From 9631e860c50c2123b96d1a44ce241eb7002b8414 Mon Sep 17 00:00:00 2001
From: Skittles <dragonfly2046@dungeon.rip>
Date: Sun, 14 Jun 2026 13:18:11 -0700
Subject: [PATCH] Simple Ray class

---
 src/core/CMakeLists.txt |  6 +++++-
 src/core/Ray.cpp        | 12 ++++++++++++
 src/core/Ray.hpp        | 26 ++++++++++++++++++++++++++
 3 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 src/core/Ray.cpp
 create mode 100644 src/core/Ray.hpp

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 687d971..adcf63d 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -3,8 +3,12 @@ set(target project_core)
 add_library(${target}
     core.cpp
     core.hpp
+    Ray.cpp
+    Ray.hpp
 )
 
 target_compile_features(${target} PRIVATE cxx_std_23)
 
-# target_link_libraries(${target} PRIVATE)
\ No newline at end of file
+target_include_directories(${target} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+
+target_link_libraries(${target} PUBLIC Eigen3::Eigen)
\ No newline at end of file
diff --git a/src/core/Ray.cpp b/src/core/Ray.cpp
new file mode 100644
index 0000000..a48c936
--- /dev/null
+++ b/src/core/Ray.cpp
@@ -0,0 +1,12 @@
+#include "Ray.hpp"
+
+core::Ray::Ray(const Eigen::Vector3d &origin, const Eigen::Vector3d &direction)
+    : origin_(origin), direction_(direction) {}
+
+const Eigen::Vector3d &core::Ray::origin() const { return origin_; }
+
+const Eigen::Vector3d &core::Ray::direction() const { return direction_; }
+
+Eigen::Vector3d core::Ray::pointAt(const double t) const {
+  return origin_ + (t * direction_);
+}
diff --git a/src/core/Ray.hpp b/src/core/Ray.hpp
new file mode 100644
index 0000000..c3424ff
--- /dev/null
+++ b/src/core/Ray.hpp
@@ -0,0 +1,26 @@
+#ifndef RAY_HPP
+#define RAY_HPP
+
+#include <Eigen/Dense>
+
+namespace core {
+
+class Ray {
+public:
+  Ray(const Eigen::Vector3d &origin, const Eigen::Vector3d &direction);
+  ~Ray() = default;
+
+  const Eigen::Vector3d &origin() const;
+
+  const Eigen::Vector3d &direction() const;
+
+  Eigen::Vector3d pointAt(const double t) const;
+
+private:
+  Eigen::Vector3d origin_;
+  Eigen::Vector3d direction_;
+};
+
+} // namespace core
+
+#endif