using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/**
 UI特效遮罩
1.需要将ScrollRect 的遮罩Mask 换为 2D Mask
 2.将特效的Render里面的   Masking  设置为
 */
public class UIParticleMaskControll : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        
    }

    public void SetParticeMasking(GameObject go)
    {
        var pers = go.GetComponentsInChildren<ParticleSystemRenderer>();
        foreach (ParticleSystemRenderer item in pers)
        {
            item.maskInteraction = SpriteMaskInteraction.VisibleInsideMask;
        }
    }

    /// <summary>
    /// 设置遮罩范围
    /// </summary>
    public void SetMaskRect(float width,float height)
    {

        var xScale = width / 4 * 100;//像素转换  4指的是sprite的width
        var yScale = height / 4 * 100;//像素转换  4指的是sprite的height
        transform.localScale = new Vector3(xScale, yScale, 1);
    }

    // Update is called once per frame
    void Update()
    {
        
    }
}

ParticleSystemRenderer-maskInteraction - Unity 脚本 API