//首先创建一个球体
GameObject obj = GameObject.CreatePrimitive(PrimitiveType.Sphere);
//设置球体的颜色(红色)
obj.GetComponent<Renderer>().material.color = Color.red;
//设置球体的大小
obj.transform.localScale = new Vector3(0.1f,0.1f,0.1f);
//旋转
obj.transform.Rotate(new Vector3(90f,0f,0f));