P3D File Format - ODOLV7: Difference between revisions

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= General =


===Legend===
see [[Generic FileFormat Data Types]]


===Intro===
== Legend ==


====CompressedStruct====
see [[Generic FileFormat Data Types]]
 
ODOL7 uses (potentially) compressed arrays.


This obviously slows the engine down during loading. At the time of CWC development, game file sizes were important.


(potentially) compressed arrays are contained in a CompressedStruct
== CompressedStructures ==


CompressedStructs are endemic to most blocks contained in the p3d.
(potentially) compressed arrays are endemic to most blocks contained in a p3d.
 
CompressedStruct
{
  ulong  Count;
  <type> Array[Count];
};


<syntaxhighlight lang="cpp">
CompressedStruct
{
ulong Count;
<type> Array[Count];
};
</syntaxhighlight>


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)
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 de-compression, the Count remains the same because it is a count of the arraytype.
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'.
For uncompressed arrays (byte count < 1024) the Count and data are treated 'as is'.
Line 31: Line 29:


Thus for various Array <types>
Thus for various Array <types>
*ulong Array:    > 255  // 1024 /  sizeof(ulong)
* ulong Array:    > 255  // 1024 /  sizeof(ulong)
*float thing[2]: > 127  // 1024 / 2*sizeof(float)
* float thing[2]: > 127  // 1024 / 2*sizeof(float)
*SomeStructure:  >      // count * sizeof (SomeStructure) > 1023
* SomeStructure:  >      // count * sizeof (SomeStructure) > 1023




Note that potentially compressed arrays in these structures only have an known output length.
Note that potentially compressed arrays in these structures only have an known output length. the decompressor therefore must work on infinite input length.
the decompressor therefore must work on infinite input length.
see example decompression at end of document


===Odol7Stuct===
ODOLV7
{
  StandardP3DHeader Header;
  LodStruct Lods[LodCount];
  float    Resolution[LodCount];
  struct    ModelInfo;
};


====StandardP3DHeader====
= Odol7Stuct =
StandardP3DHeader
{
  char      Signature[4];      ''//"ODOL"''
  ulong    Version;          ''// 7''
  ulong    LodCount;          ''// at least one''
}


===LodStruct===
See [[P3D Model Info]].
LodStruct
<syntaxhighlight lang="cpp">
{
ODOLV7
  '''struct''' VerticesStruct;
{
StandardP3DHeader Header;
  '''float[2]'''  UnknownFloat1;          ''// contains some max/min vertices positions''
LodStruct Lods[Header.LodCount];
  '''float[3]'''  MinPos;
ModelInfo ModelInfo;
  '''float[3]'''  MaxPos;
};
  '''float[3]'''  AutoCenterPos;
</syntaxhighlight>
  '''float'''      UnknownFloat2;
  '''struct'''  TexturesStruct;
 
  '''structs''' TableStructs;
  '''struct'''  FacesStruct;
  '''struct'''  LODSections;
  ulong          nNamedSelections;
  NamedSelection NamedSelections[nNamedSelections];
  ulong          nNamedProperties;
  NamedProperty  NamedProperties[nNamedProperties];
  ulong          nFrames;
  Frame          Frames[nFrames];
 
  '''ulong'''  Unknown[3];
  '''struct'''  ProxiStruct;
};


===VerticesStruct===
  VerticesStruct
  {
    CompressedStruct Attribs
    {
    '''ulong''' Count;              ''// if > 255 then array is compressed
    '''ulong''' Attribs[Count];   
    }
    CompressedStruct UVset
    {
    '''ulong''' Count;              ''// if > 127 then array is compressed
    '''float''' UVset[Count];     
    }
    struct Position
    {
    '''ulong''' Count;             
    '''float''' Position[Count][3]; ''// XZY
    }
    struct Normals
    {
    '''ulong''' Count;           
    '''float''' Normals[Count][3];  ''// XZY
    }
  }


*Count is the same value for all four tables.
== StandardP3DHeader ==
*The Position and Normals tables appear to be always uncompressed raw data.


===TexturesStruct===
<syntaxhighlight lang="cpp">
  struct Textures
StandardP3DHeader
  {
{
  '''ulong'''  Count;
char Signature[4]; //"ODOL" (vs MLOD eg)
  '''asciiz''' Textures[...];         ''// "data/1.paa\0data/2.paa\0"...
ulong Version; // 7
  }
ulong LodCount; // at least one
}
</syntaxhighlight>


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.


