public Transform readPlane;public Transform bluePlane;Bounds readBoundPlane;Bounds blueBoundPlane;Vector3 blueBoundMin;Vector3 blueBoundMax;Mesh mesh;void Start(){mesh=readPlane.GetComponent<MeshFilter>().mesh;Vector3[] ve=mesh.vertices;print(ve[1]+"\\"+ve[3]);//readPlane最左边两个点blueBoundPlane=bluePlane.gameObject.collider.bounds;blueBoundMin=blueBoundPlane.min;blueBoundMax=blueBoundPlane.max;print(blueBoundMin+"||||"+blueBoundMax+"|||"+blueBoundPlane.size+"|||||"+blueBoundPlane.center);}void Update(){if(Input.GetMouseButton(0)){readBoundPlane=readPlane.GetComponent<BoxCollider>().bounds;if(readBoundPlane.min.x<blueBoundMin.x)//包围盒最小坐标x超出blue的最小坐标开始裁剪
            {Vector3[] vec3=mesh.vertices;Vector3 vec3local=(readPlane.worldToLocalMatrix*new Vector3(readBoundPlane.min.x-blueBoundMin.x,0,0));//因为collider.bounds.min是世界坐标，mesh.vertices是本地坐标所以需要世界到本地的转化vec3[1]=new Vector3(mesh.bounds.min.x-vec3local.x,vec3[1].y,vec3[1].z);vec3[3]=new Vector3(mesh.bounds.min.x-vec3local.x,vec3[3].y,vec3[3].z);Vector2[] uvs=new Vector2[vec3.Length];for(int i=0;i<vec3.Length;i++){if(i%2!=0){uvs[i]=new Vector2(((readBoundPlane.min.x-blueBoundMin.x)+readBoundPlane.size.x)/readBoundPlane.size.x,mesh.uv[i].y);//更新UV
                    }else{uvs[i]=new Vector2(mesh.uv[i].x,mesh.uv[i].y);}}mesh.uv=uvs;mesh.vertices=vec3;}if(readBoundPlane.max.x<=blueBoundMin.x){readPlane.GetComponent<MeshRenderer>().enabled=false;}if(readBoundPlane.max.x>blueBoundMin.x){readPlane.GetComponent<MeshRenderer>().enabled=true;}float x=Input.GetAxis("Mouse X");float y=Input.GetAxis("Mouse Y");readPlane.position+=new  Vector3(x,y,0);}}