ParticleSystem.ExternalForcesModule.SetInfluence

参数

描述

在影响者列表中给定索引处分配力场。

当influenceFilter设置为ParticleSystemGameObjectFilter.List时，只有影响者列表中的力场会影响粒子系统。

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();
    }
}