Layout (Version 0x17)

Offset	Name	Type	Value	Notes
0x00	Version number	uint	0x17
0x04	Loaded state	int	0x00
0x08	File size (bytes)	int
0x0C	Body Part count	byte
0x0D	Wheel count	byte
0x0E	Minimum LOD	short
0x10	Maximum LOD	short
0x14	Object radius	float
0x18	Wheel radius	float
0x1C	Wheel scales	float[6]
0x34	Body part radii	float[6]
0x4C	LOD database offsets	LOD Database*[5]
0x60	Vehicle texture offset	Texture*
0x64	Shadow body object offset	Vehicle Object*
0x68	Shadow wheel object offset	Vehicle Object*
0x6C	Texture colour overlay offset	Texture*
0x70	Chassis bone deform matrices	Matrix3x4[20]
0x570	Chassis skin-to-bone deform matrices	Matrix3x4[20]
0xA70	Chassis bone lengths	float[20]
0xAC0	Chassis bone rig type	EBoneRigType		0x00 = normal bone rig 0x01 = large bone rig 0x02 = no bone rig
0xAC4	Body part types	EBodyPartType[6]		0x00 = Wheel 0x01 = Body part
0xADC	Hinge axes	byte[6]
0xAE2	Body part bone indices	byte[6][2]
0xAEE	Wheel bone indices	byte[6][2]
0xAFC	Hinge max angles	float[6]
0xB14	Body part bone weights	float[6][2]
0xB44	Wheel bone weights	float[6][2]
0xB80	Wheel matrices	Matrix3x4[6]
0xD00	Body part matrices	Matrix3x4[6]
0xEA0	Body part attach points	Vector3[6]
0x1060	Hull	Vehicle Hull
0x1660	Hull exists?	Bool32
0x1664	Tag points	Tag Point*[18]
0x16AC	Tag point counts	byte[18]
0x16C8	Number of payload sets	sbyte
0x16C9	Number of payloads	sbyte
0x16CA	Current payload set	sbyte	-1 if not set
0x16DC	ESM offsets	Engine Sound Model*[2]

LOD Database

The LOD Database format stores a given vehicle's LOD model.

LODs, or Levels of Detail, are lower-poly, lower-detail (hence the name) models that games use for objects that are far away from the player, to keep framerates smooth. BGVs contain 4 LOD Databases, which in turn each contain one LOD model of minimum (LOD 3), low (LOD 2), medium (LOD 1) and high (LOD 0) quality.

It seems a LOD Database can contain a maximum of 12 vehicle objects, though it's unknown if this rule is enforced by the game or if it can be larger than that.

Offset	Name	Type
0x00	Body object offset	Vehicle Object*
0x04	Body part offsets	Vehicle Object*[5]
0x18	Wheel object offsets	Vehicle Object*[4]

Vehicle Object

Offset	Name	Type	Description
0x00	Mesh count	sbyte
0x01	Glass mesh index	sbyte
0x04	Mesh array offset	Vehicle Mesh*[]	Pointer to an array of Vehicle Meshes
0x08	Normal shift	float

Vehicle Mesh

The format for a Vehicle Mesh definition differs by platform.

PS2

Offset	Name	Type
0x00	Render data (first)	byte*
0x04	Render data (rest)	byte*
0x08	Mesh flags	ushort
0x0A	Alpha1	byte
0x0B	Texture index	byte
0x0C	Source opacity	byte
0x0D	Current opacity	byte
0x0E	Shininess	byte
0x0F	Unused	byte

Xbox

Offset	Name	Type
0x00	unk0	float
0x04	unk1	float
0x08	unk2	float
0x0C	Render Data	byte*
0x10	Render Data Size	int
0x14	unk3	int
0x18	unk4	byte
0x19	unk5	byte
0x1A	unk6	byte
0x1B	unk7	byte

Engine Sound Model

This format contains playback parameters and pitching info for a given vehicle's engine sound effects, stored mostly as floating-point numbers. BGVs use two of these files for high and low speed ranges. The files were merged into the BGV starting with revision 0x17; prior to this, they were stored externally in the same folder as the BGV, with the file extensions .HSM and .LSM.