ParticleSystem.EmitParams.velocity

Description

Override the velocity of emitted particles.

See Also: ParticleSystem.Particle.velocity.

#pragma strict
// In this example we have a particle system emitting aligned particles; we then emit and override the position and velocity every 2 seconds.
private var system: ParticleSystem;
function Start() {
	// A simple particle material with no texture.
	var particleMaterial: Material = new Material(Shader.Find("Particles/Alpha Blended Premultiply"));
	// Create a particle system.
	var go: var = new GameObject("Particle System");
	go.transform.Rotate(-90, 0, 0);
	// Rotate so the system emits upwards.
	system = go.AddComponent.<ParticleSystem>();
	go.GetComponent.<ParticleSystemRenderer>().material = particleMaterial;
	// Every 2 seconds we will emit.
	InvokeRepeating("DoEmit", 2.0f, 2.0f);
}
function DoEmit() {
	// Here we will override the position and velocity. All other parameters will use the behavior defined in the Inspector.
	var emitParams: var = new ParticleSystem.EmitParams();
	emitParams.position = new Vector3(0.0f, 0.0f, 0.0f);
	emitParams.velocity = new Vector3(0.0f, 0.0f, -2.0f);
	system.Emit(emitParams, 1);
}

using UnityEngine;

// In this example we have a particle system emitting aligned particles; we then emit and override the position and velocity every 2 seconds.
public class ExampleClass : MonoBehaviour
{
    private ParticleSystem system;

    void Start()
    {
        // A simple particle material with no texture.
        Material particleMaterial = new Material(Shader.Find("Particles/Alpha Blended Premultiply"));

        // Create a particle system.
        var go = new GameObject("Particle System");
        go.transform.Rotate(-90, 0, 0); // Rotate so the system emits upwards.
        system = go.AddComponent<ParticleSystem>();
        go.GetComponent<ParticleSystemRenderer>().material = particleMaterial;

        // Every 2 seconds we will emit.
        InvokeRepeating("DoEmit", 2.0f, 2.0f);
    }

    void DoEmit()
    {
        // Any parameters we assign in emitParams will override the current system's when we call Emit.
        // Here we will override the position and velocity. All other parameters will use the behavior defined in the Inspector.
        var emitParams = new ParticleSystem.EmitParams();
        emitParams.position = new Vector3(0.0f, 0.0f, 0.0f);
        emitParams.velocity = new Vector3(0.0f, 0.0f, -2.0f);
        system.Emit(emitParams, 1);
    }
}