@@ -181,10 +181,21 @@
 	_values[15] = matrix->_values[3] * copy[12] +
 	    matrix->_values[7] * copy[13] +
 	    matrix->_values[11] * copy[14] +
 	    matrix->_values[15] * copy[15];
 }
+
+- (OFVector3D)transformedVector3D: (OFVector3D)vector
+{
+	return OFMakeVector3D(
+	    _values[0] * vector.x + _values[4] * vector.y +
+	    _values[8] * vector.z,
+	    _values[1] * vector.x + _values[5] * vector.y +
+	    _values[9] * vector.z,
+	    _values[2] * vector.x + _values[6] * vector.y +
+	    _values[10] * vector.z);
+}
 
 - (OFString *)description
 {
 	return [OFString stringWithFormat:
 	    @"<OFMatrix4x4: {\n"