💡 Normal maps simulate small surface details without adding geometry. But DirectX and OpenGL handle the Y-axis differently: 👉 DirectX Normal Maps: Y-axispoints down Typically use left-handed coordinate system Green areas on the normal map might look darker. 👉 OpenGL Normal Maps: Y-axispoints up Uses a right-handed coordinate system Green areas usually appear lighter. 🎯 Why it matters: If you use the wrong format in your engine or shader, lighting will look off—like bumps are inverted. You can fix this by inverting the green channel if needed. #normal #maps #you #know #difference