added trace line

tests/CMakeLists.txt

@@ -13,7 +13,9 @@ add_executable(unit-tests
         UnitTestVector3.cpp
         UnitTestVector2.cpp
         UnitTestColor.cpp
-        UnitTestVector4.cpp)
+        UnitTestVector4.cpp
+        UnitTestLineTrace.cpp
+)
 
 target_link_libraries(unit-tests PRIVATE gtest gtest_main omath)
 

tests/UnitTestLineTrace.cpp

@@ -0,0 +1,67 @@
+#include "gtest/gtest.h"
+#include "omath/collision/LineTracer.hpp"
+#include "omath/Triangle3d.hpp"
+#include "omath/Vector3.hpp"
+
+using namespace omath;
+using namespace omath::collision;
+
+class LineTracerTest : public ::testing::Test
+{
+protected:
+    // Set up common variables for use in each test
+    Vector3 vertex1{0.0f, 0.0f, 0.0f};
+    Vector3 vertex2{1.0f, 0.0f, 0.0f};
+    Vector3 vertex3{0.0f, 1.0f, 0.0f};
+    Triangle3d triangle{vertex1, vertex2, vertex3};
+};
+
+// Test that a ray intersecting the triangle returns false for CanTraceLine
+TEST_F(LineTracerTest, RayIntersectsTriangle)
+{
+    constexpr Ray ray{{0.3f, 0.3f, -1.0f}, {0.3f, 0.3f, 1.0f}};
+    EXPECT_FALSE(LineTracer::CanTraceLine(ray, triangle));
+}
+
+// Test that a ray parallel to the triangle plane returns true for CanTraceLine
+TEST_F(LineTracerTest, RayParallelToTriangle)
+{
+    constexpr Ray ray{{0.3f, 0.3f, 1.0f}, {0.3f, 0.3f, 2.0f}};
+    EXPECT_TRUE(LineTracer::CanTraceLine(ray, triangle));
+}
+
+// Test that a ray starting inside the triangle but pointing away returns true
+TEST_F(LineTracerTest, RayStartsInTriangleButDoesNotIntersect)
+{
+    constexpr Ray ray{{0.3f, 0.3f, 0.0f}, {0.3f, 0.3f, -1.0f}};
+    EXPECT_TRUE(LineTracer::CanTraceLine(ray, triangle));
+}
+
+// Test that a ray not intersecting the triangle plane returns true
+TEST_F(LineTracerTest, RayMissesTriangle)
+{
+    constexpr Ray ray{{2.0f, 2.0f, -1.0f}, {2.0f, 2.0f, 1.0f}};
+    EXPECT_TRUE(LineTracer::CanTraceLine(ray, triangle));
+}
+
+// Test that a ray lying exactly in the plane of the triangle without intersecting returns true
+TEST_F(LineTracerTest, RayInPlaneNotIntersecting)
+{
+    constexpr Ray ray{{-1.0f, -1.0f, 0.0f}, {1.5f, 1.5f, 0.0f}};
+    EXPECT_TRUE(LineTracer::CanTraceLine(ray, triangle));
+}
+
+// Test edge case where the ray exactly intersects one of the triangle's vertices, expecting false
+TEST_F(LineTracerTest, RayIntersectsVertex)
+{
+    const Ray ray{{-1.0f, -1.0f, -1.0f}, vertex1}; // Intersecting at vertex1
+    EXPECT_FALSE(LineTracer::CanTraceLine(ray, triangle));
+}
+
+// Test edge case where the ray exactly intersects one of the triangle's edges, expecting false
+TEST_F(LineTracerTest, RayIntersectsEdge)
+{
+    constexpr Ray ray{{-1.0f, 0.0f, -1.0f}, {0.5f, 0.0f, 0.0f}};
+    // Intersecting on the edge between vertex1 and vertex2
+    EXPECT_FALSE(LineTracer::CanTraceLine(ray, triangle));
+}