While trying to reverse Otto Matic, I found a unique file format for representing 3D models in the game. This file format isn't documented anywhere except for in Brian Greenstone's book and the accompanying source code. (BG3D = Brian Greenstone 3D.) This repository contains my tool for parsing the file and the lessons I learned about the format.
- The file format is made up of tags and data. The tags mark the beginning of sections of data for materials, textures, OpenGL vertex arrays, normal arrays, UV arrays, triangle arrays, etc.
- Each tag is 32 bits. Most other values in the file are also 32 bits, except for a few chars in the header.
- The PowerPC Macintosh computers for which the Pangea Software games and the BG3D file format were developed were big endian, so conversion is needed in the code.
- Later versions of bg3d, or at least the example models packaged with the book, have a slightly different format to the models packaged with Otto Matic.
- DONE Finish the tool for reporting all the information for every tag.
- DONE Make tool conform to the multiple bg3d versions seen so far.
- Make a tool for converting the BG3D files to an open, more supported file format.
- Maybe add tools for exporting the textures and meshes seperately.