From 7aa2a67d8381c9a88d69a3f53d74a7f079214263 Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Mon, 9 Mar 2026 21:49:43 +0800
Subject: Establish a well-structured modern C++ project architecture Focus on
 code quality: Treat strict warnings as errors, memory checks with Sanitizers,
 Clang formatting and static analysis Performance optimization: LTO, ccache

---
 src/vec3.h | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 src/vec3.h

(limited to 'src/vec3.h')

diff --git a/src/vec3.h b/src/vec3.h
new file mode 100644
index 0000000..56490bc
--- /dev/null
+++ b/src/vec3.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2026 Richard
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#ifndef VEC_3
+#define VEC_3
+
+#include <array>
+#include <cmath>
+#include <iostream>
+
+class vec3{
+  public:
+    std::array<double, 3> e;
+
+    vec3() : e{0, 0, 0} {}
+    vec3(double e0, double e1, double e2) : e{e0, e1, e2} {}
+
+    double x() const;
+    double y() const;
+    double z() const;
+
+    vec3 operator-() const;
+    double operator[](int i) const;
+    double &operator[](int i);
+    vec3& operator+=(const vec3 & other);
+    vec3& operator*=(double t);
+    vec3& operator/=(double t);
+    double length() const;
+    double length_squared() const;
+
+
+};
+
+inline std::ostream &operator<<(std::ostream &out, const vec3 &v);
+inline vec3 operator+(const vec3 &u, const vec3 &v);
+inline vec3 operator-(const vec3 &u, const vec3 &v);
+inline vec3 operator*(const vec3 &u, const vec3 &v);
+inline vec3 operator*(double t, const vec3 &v);
+inline vec3 operator*(const vec3 &v, double t);
+inline vec3 operator/(const vec3 &v, double t);
+inline double dot(const vec3 &u, const vec3 &v);
+inline vec3 cross(const vec3 &u, const vec3 &v);
+inline vec3 unit_vector(const vec3 &v);
+
+#endif
-- 
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