| inVertices | Per-vertex positions. | 
新しい頂点位置の配列を割り当てます
See Also: vertices property.
| inVertices | Per-vertex positions. | 
| start | Index of the first element to take from the input array. | 
| length | Number of elements to take from the input array. | 
| flags | Flags controlling the function behavior, see MeshUpdateFlags. | 
Sets the vertex positions of the Mesh, using a part of the input array.
        This method behaves as if you called SetVertices with an array that is a slice of the whole array, starting at start index and being of a given length. The resulting Mesh has length amount of vertices.