1_Data Structure

Each model is created by following this sequence:

Model Header --> Mesh Struct --> Polygon 1 Header --> Vertex 1 Struct --> Polygon 2 Header --> Vertex 2 Struct...

After the Mesh struct, when following for the length specified in the Mesh struct specified in 0x4c, the mesh has reached its ending point. The very next thing to follow will then be either:

• a new Mesh Struct, with its Polygon Headers and Vertex Structs as usual

OR

• Model End Struct

Face-Generation

Face building formula is based on incremental vertex sequence: (0, 1, 2) (1, 2, 3) (2, 3, 4)...

Model Header

Address	Length	Description
0x00	0x18	Model header
0x00	0x04	Naomi globalflag0, values: 0 = pure beta / 1 = super index / -1 NULL
0x04	0x04	Naomi globalflag1, (Check the Table )
0x08	0x04	Centroid of object, X Coordinate (Float)
0x0C	0x04	Centroid of object, Y Coordinate (Float)
0x10	0x04	Centroid of object, Z Coordinate (Float)
0x14	0x04	Bounding radius of object (Float)

Mesh Struct

Address	Length	Description
0x00	0x50	Mesh Instructions
0x00	0x04	Mesh Parameter (Check the Table )
0x04	0x04	Image Synth & Shading Proc.
0x08	0x04	Texture & Shading Proc.
0x08	0x01	Texture size + Shadows ON/OFF (bit flag) (Check the Table )
0x09	0x01	Texture filtering (bit flag) ( 04 = OFF / 24 = Bilinear / A4 = trilinear? )
0x0A	0x01	U/V Flip + Clamp (bit flag) (Check the Table )
0x0B	0x01	SRC/DST Alpha Blending mode (Check the Table )
0x0C	0x04	Texture Control (bit flag) (Check the Table )
0x0F	0x01	Texture color format (RGB1555/ARGB1555/RGB565/RGB4444/ARGB4444)
0x10	0x04	Centroid of mesh, X Coordinate (Float)
0x14	0x04	Centroid of mesh, Y Coordinate (Float)
0x18	0x04	Centroid of mesh, Z Coordinate (Float)
0x1C	0x04	Bounding radius of mesh (Float)
0x20	0x01	Texture number (in PVR archive or mem offset)
0x24	0x04	Specular light value (? bitflag )
0x28	0x04	Light value (Float -3.5 + 3.5)
0x2C	0x04	Transparency value (Float)
0x30	0x04	Vertex Color - RED (Float)
0x34	0x04	Vertex Color - GREEN (Float)
0x38	0x04	Vertex Color - BLUE (Float)
0x3C	0x04	Specular Transparency value (Float)
0x40	0x04	Specular Light - RED (Float)
0x44	0x04	Specular Light - GREEN (Float)
0x48	0x04	Specular Light - BLUE (Float)
0x4C	0x04	Total Mesh Vertex data length

Polygon Header

Address	Length	Description
0x00	0x08	Polygon Instructions
0x00	0x04	Polygon Type: (Check the Table )
0x04	0x04	Total verts ( Regular-Type ) or Total verts / 3 ( Triple-Type)

Type A Vertex Struct

Address	Length	Description
0x0	0x20	Vertex Type A
0x0	0x04	X (Float)
0x4	0x04	Y (Float)
0x8	0x04	Z (Float)
0xC	0x04	X Normal (Float)
0x10	0x04	Y Normal (Float)
0x14	0x04	Z Normal (Float)
0x18	0x04	U (Float)
0x1C	0x04	V (Float)

Type B Vertex Struct:

Type B acts as a pointer to an already used vertex.

Address	Length	Description
0x0	0x08	Vertex Type B
0x0	0x04	NaN value to detect Type B / Vertex Index Counter
0x4	0x04	Vertex Pointer

Vertex Offset Calculation:

VincentNL method (physical offset) by using vertex pointer at 0x4:

Vertex_Offset = Type_B_Offset - (0xFFFF FFF8 - Vertex_Pointer) (big endian)

Example:

Type_B_offset: 0x4B98 (big endian)

Data array:0x80E8 FF5F 00EA FFFF (little endian)

Vertex_Pointer: 0x00EA FFFF (little endian)

Calculation:

0x4B98 - ( 0xFFFF FFF8 - 0xFFFF EA00) = 0x35A0 (big endian)

Vertex offset at: 0x35A0

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Egregiousguy method (vertex index) by using vertex pointer at 0x0:

Every vertex is considered as a fixed value of 0x20. By subtracting 0x1000000 to vertex pointer, then dividing by 0x20, we know how many vertices back it is from Type_B_Offset.

Example:

Data array:0x80FE FF5F 0xA8FE FFFF (little endian)

Vertex_pointer: 0xFF FE80 (big endian)

Calculation:

(0x1000000 - 0xFFFE80) / 0x20 = 0xC (big endian)

Vertex offset is 12 (0xC) vertices back.

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Model End Struct:

Address	Length	Description
0x0	0x08	Model End
0x0	0x04	00 00 00 00
0x4	0x04	Total Vertex of model