- `vcg`: this is the core of the library, where all the algorithms and data structures are defined. This part is pure, quite heavily templated, C++ code with STL support for common data structures and algorithms. You will not find a single include from here to anything else than standard libraries. Note that core part is made of header files (.h files) only.
- `wrap`: here you will find the wrapping of VCG concepts towards specific needs/contexts/libraries. For example you will find all the code to import/export meshes from the hard disk in many formats, or the routines for rendering triangle meshes with OpenGL, supports for common GUI tools like a trackball, and so on..
- `apps`: this folder contains the command line applications developed with the VCG Lib. Many (much more) examples can be found in MeshLab. The apps/sample directory contains a sub-collection of very basic apps. A good starting point for beginners!
- `eigenlib` a copy of the latest stable version of the eigen library for linear algebra ( http://http://eigen.tuxfamily.org/ ). VCGlib relies on eigen for all the advanced matrix processing.