This chapter should be read by anyone who thinks that any of main conceptions of IVCON is wrong. If you like the way this tool is written, and you don't want to change scene data structure or object relations, you don't need to read this section.
Format libraries are two (or more) methods written in separate file.
Format libraries (tds.cpp,obj.cpp,...) are not separate objects,
because it is easier and quicker to write two functions (one for
reading and one for writing) than to create a new object.
There are no benefits for making each converter a separate object, it only enlarges the code and makes it unclear. It takes shorter to get familiar with the code when it is not fully object oriented.
All scene information are stored separately in IVCON class, so there is not "Scene" object.
This tool is intended to work with only one scene, so there are no reasons to close scene elements in object. This way makes accessing scene elements shorter and easier.
There is no per-face material or texture mapping, only per-vertex.
It took many days of discussion before this conception was accepted.
The main reason is to avoid programmer errors. This way is really best one. If a format uses per-face material mapping, the IVCON class contains proper functions to convert the mappings in both ways.
There is no color list array, specific objects contain their own color entries.
In many formats, there is a list of colors of vertices and lines.
In IVCON, colors are not on separate list, but inside specific lines or vertices. The class contains proper functions to copy colors from a list into each objects property and vice versa.