ParticleSystem.TriggerModule.SetCollider

Parameters

Description

Sets a Collision shape associated with this Particle System trigger.

If the index is greater than the number of Colliders currently assigned to the Particle System, Unity adds empty entries to ensure the list is large enough.

using UnityEngine;
using UnityEditor;
using System.Collections.Generic;
using UnityEngine.EventSystems;

[RequireComponent(typeof(ParticleSystem))]
public class ExampleClass : MonoBehaviour
{
    private ParticleSystem ps;
    public bool enter;
    public bool exit;
    public bool inside;
    public bool outside;

    void Start()
    {
        ps = GetComponent<ParticleSystem>();

        var sphere = GameObject.CreatePrimitive(PrimitiveType.Sphere);
        sphere.transform.parent = ps.transform;
        sphere.transform.localPosition = new Vector3(0.0f, 0.0f, 3.0f);
        sphere.transform.localScale = new Vector3(3.0f, 3.0f, 3.0f);
        sphere.GetComponent<MeshRenderer>().material = new Material(Shader.Find("Particles/Standard Unlit"));

        var shape = ps.shape;
        shape.enabled = false;

        var trigger = ps.trigger;
        trigger.enabled = true;
        trigger.SetCollider(0, sphere.GetComponent<Collider>());
    }

    void Update()
    {
        var trigger = ps.trigger;
        trigger.enter = enter ? ParticleSystemOverlapAction.Callback : ParticleSystemOverlapAction.Ignore;
        trigger.exit = exit ? ParticleSystemOverlapAction.Callback : ParticleSystemOverlapAction.Ignore;
        trigger.inside = inside ? ParticleSystemOverlapAction.Callback : ParticleSystemOverlapAction.Ignore;
        trigger.outside = outside ? ParticleSystemOverlapAction.Callback : ParticleSystemOverlapAction.Ignore;
    }

    void OnGUI()
    {
        enter = GUI.Toggle(new Rect(25, 40, 200, 30), enter, "Enter Callback");
        exit = GUI.Toggle(new Rect(25, 80, 200, 30), exit, "Exit Callback");
        inside = GUI.Toggle(new Rect(25, 120, 200, 30), inside, "Inside Callback");
        outside = GUI.Toggle(new Rect(25, 160, 200, 30), outside, "Outside Callback");
    }

    void OnParticleTrigger()
    {
        if (enter)
        {
            List<ParticleSystem.Particle> enterList = new List<ParticleSystem.Particle>();
            int numEnter = ps.GetTriggerParticles(ParticleSystemTriggerEventType.Enter, enterList);

            for (int i = 0; i < numEnter; i++)
            {
                ParticleSystem.Particle p = enterList[i];
                p.startColor = new Color32(255, 0, 0, 255);
                enterList[i] = p;
            }

            ps.SetTriggerParticles(ParticleSystemTriggerEventType.Enter, enterList);
        }

        if (exit)
        {
            List<ParticleSystem.Particle> exitList = new List<ParticleSystem.Particle>();
            int numExit = ps.GetTriggerParticles(ParticleSystemTriggerEventType.Exit, exitList);

            for (int i = 0; i < numExit; i++)
            {
                ParticleSystem.Particle p = exitList[i];
                p.startColor = new Color32(0, 255, 0, 255);
                exitList[i] = p;
            }

            ps.SetTriggerParticles(ParticleSystemTriggerEventType.Exit, exitList);
        }

        if (inside)
        {
            List<ParticleSystem.Particle> insideList = new List<ParticleSystem.Particle>();
            int numInside = ps.GetTriggerParticles(ParticleSystemTriggerEventType.Inside, insideList);

            for (int i = 0; i < numInside; i++)
            {
                ParticleSystem.Particle p = insideList[i];
                p.startColor = new Color32(0, 0, 255, 255);
                insideList[i] = p;
            }

            ps.SetTriggerParticles(ParticleSystemTriggerEventType.Inside, insideList);
        }

        if (outside)
        {
            List<ParticleSystem.Particle> outsideList = new List<ParticleSystem.Particle>();
            int numOutside = ps.GetTriggerParticles(ParticleSystemTriggerEventType.Outside, outsideList);

            for (int i = 0; i < numOutside; i++)
            {
                ParticleSystem.Particle p = outsideList[i];
                p.startColor = new Color32(0, 255, 255, 255);
                outsideList[i] = p;
            }

            ps.SetTriggerParticles(ParticleSystemTriggerEventType.Outside, outsideList);
        }
    }
}