# Part I. Core

This is the program itself without the interface. Basically V_Sim allows the user to see in a pseudo 3D representation a list of elements known by their positions in space, all contained in a box. And it gives tools to rotate, zoom and retrieve informations on positions, angles and distances. The program is supposed to be modular and the programer can add new functions "easily".

There are three sections. The first section deals with all the main functions to handle with this modularity, with the 3D drawing... The second section gathers all the extensions that have been added to improve V_Sim in the rendering area. The third section deals with the different possibilities that exist for the user to render different kind of elements.