added limited rotation,

2 directions do not work

QtMeshViewer/Header/OglViewerWidget.h

@@ -31,6 +31,12 @@ private:
 		QVector2D position;
 	} m_mouse;
 
+	struct {
+		bool x = true;
+		bool y = true;
+		bool z = true;
+	} m_rotDirections;
+
 	QOpenGLShaderProgram m_program;
 	GeometryEngine *m_dataEngine;