Version: 2019.2
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ParticleSystem.ExternalForcesModule.SetInfluence

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public void SetInfluence(int index, ParticleSystemForceField field);

Parameters

indexIndex to assign the Force Field.
fieldForce Field that will be assigned.

Description

Assigns the Force Field at the given index in the influencers list.

When influenceFilter is set to ParticleSystemGameObjectFilter.List then only Force Fields in the influencers list will affect the Particle System.

using UnityEngine;

public class Example : MonoBehaviour { public ParticleSystem system; public ParticleSystemForceField field1; public ParticleSystemForceField field2;

ParticleSystem.ExternalForcesModule m_ExternalForcesModule;

void Start() { if (system == null) { Debug.LogError("Please assign a Particle System to `system`."); enabled = false; return; }

if (field1 == null || field2 == null) { Debug.LogError("Please assign a ParticleSystemForceField to `field1` and `field2`."); enabled = false; return; }

m_ExternalForcesModule = system.externalForces; m_ExternalForcesModule.enabled = true; m_ExternalForcesModule.influenceFilter = ParticleSystemGameObjectFilter.List; m_ExternalForcesModule.AddInfluence(field1); }

void OnGUI() { Debug.Assert(m_ExternalForcesModule.influenceCount == 1); var currentForceField = m_ExternalForcesModule.GetInfluence(0);

GUILayout.BeginHorizontal(); GUILayout.Label("Influence: " + currentForceField.name);

if (GUILayout.Button("Toggle")) { m_ExternalForcesModule.SetInfluence(0, currentForceField == field1 ? field2 : field1); }

GUILayout.EndHorizontal(); } }