, it instead uses the custom value set in ParticleSystem.MainModule.emitterVelocity. |