Unity用相机实现的镜子效果

首先登场

场景中的元素
在这里插入图片描述
mirror是镜子，挂着我们的脚本，Quad是一个面片。Camera是用来生成RenderTexture给面片的。里面的test1是我用来调试位置的球。

镜子size是大小，x是-2，为了反转一下贴图

在这里插入图片描述
相机直接可以禁用掉，用脚本来调用。

玩家就是一个胶囊，里面的eye位置把玩家视角的相机放上去，其他没什么特别的。

代码的原理就是把相机拍摄到的图给Quad的Texture，脚本根据人物的位置来改变位置，并计算近裁面，这里因为有旋转，所以镜子后面最好不要有东西，否则相机会拍摄到，或者用层来避免拍摄到的问题。

附上代码：


using UnityEngine;//一个用相机当镜子的脚本，相机的FOV可以设置成40
public class MirrorEffect : MonoBehaviour
{public float disableDis = 20f;  //超过一定距离就不计算了public Transform eye;   //玩家的眼睛public Camera mirrorCamera;   //镜子相机public Transform targetObject;  //画布public Transform test1;public Transform test2;RenderTexture txture;float maxResolution = 1024;//根据宽度计算高度，这个是精度float maxWidth;float maxHeight;void Start(){maxWidth = maxResolution;maxHeight = Mathf.Abs(targetObject.localScale.y / targetObject.localScale.x * maxWidth);txture = new RenderTexture((int)maxWidth, (int)maxHeight, 24);Renderer rend = targetObject.GetComponent<Renderer>();if (rend == null){Debug.LogWarning("MirrorEffect找不到Renderer.");return;}mirrorCamera.enabled = false;rend.material.mainTexture = txture;mirrorCamera.targetTexture = txture;}private void Update(){Comput();}private void OnDestroy(){DestroyImmediate(txture, true);}void Comput(){float dis = Vector3.Distance(eye.transform.position, transform.position);if (dis > disableDis){return;}//计算视口高度和宽度float frustumHeight = targetObject.transform.localScale.y;//float frustumWidth = frustumHeight * mainCamera.aspect;//缩放目标面片物体大小//targetObject.transform.localScale = new Vector3(frustumWidth, frustumHeight, 1f);float distance = frustumHeight * 0.5f / Mathf.Tan(mirrorCamera.fieldOfView * 0.5f * Mathf.Deg2Rad);//镜子左右边的位置float sz = Mathf.Abs(targetObject.transform.localScale.x);Vector3 v3l = new Vector3(sz * -0.5f, 0f, 0f);Vector3 v3r = new Vector3(sz * 0.5f, 0f, 0f);v3l = transform.TransformPoint(v3l);v3r = transform.TransformPoint(v3r);//test1.position = v3l;//test2.position = v3r;//计算相机在镜子对象的局部坐标//计算反射位置Vector3 dir1 = (v3l - eye.transform.position).normalized;Vector3 dir2 = (v3r - eye.transform.position).normalized;Vector3 mirDir = -(dir1 + dir2).normalized;Vector3 dirref2 = Vector3.Reflect(mirDir, -transform.forward);//Debug.DrawRay(transform.position, dirref, Color.yellow, 1f);//Debug.DrawRay(transform.position, dirref2, Color.red,1f);//相机位于镜子正后方,要保持相机所有平移要水平与镜子Vector3 dirref3 = Vector3.ProjectOnPlane(dirref2, transform.up);Debug.DrawRay(transform.position, dirref3, Color.green, 1f);Vector3 cameraPlace = transform.position + dirref3.normalized * distance;mirrorCamera.transform.position = cameraPlace;// new Vector3(at2.x, 0f, distance);mirrorCamera.nearClipPlane = distance;Quaternion q = Quaternion.LookRotation((targetObject.transform.position - mirrorCamera.transform.position).normalized);mirrorCamera.transform.rotation = q;mirrorCamera.Render();}
}