Unity___粒子自适应

问题#

当分辨率发生变化后，UI上的粒子特效就会发生问题，比如：粒子特效无法贴合UI，UI大小发生变化，而粒子没有发生变化，如下图：

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

public class UIParticleScale : MonoBehaviour
{
    struct ScaleData
    {
        public Transform transform;
        public Vector3 beginScale;
    };
    const float design_width = 1920f;
    const float design_height = 1080f;
    private Dictionary<Transform, ScaleData> m_ScaleData = new Dictionary<Transform, ScaleData>();
    private void Start()
    {
        Refresh();
    }
    void Refresh()
    {
        float designScale = design_width / design_height;
        float scaleRate = (float)Screen.width / (float)Screen.height;
        foreach(ParticleSystem p in transform.GetComponentsInChildren<ParticleSystem>(true))
        {
            Debug.Log(p.gameObject.name);
            if (!m_ScaleData.ContainsKey(p.transform))
            {
                m_ScaleData[p.transform] = new ScaleData()
                {
                    transform = p.transform,
                    beginScale = p.transform.localScale
                };
            }
        }
        foreach(var item  in m_ScaleData)
        {
            if (scaleRate < designScale)
            {
                float scaleFactor = scaleRate / designScale;
                item.Value.transform.localScale = item.Value.beginScale * scaleFactor;
            }
            else
            {
                item.Value.transform.localScale = item.Value.beginScale;
            }
        }
    }
    ///<summary>
    ///子节点发生变化时重新刷新深度
    /// 
    /// </summary>
    private void OnTransformChildrenChanged()
    {
        Refresh();
    }
#if UNITY_EDITOR
    private void Update()
    {
        Refresh();
    }
#endif
}

Quote#

宣雨松：Unity3D游戏开发（第二版）P152