AMS (File Format)

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AMS (Aqualead MeSh) is a file format developed by Aqualead and found in some Wii and 3DS games (and suspected to be used in GameCube titles as well), such as One Piece: Unlimited Adventure, One Piece: Unlimited Cruise Episode 1 - The Treasure Beneath The Waves, One Piece: Unlimited Cruise Episode 2: Awakening of a Hero, One Piece: Unlimited Cruise SP and One Piece: Unlimited Cruise SP 2.

File Format

The file byte order can be either big endian (Wii) or little endian (3DS).

Header

The file starts with the following header:

Offset	Type	Description
0x00	Char[4]	File magic. Always ALMS in ASCII.
0x04	Byte	Unknown. Format type? Values seen are 2 and 8.
0x05	Byte	Unknown. Posibly bit flags, but files either use 0x80 or 0x81.
0x06	Byte	Unknown.
0x07	Byte	Unknown.
0x08	Byte	Unknown.
0x09	Byte	Number of bones (B).
0x0A	Byte	Unknown.
0x0B	Byte	Unknown.
0x0C	Float[2]	Unknown. Seems to be some kind of minimum values, perhaps for a 2D bounding box?
0x14	Float[2]	Unknown. Seems to be some kind of maximum values, perhaps for a 2D bounding box?
0x1C	UInt16	Section 1 offset.
0x1E	UInt16	Section 2 offset.
0x20	UInt16	Section 3 offset.
0x22	UInt16	Section 4 offset.

Section 1

This section defines material/shading data.

Section 2

This section defines the material's texture reference.

Section 3

This section defines B 0x30 bone entries.

Bone

Offset	Type	Description
0x00	float[3]	XYZ position.
0x0C	Char[4]	Bone name. Hardcoded to be 4 characters long.
0x10	float[4]	Rotation, using quaternions.
0x20	float[4]	Unknown.

Section 4

This section defines model data.

Tools

The following tools can handle AMS files:

• (none)