From e8ed68f3c70e80fd422de2cf2acc59a5f7641c93 Mon Sep 17 00:00:00 2001
From: josh <josh@stepbro.wtf>
Date: Thu, 7 Mar 2024 00:40:12 -0500
Subject: [PATCH] Implement(ing) Ray class

---
 include/J3ML/Geometry/Ray.h | 54 +++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/include/J3ML/Geometry/Ray.h b/include/J3ML/Geometry/Ray.h
index 053a7ed..414e159 100644
--- a/include/J3ML/Geometry/Ray.h
+++ b/include/J3ML/Geometry/Ray.h
@@ -5,13 +5,67 @@
 #pragma once
 
 #include <J3ML/LinearAlgebra/Vector3.h>
+#include <vector>
+#include "TriangleMesh.h"
+#include "Frustum.h"
+#include "OBB.h"
 
 namespace J3ML::Geometry
 {
     using LinearAlgebra::Vector3;
+
+
+    class Shape {};
+
+    // RaycastResult structure containing the first object the ray collides with,
+    // the surface intersection point,
+    // and the surface normal at the point of intersection.
+    struct RaycastResult
+    {
+        Vector3 Intersection;
+        Vector3 SurfaceNormal;
+        Shape Hit;
+    };
+
+    // A ray in 3D space is a line that starts from an origin point and extends to infinity in one direction
     class Ray
     {
+    public:
         Vector3 Origin;
+        // The normalized direction vector of this ray.
+        // @note: For proper functionality, this direction vector needs to always be normalized
         Vector3 Direction;
+        Ray() {}
+        Ray(const Vector3& pos, const Vector3& dir);
+        //explicit Ray(const Line& line);
+        explicit Ray(const LineSegment& lineSegment);
+        bool IsFinite() const;
+        Vector3 GetPoint(float distance) const;
+        RaycastResult Cast(const Triangle& target, float maxDistance = 99999999);
+        RaycastResult Cast(const Plane& target, float maxDistance = 99999999);
+        RaycastResult Cast(const AABB& target, float maxDistance = 99999999);
+        // https://gdbooks.gitbooks.io/3dcollisions/content/Chapter3/raycast_sphere.html
+        RaycastResult Cast(const Sphere& target, float maxDistance = 99999999)
+        {
+            Vector3 p0 = this->Origin;
+            Vector3 d = this->Direction.Normalize();
+
+            Vector3 c = target.Position;
+            float r = target.Radius;
+
+            Vector3 e = c - p0;
+            float Esq = Vector3::LengthSquared(e);
+            float a = Vector3::Dot(e, d);
+            
+        }
+        RaycastResult Cast(const OBB& target, float maxDistance = 99999999);
+        RaycastResult Cast(const Capsule& target, float maxDistance = 99999999);
+        RaycastResult Cast(const Frustum& target, float maxDistance = 99999999);
+        RaycastResult Cast(const TriangleMesh& target, float maxDistance = 9999999);
+
+        // Returns a RaycastResult structure containing the first object the ray collides with,
+        // the surface intersection point,
+        // and the surface normal at the point of intersection.
+        RaycastResult Cast(std::vector<Shape> shapes, float maxDistance = 99999999);
     };
 }
\ No newline at end of file