diff --git a/source/engines/opengl_engine/formulas.cpp b/source/engines/opengl_engine/formulas.cpp
index 6265225..f3e5b5c 100644
--- a/source/engines/opengl_engine/formulas.cpp
+++ b/source/engines/opengl_engine/formulas.cpp
@@ -33,7 +33,7 @@ namespace omath::opengl_engine
     Mat4x4 RotationMatrix(const ViewAngles& angles)
     {
         return MatRotationAxisZ<float, MatStoreType::COLUMN_MAJOR>(angles.roll) *
-               MatRotationAxisY<float, MatStoreType::COLUMN_MAJOR>(angles.yaw) *
+               MatRotationAxisY<float, MatStoreType::COLUMN_MAJOR>(-angles.yaw) *
                MatRotationAxisX<float, MatStoreType::COLUMN_MAJOR>(-angles.pitch);
     }
     Mat4x4 CalcPerspectiveProjectionMatrix(const float fieldOfView, const float aspectRatio, const float near,
diff --git a/tests/engines/unit_test_iw_engine.cpp b/tests/engines/unit_test_iw_engine.cpp
index 679af03..86b7d0b 100644
--- a/tests/engines/unit_test_iw_engine.cpp
+++ b/tests/engines/unit_test_iw_engine.cpp
@@ -27,6 +27,42 @@ TEST(UnitTestIwEngine, UpVector)
     EXPECT_EQ(up, omath::iw_engine::kAbsUp);
 }
 
+TEST(UnitTestIwEngine, ForwardVectorRotationYaw)
+{
+    omath::iw_engine::ViewAngles angles;
+
+    angles.yaw = omath::iw_engine::YawAngle::FromDegrees(-90.f);
+
+    const auto forward = omath::iw_engine::ForwardVector(angles);
+    EXPECT_NEAR(forward.x, omath::iw_engine::kAbsRight.x, 0.00001f);
+    EXPECT_NEAR(forward.y, omath::iw_engine::kAbsRight.y, 0.00001f);
+    EXPECT_NEAR(forward.z, omath::iw_engine::kAbsRight.z, 0.00001f);
+}
+
+TEST(UnitTestIwEngine, ForwardVectorRotationPitch)
+{
+    omath::iw_engine::ViewAngles angles;
+
+    angles.pitch = omath::iw_engine::PitchAngle::FromDegrees(-89.f);
+
+    const auto forward = omath::iw_engine::ForwardVector(angles);
+    EXPECT_NEAR(forward.x, omath::iw_engine::kAbsUp.x, 0.02f);
+    EXPECT_NEAR(forward.y, omath::iw_engine::kAbsUp.y, 0.01f);
+    EXPECT_NEAR(forward.z, omath::iw_engine::kAbsUp.z, 0.01f);
+}
+
+TEST(UnitTestIwEngine, ForwardVectorRotationRoll)
+{
+    omath::iw_engine::ViewAngles angles;
+
+    angles.roll = omath::iw_engine::RollAngle::FromDegrees(90.f);
+
+    const auto forward = omath::iw_engine::UpVector(angles);
+    EXPECT_NEAR(forward.x, omath::iw_engine::kAbsRight.x, 0.00001f);
+    EXPECT_NEAR(forward.y, omath::iw_engine::kAbsRight.y, 0.00001f);
+    EXPECT_NEAR(forward.z, omath::iw_engine::kAbsRight.z, 0.00001f);
+}
+
 TEST(UnitTestIwEngine, ProjectTargetMovedFromCamera)
 {
     constexpr auto fov = omath::projection::FieldOfView::FromDegrees(90.f);
diff --git a/tests/engines/unit_test_open_gl.cpp b/tests/engines/unit_test_open_gl.cpp
index cab6465..170b306 100644
--- a/tests/engines/unit_test_open_gl.cpp
+++ b/tests/engines/unit_test_open_gl.cpp
@@ -10,20 +10,12 @@
 TEST(UnitTestOpenGL, ForwardVector)
 {
     const auto forward = omath::opengl_engine::ForwardVector({});
-    omath::opengl_engine::ViewAngles angles = {};
-    angles.pitch = omath::opengl_engine::PitchAngle::FromDegrees(90);
-
-    std::print("{}\n", angles.pitch.AsDegrees());
-    const auto forward2 = omath::opengl_engine::ForwardVector(angles);
-
-    std::println("OpenGL {} {} {}", std::round(forward2.x), std::round(forward2.y), std::round(forward2.z));
     EXPECT_EQ(forward, omath::opengl_engine::kAbsForward);
 }
 
 TEST(UnitTestOpenGL, RightVector)
 {
     const auto right = omath::opengl_engine::RightVector({});
-
     EXPECT_EQ(right, omath::opengl_engine::kAbsRight);
 }
 
@@ -33,6 +25,44 @@ TEST(UnitTestOpenGL, UpVector)
     EXPECT_EQ(up, omath::opengl_engine::kAbsUp);
 }
 
+TEST(UnitTestOpenGL, ForwardVectorRotationYaw)
+{
+    omath::opengl_engine::ViewAngles angles;
+
+    angles.yaw = omath::opengl_engine::YawAngle::FromDegrees(90.f);
+
+    const auto forward = omath::opengl_engine::ForwardVector(angles);
+    EXPECT_NEAR(forward.x, omath::opengl_engine::kAbsRight.x, 0.00001f);
+    EXPECT_NEAR(forward.y, omath::opengl_engine::kAbsRight.y, 0.00001f);
+    EXPECT_NEAR(forward.z, omath::opengl_engine::kAbsRight.z, 0.00001f);
+}
+
+
+
+TEST(UnitTestOpenGL, ForwardVectorRotationPitch)
+{
+    omath::opengl_engine::ViewAngles angles;
+
+    angles.pitch = omath::opengl_engine::PitchAngle::FromDegrees(-90.f);
+
+    const auto forward = omath::opengl_engine::ForwardVector(angles);
+    EXPECT_NEAR(forward.x, omath::opengl_engine::kAbsUp.x, 0.00001f);
+    EXPECT_NEAR(forward.y, omath::opengl_engine::kAbsUp.y, 0.00001f);
+    EXPECT_NEAR(forward.z, omath::opengl_engine::kAbsUp.z, 0.00001f);
+}
+
+TEST(UnitTestOpenGL, ForwardVectorRotationRoll)
+{
+    omath::opengl_engine::ViewAngles angles;
+
+    angles.roll = omath::opengl_engine::RollAngle::FromDegrees(-90.f);
+
+    const auto forward = omath::opengl_engine::UpVector(angles);
+    EXPECT_NEAR(forward.x, omath::opengl_engine::kAbsRight.x, 0.00001f);
+    EXPECT_NEAR(forward.y, omath::opengl_engine::kAbsRight.y, 0.00001f);
+    EXPECT_NEAR(forward.z, omath::opengl_engine::kAbsRight.z, 0.00001f);
+}
+
 TEST(UnitTestOpenGL, ProjectTargetMovedFromCamera)
 {
     constexpr auto fov = omath::projection::FieldOfView::FromDegrees(90.f);