🧪 [Add tests for Vec3::dot]

tests/test_math.cpp

@@ -1,4 +1,5 @@
 #include "soft_render/math/vec4.hpp"
+#include "soft_render/math/vec3.hpp"
 #include <iostream>
 #include <cassert>
 #include <cmath>
@@ -51,8 +52,63 @@ void test_vec4_perspective() {
     std::cout << "test_vec4_perspective passed!" << std::endl;
 }
 
+
+void test_vec3_dot() {
+    std::cout << "Running test_vec3_dot..." << std::endl;
+
+    // Case 1: Orthogonal vectors (dot product = 0)
+    {
+        Vec3 v1(1.0f, 0.0f, 0.0f);
+        Vec3 v2(0.0f, 1.0f, 0.0f);
+        assert(std::abs(v1.dot(v2)) < 1e-6f);
+        std::cout << "  Orthogonal vectors passed" << std::endl;
+    }
+
+    // Case 2: Parallel vectors (dot product = length1 * length2)
+    {
+        Vec3 v1(2.0f, 0.0f, 0.0f);
+        Vec3 v2(3.0f, 0.0f, 0.0f);
+        assert(std::abs(v1.dot(v2) - 6.0f) < 1e-6f);
+        std::cout << "  Parallel vectors passed" << std::endl;
+    }
+
+    // Case 3: Anti-parallel vectors
+    {
+        Vec3 v1(2.0f, 0.0f, 0.0f);
+        Vec3 v2(-3.0f, 0.0f, 0.0f);
+        assert(std::abs(v1.dot(v2) - (-6.0f)) < 1e-6f);
+        std::cout << "  Anti-parallel vectors passed" << std::endl;
+    }
+
+    // Case 4: Vector with itself (dot product = length squared)
+    {
+        Vec3 v(1.0f, 2.0f, 3.0f);
+        assert(std::abs(v.dot(v) - 14.0f) < 1e-6f);
+        std::cout << "  Vector with itself passed" << std::endl;
+    }
+
+    // Case 5: Zero vector
+    {
+        Vec3 v1(0.0f, 0.0f, 0.0f);
+        Vec3 v2(1.0f, 2.0f, 3.0f);
+        assert(std::abs(v1.dot(v2)) < 1e-6f);
+        std::cout << "  Zero vector passed" << std::endl;
+    }
+
+    // Case 6: Mixed components
+    {
+        Vec3 v1(1.0f, 2.0f, 3.0f);
+        Vec3 v2(4.0f, -5.0f, 6.0f);
+        assert(std::abs(v1.dot(v2) - 12.0f) < 1e-6f); // 4 - 10 + 18 = 12
+        std::cout << "  Mixed components passed" << std::endl;
+    }
+
+    std::cout << "test_vec3_dot passed!" << std::endl;
+}
+
 int main() {
     test_vec4_perspective();
+    test_vec3_dot();
     std::cout << "All tests passed!" << std::endl;
     return 0;
 }