常用的3d向量方法，根据《3d数学基础：图形与游戏开发》中第六章改写的c#版

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class Vector3    {        public float X { get; set; }        public float Y { get; set; }        public float Z { get; set; }        public Vector3() { }        public Vector3(float x, float y, float z) { this.X = x; this.Y = y; this.Z = z; }        public Vector3(Vector3 vec) { this.X = vec.X; this.Y = vec.Y; this.Z = vec.Z; }        #region 运算符重载        public static Vector3 operator +(Vector3 vec1, Vector3 vec2)        {            return new Vector3(vec1.X + vec2.X, vec1.Y + vec2.Y, vec1.Z + vec2.Z);        }        public static Vector3 operator -(Vector3 vec)        {            return new Vector3(-vec.X, -vec.Y, -vec.Z);        }        public static Vector3 operator -(Vector3 vec1, Vector3 vec2)        {            return new Vector3(vec1.X - vec2.X, vec1.Y - vec2.Y, vec1.Z - vec2.Z);        }        public static Vector3 operator *(Vector3 vec, float ratio)        {            return new Vector3(vec.X * ratio, vec.Y * ratio, vec.Z * ratio);        }        public static Vector3 operator *(float ratio, Vector3 vec)        {            return new Vector3(vec.X * ratio, vec.Y * ratio, vec.Z * ratio);        }        public static float operator *(Vector3 vec1, Vector3 vec2)        {            return vec1.X * vec2.X + vec1.Y * vec2.Y + vec1.Z * vec2.Z;        }        public static Vector3 operator /(Vector3 vec, float ratio)        {            if (ratio == 0)            {                Console.WriteLine("除数不能为0");                return null;            }            else            {                return new Vector3(vec.X / ratio, vec.Y / ratio, vec.Z / ratio);            }        }        public static bool operator ==(Vector3 vec1, Vector3 vec2)        {            return !(vec1 != vec2);        }        public static bool operator !=(Vector3 vec1, Vector3 vec2)        {            return vec1.X != vec2.X || vec1.Y != vec2.Y || vec1.Z != vec2.Z;        }        public override bool Equals(object obj)        {            if (obj == null)                return false;            else            {                if (obj.GetType() == GetType())                {                    Vector3 temp = (Vector3)obj;                    return this.X == temp.X && this.Y == temp.Y && this.Z == temp.Z;                }                else                {                    return false;                }            }        }        public override string ToString()        {            return string.Format("{0}，{1}，{2}", this.X, this.Y, this.Z);        }        public override int GetHashCode()        {            return base.GetHashCode();        }        #endregion        public Vector3 Normalize()        {            float magSq = X * X + Y * Y + Z * Z;            if (magSq > 0)            {                float oneOverMag = 1.0f / (float)Math.Sqrt(magSq);                float x = X * oneOverMag;                float y = Y * oneOverMag;                float z = Z * oneOverMag;                return new Vector3(x, y, z);            }            return new Vector3(0, 0, 0);        }        public float Length()        {            return (float)Math.Sqrt(X * X + Y * Y + Z * Z);        }        public static float Length(Vector3 vec)        {            return (float)Math.Sqrt(vec.X * vec.X + vec.Y * vec.Y + vec.Z * vec.Z);        }        public static Vector3 CrossProduct(Vector3 vec1, Vector3 vec2)        {            return new Vector3(                vec1.Y * vec2.Z - vec1.Z * vec2.Y,                vec1.Z * vec2.X - vec1.X * vec2.Z,                vec1.X * vec2.Y - vec1.Y * vec2.X                );        }        public static float Distance(Vector3 vec1, Vector3 vec2)        {            float dx = vec1.X - vec2.X;            float dy = vec1.Y - vec2.Y;            float dz = vec1.Z - vec2.Z;            return (float)Math.Sqrt(dx * dx + dy * dy + dz * dz);        }        public static Vector3 Zero()        {            return new Vector3(0, 0, 0);        }    }
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