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• 最好是凸边形；
• 给定点按顺时针方向排列；
• 固定一个点，这也保证了凸边形不会有错；

private GameObject CreateMesh(List
   
     lists, Transform area, Material mat){
       int iVertexCount = lists.Count;    int iTrsCount = lists.Count - 2;    //int iTimer = 0;        GameObject meshObj = new GameObject("mesh");    meshObj.transform.SetParent(area);    MeshFilter filter = meshObj.AddComponent
    
     ();    MeshRenderer renderer = meshObj.AddComponent
     
      ();    renderer.material = mat;        int[] newTriangles = new int[3 * iTrsCount];    for (int i = 0; i < iTrsCount; i++)    {
           newTriangles[3 * i] = 0;//固定第一个点            newTriangles[3 * i + 1] = i + 1;        newTriangles[3 * i + 2] = i + 2;    }    Vector3[] newVertices = new Vector3[iVertexCount];    for (int i = 0; i < iVertexCount; i++)    {
           var pos = new Vector3(lists[i].x, lists[i].y, 0);        newVertices[i] = pos;    }    var mesh = filter.mesh;    mesh.vertices = newVertices;    mesh.triangles = newTriangles;    return meshObj;}
     
    
   

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