===TableStruct===
== LodStruct ==
struct TableStruct
{
  CompressedStruct
  {
  '''ulong'''  Count;            ''// if > 511 etc'' 
  '''ushort''' MlodIndex[Count];
  }
  CompressedStruct
  {
  '''ulong'''  Count;          ''// this Count is same value as any Vertices.Count''
  '''ushort''' OdolIndex[Count];''//
  }
}


Tables are used to join vertices. Each face has got 3 or 4 vertices that are unique for each face Eg. Every vertex is owned only by 1 face.
See:
'''MLOD'''vertexindex = MlodIndex[ OdolIndex['''ODOL'''vertexindex] ];''
* {{Link|#VertexTable}}
* {{Link|#Textures}}
* [[P3D Lod Edges]]
* [[P3D Lod Faces]]
* [[P3D Lod Sections]]
* [[P3D Named Selections]]
* {{Link|#NamedProperty}}
* [[P3D Lod Frames]]
* [[P3D Lod Proxies]]


===FacesStruct===
struct Faces
{
  '''ulong'''  FacesCount;
  '''ulong'''  unknown;
  '''struct''' Face
  {
  '''ulong'''  Attribs;
  '''short'''  TextureIndex;
  '''byte'''  Count;  // always 3 or 4
  '''ushort''' VerticesIndex[Count];
  }[FacesCount];
};


The TextureIndex is a zero based array. If set to -1, there are no textures for this face.
<syntaxhighlight lang="cpp">
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];
};
</syntaxhighlight>


===LOD Sections===
=== VertexTable ===
  LODSections
  {
  '''ulong'''  nSections;
  Sections[nSections]
  {
      ulong  FaceLowerIndex;
      ulong  FaceUpperIndex;
      ulong  UserValue;
      short  TextureIndex;      // -1 if not textured
      ulong  ODOL_FaceFlags;
  };
  }


===NamedSelection===
See [[P3D Point and Face Flags]].
NamedSelection
<syntaxhighlight lang="cpp">
{
struct
  '''asciiz''' name;
{  
  CompressedStruct Vertices
ulong Count;
  {
ulong PointFlags[Count]; // compressed
  '''ulong'''  Count;                 ''// if > 511 then array is compressed
ulong Count;
  '''ushort''' Vertices[Count];
UVPair UV1[Count]; // compressed
  }
ulong Count;
  CompressedStruct UnknownUshort
XYZTriplet Points[Count]; // UNcompressed
  {
ulong Count;
  '''ulong'''  Count;                ''// if > 511 then array is compressed
XYZTriplet Normals[Count]; // UNcompressed
  '''ushort'''  Unknown[Count];
}
  }
</syntaxhighlight>
  CompressedStruct UnknownUlong
  {
  '''ulong''' Count;                   ''// if > 255 then array is compressed
  '''ulong''' Unknown[Count];
  }
  '''byte''' IsSectional;
  CompressedStruct UnknownUlong2
  {
  '''ulong''' Count;                    ''// if etc
  '''ulong''' Unknown[Count];
  }
  CompressedStruct Faces
  {
  '''ulong''' Count;                    ''// if etc
  '''ushort''' Faces[Count];
  }
  CompressedStruct TextureWeights      // probably
  {
  '''ulong''' Count;                   ''// if etc
  '''byte''' TextureWeights[Count];
  }
};
===NamedProperty===


  NamedProperty
*Count is the same value for all four tables.
  {
    '''asciiz''' Name;  ''// "noshadow\0"
    '''asciiz''' Value; ''//"1\0"'
  };


===Frame===
=== Textures ===
    Frame
    {
      float FrameTime;
      ulong nBones;
      XYZTriplet [nBones];
    };


===ProxiStruct===
<syntaxhighlight lang="cpp">
ProxiStruct
struct
{
{
  '''ulong'''  Count;
ulong Count;
  '''struct''' Proxi
asciiz Textures[...]; // "data/1.paa\0data/2.paa\0"...
  {
}
  '''asciiz''' Name;
</syntaxhighlight>
  '''float''' rotationMatrix[9];
  '''float''' translation[3];
  '''ulong''' Index[2];
  }[Count];;
}


==ModelInfo==
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.
ModelInfo
{
  ulong      Index;          // typically 02 01 00 00
  float      Pair[2];        // typically 48 74 07 3F  : 48 74 07 3F . pair is often the same
  XYZTriplet Unknown;        // typically 00 00 00 00 00 00 00 00 00 00 B0 0D
  float      offset[3];        // model offset (unknown functionality)
  ulong      mapIconColor;      // RGBA 32 color
  ulong      mapSelectedColor;  // RGBA 32 color
  ulong      unknownValue;
  float      bboxMinPosition[3]; // minimum coordinates of bounding box
  float      bboxMaxPosition[3]; // maximum coordinates of bounding box
  float      wrpModelOffset[3];  // offset value to apply when object is placed on a WRP
  float      offset2[3];        // another offset value (unknown functionality)
 
 
 
  float      fArray[12];      // a mixture of floats and index values
  bytes      UnknownFlags[6]; // typically 01 00 00 01 00 16
  ulong      Count;
  float      Array[Count];    // potentially compressed
  float      UnknownFloats[4];// almost consistently 00 00 00 00 : F9 02 15 50 : 00 00 48 43 : 0A D7 A3 3B
  XYZTriplet Unknown;        // generally FF FF FF FF FF FF FF FF FF FF FF FF
}
 
===LZ in ODOL===
 
''Lempel-Ziv compression
 
Note1.


