Rtm Binarised File Format: Difference between revisions

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=UnBinarised Format=
= UnBinarised Format =


For unbinarised see [[Rtm (Animation) File Format]]
For unbinarised see [[Rtm (Animation) File Format]]


=Binarised format=
= Binarised format =


Binarised rtm was introduced for the Arma2 engine.  
Binarised rtm was introduced for the Arma2 engine.  
Line 16: Line 16:
  version 5: Arma3 (1024 byte compression rule changed to prefixed flag)
  version 5: Arma3 (1024 byte compression rule changed to prefixed flag)


==Structure==
== Structure ==
  RTMB
  RTMB
  {
  {
Line 39: Line 39:
BoneNames are the traditional Bis catenated strings. One after the other separated by '\0'. Unlike most others encountered in Bis file architecture, there is no final terminating double null because the count is already known.
BoneNames are the traditional Bis catenated strings. One after the other separated by '\0'. Unlike most others encountered in Bis file architecture, there is no final terminating double null because the count is already known.


==RTMBHeader==
== RTMBHeader ==
  RTMBHeader
  RTMBHeader
  {
  {
Line 45: Line 45:
   ulong        Version;      // 3==A2, 4,5==A3
   ulong        Version;      // 3==A2, 4,5==A3
  }
  }
==FrameTimes (compressed)==
== FrameTimes (compressed) ==


  FrameTimes
  FrameTimes
Line 60: Line 60:
   byte compressed; // 0 for not compressed, 2 for compressed
   byte compressed; // 0 for not compressed, 2 for compressed


==FramePosition  (compressed)==
== FramePosition  (compressed) ==


  FramePosition
  FramePosition
Line 72: Line 72:
Version 5 FramePosition's are optionally compressed with the same compression flag as FrameTimes.
Version 5 FramePosition's are optionally compressed with the same compression flag as FrameTimes.


===Transform===
=== Transform ===
following information supplied by 'Voyager' to whom all honor and glory
following information supplied by 'Voyager' to whom all honor and glory


Line 99: Line 99:
=== Frame Properties ===
=== Frame Properties ===


  FrameProperty
  FrameProperty// eg "var"="thing";
  {
  {
     ulong always_0;
     ulong default; // generally 0 sometimes -1
     asciiz kind; // "StepSound" in all current A3 files.
     asciiz name; // "StepSound" in all current A3 files.
     float frame_time;
     float frame_time;
     asciiz unknown; // "" in all current A3 files.
     asciiz value; // "" in all current A3 files.
  };
  };


{{GameCategory|ofp|Modelling}}
{{GameCategory|ofp|Modelling}}
[[Category:BIS_File_Formats]]
[[Category:BIS_File_Formats]]

Latest revision as of 06:07, 20 January 2024

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Disclaimer: This page describes internal undocumented structures of Bohemia Interactive software.

This page contains unofficial information.

Some usage of this information may constitute a violation of the rights of Bohemia Interactive and is in no way endorsed or recommended by Bohemia Interactive.
Bohemia Interactive is not willing to tolerate use of such tools if it contravenes any general licenses granted to end users of this community wiki or BI products.


UnBinarised Format

For unbinarised see Rtm (Animation) File Format

Binarised format

Binarised rtm was introduced for the Arma2 engine.

There are currently three versions.

version 3: Arma2 family, some found in Arma3 files too
version 4: Arma3
version 5: Arma3 (1024 byte compression rule changed to prefixed flag)

Structure

RTMB
{
  RTMBHeader       Header;
  byte             Always1;              // ??
  XYZTriplet       Displacement;
  ulong            nFrames;              // 55 eg
  ulong            Generally0;           // ??
  ulong            nBones;               // same value as NoOfBones
  ulong            NoOfBones;            // 128 eg
  Asciiz           BoneNames[NoOfBones]; // "weapon\0\rightarm\leftarm\etc..."
  if (Version >= 4)
  {
     ulong         Zero;            // probably count and structure
     ulong nFrameProperties;
     FrameProperty FrameProperties[nFrameProperties];
  }
  FrameTimes       FrameTimes;           // CompressedFloats
  FramePosition    FramePositions[nFrames];// CompressedFrames
}

BoneNames are the traditional Bis catenated strings. One after the other separated by '\0'. Unlike most others encountered in Bis file architecture, there is no final terminating double null because the count is already known.

RTMBHeader

RTMBHeader
{
 char[4]       Type;          //"BMTR" 
 ulong         Version;       // 3==A2, 4,5==A3
}

FrameTimes (compressed)

FrameTimes
{
 ulong nFrameTimes;          // should always be same as nFrames
 float Array[nFrameTimes];
}

This is the traditional Bis potentially-compressed lzo structure, where, if, the total bytes stored >=1024, the array is compressed (in lzo format). All bones are 'held' in a position and orientation (specified by FramePosition) for the duration of that frametime period.

Version 5 files use the same new compression rule as Version 64 ODOL .P3D files; each compressed array is prefixed by:

 ulong elementCount;
 byte compressed; // 0 for not compressed, 2 for compressed

FramePosition (compressed)

FramePosition
{
 ulong   ThisFrameNoOfBones;               // Should always be same as nBones
 Transform  Transforms[ThisFrameNoOfBones];
}FramePositions[nFrames];

Each bone is held in this position and orientation for this frametime. ThisFrameNoOfBones is irrelevant to the engine and always must be the nBones value. It is present however because of efficiencies in using the standard bis lzo compression methods which rely on this 'count'.

Version 5 FramePosition's are optionally compressed with the same compression flag as FrameTimes.

Transform

following information supplied by 'Voyager' to whom all honor and glory

transform
{
  short  Qnion[4]; //compressed xyzw Rotation
  short  XYZ[3];// Compressed triplet
};
Quarternion(qX=Qnion[0]/16384,qY=Qnion[1]/16384,qZ=Qnion[2]/16384,qW=Qnion[3]/16384);

Triplet(X=Convert(XYZ[0],Y=Convert(XYZ[1],Z=Convert(XYZ[2]);
double Convert(ushort value)
{
 double sign = ((value & 0x8000) != 0) ? -1 : 1;
 // S eeeee xxxxxxxxxx
 ushort exponent = (value & 0x7FFF) >> 10;//5bits
 double significand = (double)(value & 0x03FF) / (1 << 10);
 if (exponent == 0) {
   return (sign / 0x4000) * (0.0 + significand );
 }
 return sign * Pow(2, exponent - 15) * (1 + significand ); }
}

Frame Properties

FrameProperty// eg "var"="thing";
{
   ulong default; // generally 0 sometimes -1
   asciiz name; // "StepSound" in all current A3 files.
   float frame_time;
   asciiz value; // "" in all current A3 files.
};