OBJ Loader

A basic model, such as from an OBJ file, will have:

• Vertex data - XYZ positions
• Polygon data - list of vertices
• Color data - per polygon or per vertex

For an OBJ model, we store:

• List of vertex positions - indexed by number
• List of materials (colors) - indexed by name
• List of drawing commands - "usemtl" or "f"