diff --git a/graphics/vector3d.h b/graphics/vector3d.h
index ec23d659449..81508120e24 100644
--- a/graphics/vector3d.h
+++ b/graphics/vector3d.h
@@ -110,6 +110,14 @@ public:
 			return yaw;
 	}
 
+	void normalize() {
+		float len = sqrt(dotProduct(x(), y(), z()));
+		if (len != 0.0f) {
+			float t = 1.0f / len;
+			set(x() * t, y() * t, y() * t);
+		}
+	}
+
 	float dotProduct(float sx, float sy, float sz) {
 		return x() * sx + y() * sy + z() * sz;
 	}