unity3D剪裁

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分类： Unity3D

实现效果拖动readplane 当包围盒最小点超出bluePlane的最小点时（仅做了左边裁剪），对超出部分裁剪，当全部超出隐藏readPlane 当readPlane包围盒的最大坐标点大于bluePlane的最小点时，显示readPlane；

阅读此文时，读者最好具备世界坐标本地坐标 bounds 等之类的知识！
collider.bounds、render.bounds的min max是世界坐标，size是大小 mesh.bounds是本地坐标。mesh.vertices对线框顶点坐标更改。

 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);        }    }

最终效果图：

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