實現效果 拖動readplane 當包圍盒最小點超出bluePlane的最小點時（僅做了左邊裁剪），對超出部分裁剪，當全部超出隱藏readPlane 當readPlane包圍盒的最大坐標點大于bluePlane的最小點時，顯示readPlane；

閱讀此文時，讀者最好具備世界坐標 本地坐標 bounds 等之類的知識！
collider.bounds、render.bounds的min max是世界坐標，size是大小? mesh.bounds是本地坐標。mesh.vertices對線框頂點坐標更改。
???

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最左邊兩個點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)//包圍盒最小坐標x超出blue的最小坐標開始裁剪 {Vector3[] vec3=mesh.vertices;Vector3 vec3local=(readPlane.worldToLocalMatrix*new Vector3(readBoundPlane.min.x-blueBoundMin.x,0,0));//因為collider.bounds.min是世界坐標，mesh.vertices是本地坐標所以需要世界到本地的轉化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);}}

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???最終效果圖：

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轉載于:https://www.cnblogs.com/U-tansuo/archive/2012/07/11/2587151.html

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