From a75acfabd16070fa112bf2966ecaf4449d0ec1ab Mon Sep 17 00:00:00 2001
From: "HuYingzhuo(hugo/hyzboy)" <hyzboy@gmail.com>
Date: Mon, 4 Sep 2023 21:56:26 +0800
Subject: [PATCH] improved "ray_intersection_angle" functions.

---
 inc/hgl/math/Vector.h | 43 ++++++++++++++++++++++++++++++++++++-------
 1 file changed, 36 insertions(+), 7 deletions(-)

diff --git a/inc/hgl/math/Vector.h b/inc/hgl/math/Vector.h
index c4d13ed..763b90e 100644
--- a/inc/hgl/math/Vector.h
+++ b/inc/hgl/math/Vector.h
@@ -262,18 +262,47 @@ namespace hgl
         return length_squared(v1,v2)<=(gap*gap);
     }
 
-    inline float ray_angle_cos(const Vector3f &ray_dir, const Vector3f &ray_pos, const Vector3f &pos)
+    /**
+    * 计算射线与点的夹角(cos)
+    */
+    inline float ray_intersection_angle_cos(const Vector3f &ray_dir, const Vector3f &ray_pos, const Vector3f &pos)
     {
         return dot(ray_dir, normalized(pos - ray_pos));
     }
 
     /**
-        * 做一个2D旋转计算
-        * @param result 结果
-        * @param source 原始点坐标
-        * @param center 圆心坐标
-        * @param ang 旋转角度
-        */
+    * 计算射线与点的夹角(弧度)
+    */
+    inline float ray_intersection_angle_radian(const Vector3f &ray_dir, const Vector3f &ray_pos, const Vector3f &pos)
+    {
+        double val=dot(ray_dir, normalized(pos - ray_pos));
+
+        if(val>1)return 0;
+        if(val<-1)return HGL_PI;
+    
+        return acos(val);
+    }
+
+    /**
+     * 计算射线与点的夹角(角度)
+     */
+    inline float ray_intersection_angle_degree(const Vector3f &ray_dir, const Vector3f &ray_pos, const Vector3f &pos)
+    {
+        double val=dot(ray_dir, normalized(pos - ray_pos));
+
+        if(val>1)return 0;
+        if(val<-1)return 180;
+    
+        return rad2deg(acos(val));
+    }
+
+    /**
+    * 做一个2D旋转计算
+    * @param result 结果
+    * @param source 原始点坐标
+    * @param center 圆心坐标
+    * @param ang 旋转角度
+    */
     template<typename T1, typename T2, typename T3>
     inline void rotate2d(T1 &result, const T2 &source, const T3 &center, const double ang)
     {