calculate normal matrix once in cpp (performance),

added bool variable to turn light on/off (still needs button),

QtMeshViewer/Header/OglViewerWidget.h

@@ -38,7 +38,7 @@ private:
 	} m_rotDirections;
 
 	struct {
-		QVector3D position = { 1,1,1 };
+		QVector3D position = { 10,10,10 };
 		QVector3D intensities = { 1,0.25,0.25 };
 	} m_light;
 
@@ -50,6 +50,7 @@ private:
 	QQuaternion m_rotation;
 
 	bool m_wireframe = false;
+	bool m_lightOn = true;
 
 protected:
 	void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;