I agree that skeleton system is not very hard to implement. Anecdotally, one of the first CL based apps I wrote were to implement Quake MD5 (.md5mesh and .md5an

I agree that skeleton system is not very hard to implement. Anecdotally, one of the first CL based apps I wrote were to implement Quake MD5 (.md5mesh and .md5anim) parsers to do skeletal animation. I think he might be categorising it as hard for the following: - Defining a simple, easy to navigate data structure with the bone and weight mappings across vertices, to do the math for pose calculation - Having a highly compressed binary format for animation data, which is definitely hard but required for good FPS - Doing it on CPU or GPU