P3D File Format - ODOLV7

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General

Legend

see Generic FileFormat Data Types


CompressedStructures

(potentially) compressed arrays are endemic to most blocks contained in a p3d.

CompressedStruct
{
	ulong	Count;
	<type>	Array[Count];
};

if Count * sizeof(<type>) exceeds 1023 bytes the array is compressed. The resulting array will be expanded using lzh compression exactly as found in pbo's (for instance)

After decompression, the Count remains the same because it is a count of the arraytype.

For uncompressed arrays (byte count < 1024) the Count and data are treated 'as is'.


Thus for various Array <types>

  • ulong Array: > 255 // 1024 / sizeof(ulong)
  • float thing[2]: > 127 // 1024 / 2*sizeof(float)
  • SomeStructure: > // count * sizeof (SomeStructure) > 1023


Note that potentially compressed arrays in these structures only have an known output length. the decompressor therefore must work on infinite input length.


Odol7Stuct

See P3D Model Info.

ODOLV7
{
	StandardP3DHeader	Header;
	LodStruct			Lods[Header.LodCount];
	ModelInfo			ModelInfo;
};


StandardP3DHeader

StandardP3DHeader
{
	char	Signature[4];	//"ODOL" (vs MLOD eg)
	ulong	Version;		// 7
	ulong	LodCount;		// at least one
}


LodStruct

See:


LodStruct
{
	VertexTable		VertexTable;
	float			UnknownFloat1;
	float			UnknownFloat2;
	XYZTriplet		MinPos;
	XYZTriplet		MaxPos;
	XYZTriplet		AutoCenterPos;
	float			UnknownFloat3;
	Textures		Textures;
	LodEdges		LodEdges;
	ulong			NoOfFaces;
	ulong			OffsetToLodSections;
	LodFace			LodFaces[NoOfFaces]; // ie polygons
	ulong			nSections;
	LODSection		LODSections[nSections];
	ulong			nNamedSelections;
	NamedSelection	NamedSelections[nNamedSelections];
	ulong			nTokens;
	NamedProperty	NamedProperties[nTokens];
	ulong			nFrames;
	Frame			Frames[nFrames];
	ulong			IconColor;
	ulong			SelectedColor;
	ulong			Unknown;
	ulong			nProxies;
	LodProxy		LodProxies[nProxies];
};

VertexTable

See P3D Point and Face Flags.

	struct
	{ 
	ulong		Count;
	ulong		PointFlags[Count];	// compressed
	ulong		Count;
	UVPair		UV1[Count];			// compressed 
	ulong		Count;
	XYZTriplet	Points[Count];		// UNcompressed
	ulong		Count;
	XYZTriplet	Normals[Count];		// UNcompressed
	}
  • Count is the same value for all four tables.

Textures

struct
{
ulong	Count;
asciiz	Textures[...]; // "data/1.paa\0data/2.paa\0"...
}

Count corresponds to the number of concatenated strings. It is required, since, architecturally at least, one of more of the asciiz strings could be null.

NamedProperty

struct
{
	Asciiz Property; // e.g "noshadow" = "1"
	Asciiz Value;
}


Related Page(s)

LZ in ODOL

see Compressed LZSS File Format

Model File Formats