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Unity在Mesh更新的时候会增加内存，一般的方法是使用数组去填入。
Vector3[] vertices = new Vector3[segmentCount * 4];
Vector3[] normals = new Vector3[segmentCount * 4];
Vector4[] tangents = new Vector4[segmentCount * 4];
Color[] colors = new Color[segmentCount * 4];
Vector2[] uvs = new Vector2[segmentCount * 4];
int[] triangles = new int[segmentCount * 6];
mesh.vertices = vertices;
mesh.normals = normals;
mesh.tangents = tangents;
mesh.triangles = triangles;
mesh.colors = colors;
mesh.uv = uvs;这样子既要每次申请内存，操作起来也不很方便。
之后在一个帖子上看到
http://answers.unity3d.com/questions/1102650/avoiding-gc-when-rebuilding-meshuv-and-meshvertice.html
其实可以用list
这样只要一开始申请足够内存就不需要一直申请了。
private List<Vector3> _vertices = new List<Vector3>(1024);
private List<Vector3> _normals = new List<Vector3>(1024);
private List<Vector4> _tangents = new List<Vector4>(1024);
private List<Color> _colors = new List<Color>(1024);
private List<Vector2> _uvs = new List<Vector2>(1024);
private List<int> _triangles = new List<int>(1024);
mesh.SetVertices(_vertices);
mesh.SetNormals(_normals);
mesh.SetTangents(_tangents);
mesh.SetTriangles(_triangles,0);
mesh.SetColors(_colors);
mesh.SetUVs(0,_uvs);