思路为修改模型材质球的Tiling参数，根据与自身localScale的值得到合适的比例，再修改Tiling值

var mat = target.transform.GetComponent<Renderer>().material;
var oriValue = mat.mainTextureScale;//沿着Y轴伸缩
oriValue.y = 1 * target.transform.localScale.y;
mat.mainTextureScale = oriValue;