3D model format

Stores 3D models, more investigation needed.

Current analysis: https://docs.google.com/spreadsheets/d/1Hk_EIYk2E6hVd747JJmC9pqqqh_dVafM3dqOkeRp3No/edit?usp=sharing

Thanks to Martin for initial format reversing.

• Magic - PMD V1.83
  • some files use version 1.82 instead, but they aren't used by the game, the engine in PC version won't recognise anything other than 1.83
  • There is one unused mention of PMD V1.71 in the game binary

Offset	Size	Description
0x0	0x18?	Magic - PMD V1.83
0x18	0x4	Type - 0 = shadow & skybox; 1 = track; 2 = car
0x1C	0x4	Zeroes?
0x20	0x94?	offsetsTable
0xB4	0x94?	offsetsTable sizes

offsetsTable

You have to add 0x148 to each value to get proper pointers

Bold IDs are in all files, rest of them are specific for tracks

Some of these are either unused or possibly repurposed

All blocks seems to be 32-bit alignedIf the offset/size address is empty it's always set to zero

ID	offset	size offset	Description
0	0x20	0xb4	Martin think it might be some sort of colider
1	0x24	0xb8	polygons data?
2	0x28	0xbc	UV texture data?
3	0x2c	0xc0	vertex data?
4	0x30	0xc4	faces data?
5	0x34	0xc8	Textures names
6	0x38	0xcc	Offsets to texture names, absolute addresses in file
7	0x3c	0xd0	Each element is 16B long, ?, ?, float, float
8	0x40	0xd4	Holds IDs of elements in 7
9	0x44	0xd8	surface transforms data?
10	0x48	0xdc	surfaces data?
11	0x4c	0xe0	LOD data, maybe something more
12		0xe4	for non-tracks it's size of 1 divided by 16, unknown for tracks
13	0x54	0xe8
14	0x58		for tracks offset marks end of file
15	0x5c	0xf0
16	0x60	0xf4
17	0x64	0xf8
18		0xfc	stores size of 20 divided by 0x90
19		0x100
20	0x70	0x104
21	0x74	0x108	List of points, looks like AI curve
22	0x78	0x10c
23	0x7c	0x110
24	0x80	0x114
25	0x84	0x118
26	0x88	0x11c
27	0x8c	0x120
28	0x90	0x124
29	0x94	0x128
30	0x98	0x12c
31	0x9c	0x130
32	0xa0	0x134
33
34
35
36

Block 11

I'm skipping most of this block, as it's unused or used directly by the engine to store some of the calculated addresses

If the number of LODs is set to less than 3, later ones just copy id from previous ones

Offset	Type	Description
0x0	short	Same as file type at 0x18
0x2	short	Unknown, always set to 1 for normal files, 2 for tracks and 4 for cars
0x1C	float	Always 1.0
0x20	byte	unknown
0x21	byte	unknown
0x22	short	unknown
0x24	int	number of meshes (surfaces) for each LOD
0x48	int	ID of first mesh for LOD 0
0x4c	int	ID of first mesh for LOD 1
0x50	int	ID of first mesh for LOD 2
0x54	int	ID of first mesh for LOD 3
0x58	int	Number of additional LODs, can be 0-3

Basic elements

Vertex

Offset	Type	Description
0x0	float	X
0x4	float	Y
0x8	float	Z
0xC	float	unknown, might be weight

Polygon

Offset	Type	Description
0x0	byte	X
0x1	byte	Y
0x2	byte	Z
0x3	byte	unknown, might be weight
0x4	short	vertices index?
0x6	short	face table start index

UV mapping

Offset	Type	Description
0x0	float	X
0x4	float	Y
0x8	short	vertex index
0x10	short	unknown, might be texture index
0x12	int	normal vector?

Face

Offset	Type	Description
0x0	short	index ?

Transform

Offset	Type	Description
0x0	float[4][4]	some kind of matrix
0x40	int[4] ?	unknown four ints?

Surface

Probably not surface, Martin used that name in his script, but it feels more like a singular mesh by the look of binary file itself

Offset	Type	Description
0x0	short[4]	unknown
0x8	short	transform index?
0xA	short[3]	unknown
0x10	int[3]	unknown
0x1C	float	weight?
0x20	short	unknown (index?)
0x22	short	unknown (index?)
0x24	short	polys count
0x26	short	UVs count
0x28	int	vertices count
0x2C	int	UVs start index
0x30	int	vertices start index
0x34	int	polys start index
0x38	int[2]	unknown