Regardless of method, 4 extra bytes representing the checksum exist at end of the data count.
=== NamedProperty ===


Note2.
<syntaxhighlight lang="cpp">
The compression code is identical to that employed by pbo packed structures. However, unlike pbo's, the size  of the compressed data is unknown, only it's ultimate length. The code below fudges it.
struct
{
Asciiz Property; // e.g "noshadow" = "1"
Asciiz Value;
}
</syntaxhighlight>




==== pascal code====
= Related Page(s) =


'''function''' LZBlockRead(var F:file; var outdata:array of byte;szout:integer):byte;
== LZ in ODOL ==
'''var'''
k, r, pr, pi,po,i,j:integer;
flags:word;
buf:'''array'''[0..$100e] '''of''' byte;
c:byte;
crc:integer;
'''begin'''
po:=0;
pi:=0;
flags:=0;
r:=0;
'''for''' k := 0 '''to''' $100F-1 '''do''' buf[k] := $20;
        '''while''' (po < szout) '''do'''
        '''begin'''
            flags:= flags '''shr''' 1;
            '''if''' ((flags '''and''' $100)= 0) '''then'''
                '''begin'''
                  BlockRead(F,c,1);  ''// direct reading from file''
                  inc(pi);
                  flags := c '''or''' $ff00;
                '''end''';
            '''if''' (flags and 1)=1 '''then'''
                '''begin'''
                  '''if''' (po >= szout)'''then''' '''break''';
                  BlockRead(F,c,1);  ''// direct reading from file''
                  inc(pi);
                  outdata[po] := c;
                  inc(po);
                  buf[r] := c;
                  inc(r);
                  r :=r and $fff;
                '''end'''
            '''else'''
                '''begin'''
                  i:=0;
                  BlockRead(F,i,1);  ''// direct reading from file''
                  inc(pi);
                  j:=0;
                  BlockRead(F,j,1);'' // direct reading from file''
                  inc(pi);
                  i :=i or ((j '''and''' $f0) shl 4);
                  j := (j '''and''' $0f) + 2;
                  pr := r;
                  '''for''' k := 0 '''to''' j '''do'''
                    '''begin'''
                      c := buf[(pr - i + k''') and''' $fff];
                      '''if''' (po >= szout) '''then break''';
                      outdata[po]:= c;
                      inc(po);
                      buf[r]:= c;
                      inc(r);
                      r :=r '''and''' $fff;
                    '''end''';
              '''end''';
        '''end''';
      BlockRead(F,crc,4);  ''// 4 byte checksum.''
      result:= pi;
'''end''';


====C code====
see [[Compressed LZSS File Format]]


'''int''' Decode('''unsigned char''' *in,'''unsigned char''' *out,'''int''' szin,'''int''' szout)
[[BIS File Formats#3D Model File Formats|Model File Formats]]
{
        szin = szin > 0? szin: 0x7fffffff;
        '''int'''  i, j, k, r = 0, pr, pi = 0,po = 0;
        '''unsigned int'''  flags = 0;
        '''unsigned char''' buf[0x100F], c;
        '''for''' (i = 0; i < 0x100F; buf[i] = 0x20, i++);
        '''while''' (pi < szin && po < szout)
        {
                '''if''' (((flags >>= 1) & 256) == 0)
                {
                        '''if'''(pi >= szin)'''break''';
                        c = in[pi++];
                        flags = c | 0xff00;
                }
                '''if''' (flags & 1)
                {
                        '''if'''(pi >= szin || po >= szout)'''break''';
                        c = in[pi++];
                        out[po++] = c;
                        buf[r++] = c;
                        r &= 0xfff;
                } '''else'''
                {
                        '''if'''(pi + 1 >= szin)'''break''';
                        i = in[pi++];
                        j = in[pi++];
                        i |= (j & 0xf0) << 4;
                        j  = (j & 0x0f) + 2;
                        pr = r;
                        '''for''' (k = 0; k <= j; k++)
                        {
                                c = buf[(pr - i + k) & 0xfff];
                                '''if'''(po >= szout)'''break''';
                                out[po++] = c;
                                buf[r++] = c;
                                r &= 0xfff;
                        }
                }
        }
        '''return''' pi;// next 4 bytes = checksum
}


=Related Page(s)=


[[BIS_File_Formats#3D_Model_File_Formats|Model File Formats]]
[[Category:BIS_File_Formats]]
[[Category:BIS_File_Formats]]

Latest revision as of 17:43, 4 January 2023

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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

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