ParticleSystem.MainModule.emitterVelocity

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public Vector3 emitterVelocity;

Description

The current Particle System velocity.

If you set this property to a particular value, the emitterVelocityMode automatically switches to ParticleSystemEmitterVelocityMode.Custom.

using UnityEngine;

[RequireComponent(typeof(ParticleSystem))]
public class Example : MonoBehaviour
{
    ParticleSystem.MainModule mainModule;

    void Start()
    {
        var particleSystem = GetComponent<ParticleSystem>();
        mainModule = particleSystem.main;
    }

    void OnGUI()
    {
        GUILayout.Label("Velocity: " + mainModule.emitterVelocity);
    }
}