Formats/SSXTricky:MPF(PS2 Model)

Overview

An MPF file contains model names, bones, UV maps, normals, vertices and other model data.

Here is the structure made in programming languages for easy code implementation:

- [SSX Tricky mpf C# handler by GlitcherOG](https://github.com/GlitcherOG/SSX-PS2-Collection-Modder/blob/main/FileHandlers/Models/TrickyMPFModelHandler.cs)

- [SSX Tricky mpf GO struct by Erick](https://github.com/Erickson400/TheTrickyModels/blob/main/mpf/MpfStructure.go)

Structure

File Header

Section 0 - Bytes[12]


Type	Description
Byte[4]	Unknown (Possibly version or magic)
UInt16	Model Header Count
UInt16	Offset To Model Headers
UInt32	Offset To Model Data List Start

Model Header

All Offsets Within the file are relative to the start of the Model Data

Type	Description
Bytes[16]	Name of Model (ASCII string with a max length of 16 bytes)
UInt32	Offset to Model Data which is relative to Model Data List Start Offset
UInt32	Size of model in bytes
UInt32	Offset of Bone Data List
UInt32	Offset of IK Point List
UInt32	Offset of Mesh Group Offset
UInt32	Offset of Mesh Data
UInt32	Offset Of Material Data
UInt32	Offset of Weight List Reference
UInt32	Offset of Bone Weights
UInt32	Unknown (Unused/Filler)
UInt32	Unknown (Unused/Filler)
UInt16	Num of Bone Weights
UInt16	Num of Weight List Refrence
UInt16	Num Of Mesh Groups
UInt16	Num Of Bone Data
UInt16	Num Of Materials
UInt16	Num Of IK Points
UInt16	Num Of Morph Keys
UInt16	Internal File ID. This is used in conjunction with weights so that it can access bones within another file
UInt32	Filler/Padding

Model Data

All Offsets Unless Stated Otherwise are relative to the start of model data

Material Data

Unused Slots use 0x00202020 as a place holder

Type	Description
Bytes[4]	Name of Main Texture map/file
Bytes[4]	Name/Type of Texture (Unused In PS2)
Bytes[4]	Name/Type of Texture (Unused In PS2)
Bytes[4]	Name/Type of Texture (Unused In PS2)
Bytes[4]	Name/Type of Texture (Unused In PS2)
Float32	Unknown float value
Float32	Unknown float value
Float32	Unknown float value

Bone Data

Location and Rotation are relative to parent

Type	Description
Bytes[16]	Name of Bone (ASCII string with a maximum length of 16 bytes)
UInt16	Internal File ID of Parent Bone(First bone always has 0xFFFF)
UInt16	ID of Parent Bone (First bone always has 0xFFFF)
UInt16	Bone ID (?)
UInt16	Unknown
Vector 3 (3 Float32s)	XYZ Position Of the Bone
Vector 3 (3 Float32s)	XYZ Radian Rotation of the bone
Vector 3 (3 Float32s)	XYZ Radian 2
6 Float32s	6 Floats either being -1 or 1

IK Points

Type	Description
Vector 3 (3 Float32s)	Location XYZ
UInt32	Unknown (Filler)

Group Main

Group Main Header

Type	Description
UInt32	Group Type (1 Standard, 17 Shadow, 256 Morph)
UInt32	Material ID
UInt32	Unknown (Always -1)
UInt32	Sub Group Offset
UInt32	Sub Group Count

Sub Group

Type	Description
UInt32	Mesh Group Offset
UInt32	Mesh Group Count

Mesh/Morph Data Group

Each one of these in order references a Weight Reference and all points within it will use that weight reference

Type	Description
UInt32	Model Offset
UInt32	Morph Target Offset Relative to Model Offset
UInt32	Morph Target Entry Size

Bone Weight

Bone Weight Header

Type	Description
UInt32	Length of array/list
UInt32	Offset to Bone weight list
UInt32	Unknown (Always 36)

Bone Weight

Type	Description
UInt16	Bone weight (0 to 100)
UInt16	Bone ID
UInt16	Bone Internal File ID

Weight List Ref

Type	Description
UInt32	Weight Reference Count
UInt32	Weight Reference Offset
Int32 List	WeightIDs

Mesh Data

The mesh data within the mpf can be very complex and is chunked meaning there can be multiple data chunks within a Mesh/Morph Data Group

Depending on the group type (Located in the mesh group) can effect what information is in here.

If Group Type is Standard there will be UV/Weight Block, Normal Block and, Vertex Block.
If Group Type is Shadow There will be Shadow Vertex Block
If Group Type is Morph the data will be the same as standard however there will be no data chunking

Bytes[48] Unimportant Data for Exporting

Type	Description
UInt32	Strip Count
UInt32	Unknown1
UInt32	Unknown2 (If group type is shadow this will be 0)
UInt32	Vertex Count

Tristrip Data

Type	Description
UInt32	Count of vertices
Bytes[12]	Padding

UV/Weight Block

Type	Description
Bytes[16]	Header of UV Block (Hex: 00100000 00100000 00000020 50505050)
Bytes[12]	Unknown
Byte	Unknown
Byte	Prefix List Start (0x80)
Byte	Count of UVs
Byte	Suffix of UV count (0x6D)
List of UV value	List Of UV/Weights Values

UV value

Type	Description
UInt16	UV map U (X translation) (In order to get the float value you do Number / 4096)
UInt16	UV map V (Y translation) (In order to get the float value you do Number / 4096)
UInt16	Bone Weight Ref ID (In order to get ID you do (Number - 14)/4)
Uint16	Bone Weight Ref ID (In order to get ID you do ???)

Normal Block

Type	Description
Bytes[16]	Header of normal Block (Hex: 00000000 00800000 00000020 40404040)
Bytes[12]	Unknown
Byte	Unknown
Byte	Prefix List Start (0x80)
Byte	Count of Normals
Byte	Suffix of Normal count (??)
List of Vector 3 (3 Int16s)	List of normals (In order to get the float value you do Number / 4096(???))

Vertex Block

Type	Description
Bytes[16]	Header of Vertex Block (Hex: 00000000 0000803F 00000020 40404040)
Bytes[12]	Unknown
Byte	Unknown
Byte	Prefix List Start (0x80)
Byte	Count of Vertices
Byte	Suffix of Vertex count (0x78)
List of Vector 3 (3 Float32)	List Of Vertex values

Shadow Vertex Block

Type	Description
Bytes[16]	Header of Vertex Block (Hex: 00000000 0000803F 00000020 40404040)
Bytes[12]	Unknown
Byte	Unknown
Byte	Prefix List Start (0x80)
Byte	Count of Vertices
Byte	Suffix of Vertex count (??)
List of Shadow Vertex	List Of Shadow Vertex values

Shadow Vertex value

Type	Description
Vector 3 (3 Float32)	Location XYZ
Uint16	Bone Weight Ref ID (In order to get ID you do (Number - 14)/4)