Native VTK and GADGET extensions serve as a tutorial for writing IFrIT extensions. The tutorial comes in 3 levels: Beginner, Intermediate, and Advanced and is incorporated into the source code.

The Beginner tutorial starts with the file core/vtkextension.h; the header contains the next step in the tutorial. When browsing through the source files, always read the implementation file (.cpp) after a header file.

These two extensions can also be used as templates for creating new ones.

If there is a demand, I will write a formal Guide for Writing Extensions.

Beginner Tutorial:

• core/vtkextension.h
• core/vtkextension.cpp
• core/vtkdatasubjects.h
• core/vtkdatasubjects.cpp
• core/vtkfileloader.h
• core/vtkfileloader.cpp
• core/vtkdatareaderextension.h
• core/vtkdatareaderextension.cpp
• shells/generic/vtkggextension.h
• shells/generic/vtkggextension.cpp

Intermediate Tutorial:

• core/vtkfileloader2.cpp
• core/vtkdatareaderextension2.cpp
• shells/generic/vtkggextension2.cpp

Advanced Tutorial:

• core/gextension.h
• core/gextension.cpp
• core/gdatasubjects.h
• core/gdatasubjects.cpp
• core/gfileloader.h
• core/gfileloader.cpp
• core/gdatareaderextension.h
• core/gdatareaderextension.cpp
• shells/generic/gggextension.h
• shells/generic/gggextension.cpp
• shells/generic/gggpagedata.h
• shells/generic/gggpagedata.cpp