FBX ASCII 7300 (2013) File Format

• Each Object Type requires unique id number (uid) < 2**63 
• Each closing brace must be on its own line
• For Vertices, PolygonVertexIndex, Materials arrays need number of elements in array e.g. Vertices *(number of vertices  x 3) { 
• Negative polygon vertex index created by bitwise not of actual vertex index
• https://banexdevblog.wordpress.com/2014/06/23/a-quick-tutorial-about-the-fbx-ascii-format/
• https://github.com/mont29/blender-io-fbx/blob/master/io_scene_fbx/export_fbx_bin.py