Animation collections are used for character animations on bikes. Each bike's VEH_*_AT.BIN bundle contains one animation collection.

Structures

Hmmm...

To do:
In-game testing has not yet been conducted. It is required to understand the data. Many field descriptions are currently guesswork.

Offset	Length	Type	Name	Description	Comments
0x0	0x2	uint16_t	?	Version number	1
0x2	0x2	uint16_t	?	Number of animations	Always 32
0x4	0x4	uint32_t	?	Resource size
0x8	0x4	?**	?	Animation data	See animation
0xC	0x4	?*	?	Joint data	See joint data

Offset	Length	Type	Name	Description	Comments
0x0	0x2	uint16_t	?	Version number	1
0x2	0x2	uint16_t	?	Number of animations	Always 32
0x4	0x4	uint32_t	?	Resource size
0x8	0x8	?**	?	Animation data	See animation
0x10	0x8	?*	?	Joint data	See joint data

Because the pointers in this structure are only set at runtime, the data is read sequentially after the end of the structure in the following order:

Offset	Length	Type	Name	Description	Comments
0x0	0x4	uint32_t	?	Number of keyframes
0x4	0x4	uint32_t	?	Number of joints	Always 45
0x8	0x4	uint32_t	?	Packed joint data size
0xC	0x4	uint32_t	?	Combined size of all joint data for one keyframe	Equal to packed joint data size * number of joints
0x10	0x4	uint32_t	?	Matrix data size
0x14	0x4	uint32_t	?	Total size of this structure
0x18	0x4	uint32_t	?		Always 1
0x1C	0x4	float	?	Animation rate	Keyframes per second
0x20	0x4	uint32_t	?		0, 5 or 10 in samples. No bearing on data?
0x24	0x4	Vector4*	?	Positions	Set at runtime
0x28	0x4	Matrix44*	?	Movement?	Set at runtime
0x2C	0x4	uint32_t*	?	Packed joint data	Coordinates? Movement changes? Set at runtime

Offset	Length	Type	Name	Description	Comments
0x0	0x4	uint32_t	?	Number of keyframes
0x4	0x4	uint32_t	?	Number of joints	Always 45
0x8	0x4	uint32_t	?	Packed joint data size
0xC	0x4	uint32_t	?	Combined size of all joint data for one keyframe	Equal to packed joint data size * number of joints
0x10	0x4	uint32_t	?	Matrix data size
0x14	0x4	uint32_t	?	Total size of this structure
0x18	0x4	uint32_t	?		Always 1
0x1C	0x4	float	?	Animation rate	Keyframes per second
0x20	0x4	uint32_t	?		0, 5 or 10. No bearing on data?
0x24	0x4			Padding
0x28	0x8	Vector4*	?	Positions	Set at runtime
0x30	0x8	Matrix44*	?	Movement?	Set at runtime
0x38	0x8	uint32_t*	?	Packed joint data	Coordinates? Movement changes? Set at runtime

Because the pointers in this structure are only set at runtime, the data is read sequentially after the end of the structure in the following order:

Offset	Length	Type	Name	Description	Comments
0x0	0x4	?*	?	Joint info	See joint info Set at runtime
0x4	0x4	uint32_t*	?	Special indices	Always matches the following: Right ankle Left ankle Right wrist Left wrist Set at runtime
0x8	0x4	CgsID*	?	Joint IDs	Examples include MAN_HIPS, MANL_FEMUR_J, and MANR_WRIST_J. "MANL" and "MANR" refer to the left and right sides of the character. "_J" indicates a joint. Set at runtime
0xC	0x2	uint16_t	?	Number of joints	Always 45
0xE	0x2	uint16_t	?	Number of special indices	Always 4

Offset	Length	Type	Name	Description	Comments
0x0	0x8	?*	?	Joint info	See joint info Set at runtime
0x8	0x8	uint32_t*	?	Special indices	Always matches the following: Right ankle Left ankle Right wrist Left wrist Set at runtime
0x10	0x8	CgsID*	?	Joint IDs	Examples include MAN_HIPS, MANL_FEMUR_J, and MANR_WRIST_J. "MANL" and "MANR" refer to the left and right sides of the character. "_J" indicates a joint. Set at runtime
0x18	0x2	uint16_t	?	Number of joints	Always 45
0x1A	0x2	uint16_t	?	Number of special indices	Always 4
0x1C	0x4			Padding

Offset	Length	Type	Name	Description	Comments
0x0	0x10	Vector4	?	Initial position?
0x10	0x10	uint32_t[4]	?	Connecting joint indices?	-1 if no connection