Banjo-Kazooie uses animation files comprised of a list of Internal Bone IDs, their transformation type (scale, rotate or translate), and across which frames of an animation these transformations occur. Animation indices can be found in the Rom Map.

The file header is 0x8 bytes in length and details the start and end frames of the animation as well as the amount of elements impacting the various bones of a model.

Example (60f0.bin, Banjo's Backflip at address 0x0):

00 0F 00 A5 00 48 00 00

Loads an animation beginning at frame 15 (0x0F) and ending at frame 165 (0xA5) with 72 (0x48) elements across those frames.

The element header establishes that an internal bone ID is affected, which transform type* is occurring, and how many times that bone transforms between the start and end frames. Element headers are 0x4 bytes. Each Internal Bone ID may have more than one element corresponding to a separate transformation type of that bone. An element header only exists before the transform section for its respective bone ID and a new one is generated when all transforms for data count [cc cc] have been written.

Example (60f0.bin, Banjo's Backflip at address 0x08):

00 10 00 09

This element targets Internal Bone ID 1 (0x1), rotates the bone around the X axis (0x0), and does this at 9 (0x9) different points between frames 15 and 165.

The transform structure details the frames in which a transformation of the bone occurs and by how much the bone moves between frames with respect to the scale of the model (transform factor). Transform structure is repeated for instances [cc cc] before introducing the next element header where [cc cc] = Data Count. The first two bytes of data contain two bits representing unknown values and fourteen bits which determine the frame of a transformation.

*Bitwise Parameters:

[xx xx] ⇒ [DE FF FF FF FF FF FF FF]

So data for each transform structure can best be represented like this:

Example (60f0.bin, Banjo's Backflip at address 0x0C):

C0 0F 15 E6

At frame 15 (0xF), two bitwise parameters are set as true (if [d] = 1 and [e] = 1, then the remaining two bits must return false to equal 0xC) and then the bone transforms by a factor of 87.59375 (0x15E6).