Unity 使用this关键字进行函数拓展 - Vector3

using UnityEngine;
using System.Collections.Generic;

namespace SK.Framework
{
    /// 
    /// 三维向量相关拓展
    /// 
    public static class Vector3Extension 
    {
        /// 
        /// 将xyz值放入一个长度为3的float数组中
        /// 
        /// 三维向量
        /// float数组
        public static float[] ToArray(this Vector3 self)
        {
            float[] retArray = new float[3];
            retArray[0] = self.x;
            retArray[1] = self.y;
            retArray[2] = self.z;
            return retArray;
        }
        /// 
        /// 转四元数
        /// 
        /// 三维向量
        /// 四元数
        public static Quaternion ToQuaternion(this Vector3 self)
        {
            return Quaternion.Euler(self);
        }
        /// 
        /// 获取最小值
        /// 
        /// 三维向量列表
        /// 最小值
        /// 三维向量列表
        public static List GetMin(this List self, out Vector3 min)
        {
            min = self[0];
            for (int i = 1; i < self.Count; i++)
            {
                min = Vector3.Min(min, self[i]);
            }
            return self;
        }
        /// 
        /// 获取最大值
        /// 
        /// 三维向量列表
        /// 最大值
        /// 三维向量列表
        public static List GetMax(this List self, out Vector3 max)
        {
            max = self[0];
            for (int i = 1; i < self.Count; i++)
            {
                max = Vector3.Max(max, self[i]);
            }
            return self;
        }
        /// 
        /// 计算角度-叉乘
        /// 
        /// 三维向量
        /// 目标三维向量
        /// 角度值
        public static float GetAngle(this Vector3 self, Vector3 target)
        {
            return Mathf.Acos(Vector3.Dot(self.normalized, target.normalized)) * Mathf.Rad2Deg;
        }
        /// 
        /// 生成多边形Mesh网格
        /// 
        /// 多边形顶点数组
        /// 网格
        public static Mesh GenerateMesh(this Vector3[] self) 
        {
            Mesh retMesh = new Mesh();
            List triangles = new List();
            for (int i = 0; i < self.Length - 1; i++)
            {
                triangles.Add(i);
                triangles.Add(i + 1);
                triangles.Add(self.Length - i - 1);
            }
            retMesh.vertices = self;
            retMesh.triangles = triangles.ToArray();
            retMesh.RecalculateBounds();
            retMesh.RecalculateNormals();
            return retMesh;
        }
        /// 
        /// 生成贝塞尔曲线
        /// 
        /// 控制点
        /// 贝塞尔曲线起点
        /// 贝塞尔曲线终点
        /// 贝塞尔曲线点个数
        /// 组成贝塞尔曲线的点集合
        public static Vector3[] GenerateBeizer(this Vector3 self, Vector3 startPoint, Vector3 endPoint, int count)
        {
            Vector3[] retValue = new Vector3[count];
            for (int i = 1; i  height || self.y < -height) return false;
            var comparePoint = (points[0] + points[1]) * 0.5f;
            comparePoint += (comparePoint - self).normalized * 10000;
            int count = 0;
            for (int i = 0; i < points.Length; i++)
            {
                var a = points[i % points.Length];
                var b = points[(i + 1) % points.Length];
                var crossA = Mathf.Sign(Vector3.Cross(comparePoint - self, a - self).y);
                var crossB = Mathf.Sign(Vector3.Cross(comparePoint - self, b - self).y);
                if (Mathf.Approximately(crossA, crossB)) continue;
                var crossC = Mathf.Sign(Vector3.Cross(b - a, self - a).y);
                var crossD = Mathf.Sign(Vector3.Cross(b - a, comparePoint - a).y);
                if (Mathf.Approximately(crossC, crossD)) continue;
                count++;
            }
            return count % 2 == 1;
        }
        /// 
        /// 获取点坐标数组
        /// 
        /// 点列表
        /// 点坐标数组
        public static Vector3[] GetPositions(this List self)
        {
            Vector3[] retArray = new Vector3[self.Count];
            for (int i = 0; i < self.Count; i++)
            {
                retArray[i] = self[i].position;
            }
            return retArray;
        }
        /// 
        /// 获取点坐标数组
        /// 
        /// 点数组
        /// 点坐标数组
        public static Vector3[] GetPositions(this Transform[] self)
        {
            Vector3[] retArray = new Vector3[self.Length];
            for (int i = 0; i < self.Length; i++)
            {
                retArray[i] = self[i].position;
            }
            return retArray;
        }
    }
}