The frame ids point to the files found in index 0 or 1, idr(osrs cache only, fuck 317s). Those files will link to a skeleton which contains the bodyparts information. The player models have weights attached to them which group the body parts together, helping build the skeleton. The frames themselves will contain information about where a specific body part is every frame - the coordinates in a local 3d box, in addition to a few other bits of information such as transparency.





