Access the particle system external forces module.
Particle system modules do not need to be reassigned back to the system; they are interfaces and not independent objects.
using UnityEngine; using System.Collections;
public class ExampleClass : MonoBehaviour { void Start() { ParticleSystem ps = GetComponent<ParticleSystem>(); var ex = ps.externalForces; ex.enabled = true; ex.multiplier = 0.1f; } }
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