First we need to create a directory for the help. Change into the NGL directory and type the following
Next in the root directory of NGL type doxygen (and ignore the warnings !)
This should generate all the html help files for doxygen. We now need to convert them into a format that Qt uses. This is done with the qhelpgenerator program which is located in /opt/qtsdk/qt/bin/qhelpgenerator
To use it we change to the $(HOME)/NGL/docs/html directory and run
This will create a file called index.qch which is loaded into Qt Creator, open up the preferences and locate the following tab
click on the add button and locate the NGL/docs/html/index.qch and add it.
re-start Qt Creator and you should be able to press F1 on any of the NGL:: classes and get the help as shown below