【拓展类方法】

以下是一些给类增加方法的示例：

using UnityEngine;
public static class ExtensionMethods
{
    public static Vector3 Round(this Vector3 v)
    {
        v.x = Mathf.Round(v.x);
        v.y = Mathf.Round(v.y);
        v.z = Mathf.Round(v.z);
        return v;
    }

    public static Vector3 Round(this Vector3 v,float size)
    {
        return (v/size).Round() * size;
    }

    public static float Round(this float v,float size) {
        return Mathf.Round(v / size) * size;
    }

    public static float AtLeast(this float val, float min) {
        return Mathf.Max(val,min);
    }

    public static int AtLeast(this int val, int min) {
        return Mathf.Max(val,min);
    }
    
}