遮挡透明若没有渐变实现方法：
1、透明中物体存在list中
2、每过一段时间（可以每帧，但是流畅性会降低）摄像机发送一条射线向玩家，out hitInfo
3、list与hitInfo比对，将在list中但是没有在hitInfo中的物体转变成不透明，list.remove；将在hitInfo中但是没有在list中转变成透明，list.add
若有渐变，实现比较麻烦一点，物体有两个状态：转变成透明过程中、转变成不透明过程中，添加两个list（InTransparent，outTransparent）对应两种状态，那么维护两个list即可：
1、未遮挡->遮挡，查看outTransparent，如果有该物体，从outTransparent移入InTransparent，outTransparent remove；如果没有添加新的加入InTransparent
2、遮挡->未遮挡，查看InTransparent，如果有该物体，从InTransparent移入outTransparent，InTransparent remove；如果没有添加新的加入outTransparent
摄像机CameraFollow.cs：
1 public class CameraFollow : MonoBehaviour 2 { 3 4 public static CameraFollow instance; 5 public Transform Player; 6 7 public List<CameraMaskInfo> Mask; 8 public List<CameraMaskInfo> InTransparentList; 9 public List<CameraMaskInfo> OutTransparentList;10 11 RaycastHit[] hitInfo;12 13 void Awake()14 {15 instance = this;16 }17 void Start()18 {19 StartCoroutine(IEMask());20 }21 public void ClearMask()22 {23 Mask.Clear();24 InTransparentList.Clear();25 OutTransparentList.Clear();26 }27 28 IEnumerator IEMask()29 {30 while (true)31 {32 hitInfo = Physics.CapsuleCastAll(FollowTarget.position + Vector3.up * 0.2f, FollowTarget.position - Vector3.up * 0.1f, 0.2f, (transform.position - FollowTarget.position).normalized, 100f, layerMask);33 bool flag;34 for (int i = Mask.Count - 1; i >= 0; i--)35 {36 flag = false;37 for (int j = 0; j < hitInfo.Length; j++)38 {39 if (Mask[i].GetObj() == hitInfo[j].collider.gameObject)40 {41 flag = true;42 break;43 }44 }45 if (!flag)46 {47 Mask[i].PutOutTransparent();48 Mask.RemoveAt(i);49 }50 }51 52 for (int i = 0; i < hitInfo.Length; i++)53 {54 flag = false;55 for (int j = 0; j < Mask.Count; j++)56 {57 if (hitInfo[i].collider.gameObject == Mask[j].GetObj())58 {59 flag = true;60 break;61 }62 }63 if (!flag)64 {65 CameraMaskInfo maskInfo = new CameraMaskInfo(hitInfo[i].collider.gameObject);66 maskInfo.PutInTransparent();67 Mask.Add(maskInfo);68 }69 }70 }71 yield return new WaitForSeconds(0.2f);72 }73 74 void Update()75 {76 for (int i = InTransparentList.Count - 1; i >= 0; i--)77 {78 InTransparentList[i].Sub();79 }80 81 for (int i = OutTransparentList.Count - 1; i >= 0; i--)82 {83 OutTransparentList[i].Add();84 }85 }86 }
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遮挡物体CameraMaskInfo.cs：
using UnityEngine;using System.Collections;public class CameraMaskInfo { private GameObject obj; private Shader[] preMaterialShader; public bool isDestroy; #region get public GameObject GetObj() { return obj; } public Shader[] GetpreMaterialShader() { return preMaterialShader; } #endregion public CameraMaskInfo(GameObject obj) { this.obj = obj; } public void PutInTransparent() { int id = -1; for (int i = 0; i < CameraFollow.instance.OutTransparentList.Count; i++) { if (CameraFollow.instance.OutTransparentList[i].GetObj() == obj) { id = i; //如果在out里面有，那么说明该物体的shader已经被改变，只能从之前的获得 preMaterialShader = CameraFollow.instance.OutTransparentList[i].GetpreMaterialShader(); CameraFollow.instance.InTransparentList.Add(CameraFollow.instance.OutTransparentList[i]); CameraFollow.instance.OutTransparentList.RemoveAt(i); break; } } if (id==-1) { preMaterialShader = new Shader[obj.renderer.materials.Length]; for (int i = 0; i < obj.renderer.materials.Length; i++) { preMaterialShader[i] = obj.renderer.materials[i].shader; obj.renderer.materials[i].shader = Shader.Find("Transparent/Diffuse"); } CameraFollow.instance.InTransparentList.Add(this); } } public void PutOutTransparent() { int id = -1; for (int i = 0; i < CameraFollow.instance.InTransparentList.Count; i++) { if (CameraFollow.instance.InTransparentList[i].GetObj() == obj) { id = i; CameraFollow.instance.OutTransparentList.Add(CameraFollow.instance.InTransparentList[i]); CameraFollow.instance.InTransparentList.RemoveAt(i); break; } } if (id == -1) { CameraFollow.instance.OutTransparentList.Add(this); } } public void Add() { for (int i = 0; i < obj.renderer.materials.Length; i++) { obj.renderer.materials[i].color = new Color(obj.renderer.materials[i].color.r, obj.renderer.materials[i].color.g, obj.renderer.materials[i].color.b, obj.renderer.materials[i].color.a + Time.deltaTime * 2f); } if (obj.renderer.materials[0].color.a >= 0.95f) { for (int i = 0; i < obj.renderer.materials.Length; i++) { obj.renderer.materials[i].color = new Color(obj.renderer.materials[i].color.r, obj.renderer.materials[i].color.g, obj.renderer.materials[i].color.b, 1f); } SetPreShader(); CameraFollow.instance.OutTransparentList.Remove(this); } } public void Sub() { for (int i = 0; i < obj.renderer.materials.Length; i++) { obj.renderer.materials[i].color = new Color(obj.renderer.materials[i].color.r, obj.renderer.materials[i].color.g, obj.renderer.materials[i].color.b, obj.renderer.materials[i].color.a - Time.deltaTime * 2f); } if (obj.renderer.materials[0].color.a <= 0.3f) { CameraFollow.instance.InTransparentList.Remove(this); } } private void SetPreShader() { for (int i = 0; i < obj.renderer.materials.Length; i++) { obj.renderer.materials[i].shader = preMaterialShader[i]; } }}
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效果：
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