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P3D Lod Frames

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

This page contains unofficial information.

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Frames are Animation times. They are similar in nature to RTM files.

Only specific models have them, and, they are found only in certain Lod Types of that P3D.

  • In MLOD the structure is contained in the #Animation# TaggSet of the lod
  • In ODOL the structure is contained in the Lod itself.

Animated Frames are NOT to be confused with ODOLV4x (ARMA) Animation structures. Animation structures are used with skeletons.

Very few models in the official addons for arma1 and arma2 have these frames. Only RacekT.p3d eg


  ulong      nFrames;
  LodFrame   LodFrames[nFrames];


 float      FrameTime;
 ulong      nBones; 
 XYZTriplet BonePositions[nBones];


 ulong      nBytes;
 float      FrameTime;
 XYZTriplet BonePositions[nBones];
  • MLOD: nBones = (nBytes-sizeof(float)) / sizeof(XYZTriplet)
  • MLOD: nFrames = as many #Animation#s as are in the TaggStruct

For any lod that has them, there are a contiguous series of Frames making up the total. Each one has an identical number of bones (triplets).

For ODOL7 and both types of MLOD, the nLodPoints in the VertexTable is also the same as the nBones.

For Arma, there are no Vertexes in this lod, hence no LodPoints

NB: There will be 1 'Animation' chunk per Frame. This can result in VERY large p3dm mlod models. A model with three thousand (3,000) odd frames (eg. ActsPercMstpSnonWnonDnon_DancingStefan.rtm) will be approx. 200 Megabytes on disk.

This type of data format for Animation is commonly known as a 'Point Cache' or an 'MDD Point Cache'. It describes the exact location of every point in the LOD in 3D 'Model Space' for each frame.