Unity 控制物体透明度变化

1.需求

        给物体绑定一个脚本，这个脚本实现物体的透明度渐变变化，并且可以重置回原来的颜色。物体为Unity自带的材质Shader为Standard。

2.代码

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class TransparentChanger : MonoBehaviour
{/// <summary>/// 保存原颜色/// </summary>private Color[] oldColors;/// <summary>/// 控制透明度变化/// </summary>[Range(0, 1)]public float nalpha;private void Start(){Init();}private void Update(){SetOpacity(nalpha);}public void Init(){int num = 0;foreach (Renderer r in GetComponentsInChildren<Renderer>(true)){num += r.materials.Length;}oldColors = new Color[num];num = 0;foreach (Renderer r in GetComponentsInChildren<Renderer>(true)){foreach (Material m in r.materials){try{oldColors[num++] = m.color;}catch (System.Exception e){Debug.Log(e.Message);}}}}/// <summary>/// 重置回原来的颜色/// </summary>public void Reset(){int num = 0;foreach (Renderer r in GetComponentsInChildren<Renderer>(true)){foreach (Material m in r.materials){try{m.color = oldColors[num++];if (m.color.a >= 1){ChangeMaterialType(0, m);m.renderQueue = -1;}}catch (System.Exception e){Debug.Log(e.Message);}}}}public void SetOpacity(float alpha){int num = 0;foreach (Renderer r in GetComponentsInChildren<Renderer>(true)){foreach (Material m in r.materials){try{float mA = Mathf.Min(alpha, oldColors[num++].a);m.color = new Color(m.color.r, m.color.g, m.color.b, mA);if (mA >= 0.98f){ChangeMaterialType(0, m);}else{ChangeMaterialType(1, m);}}catch (System.Exception e){Debug.Log(e.Message);}}}}/// <summary>/// 切换材质的Standard Shader 渲染类型/// </summary>/// <param name="mType">0-Opaque, 1-Transparent</param>/// <param name="m">材质</param>void ChangeMaterialType(int mType, Material m){if(mType == 0){m.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);m.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);m.SetInt("_ZWrite", 1);m.DisableKeyword("_ALPHATEST_ON");m.DisableKeyword("_ALPHABLEND_ON");m.DisableKeyword("_ALPHAPREMULTIPLY_ON");m.renderQueue = -1;}else if(mType == 1){m.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One);m.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);m.SetInt("_ZWrite", 0);m.DisableKeyword("_ALPHATEST_ON");m.DisableKeyword("_ALPHABLEND_ON");m.EnableKeyword("_ALPHAPREMULTIPLY_ON");m.renderQueue = 3000;}}
}