XeNTaX

grandshot wrote: ↑Wed Feb 09, 2022 8:39 pm Trying to research bone anim format. By reverse engineering the verender2.dll file with included *.pdb, managed to get bone structures. Turned out what they having the following format:

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struct BONE {
    char name[20];
    byte parentID;
    byte groupID;
    byte rootGroupID;
    uint32 packedAnimSize;
    if( packedAnimSize )
    {
        PACKED_ANIM packedVectors;
        PACKED_ANIM packedQuats;
    };

};

PACKED_ANIM structure is next:

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struct PACKED_ANIM( int itemType ) {
    uint32 numPackedItems;
    PACKED_VECTOR3 item[numPackedItems]; //Vectors or Quats packed to 3x uint16 per item. Unpacking functions is included.
    ARRAY packedIDs;
    ARRAY originalIDs;
    uint16 numFrames; //total frame count for bone. Often same value as in header. Useful for determine structure ending.
};

Array structure in turn:

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struct ARRAY {
    uint16 numItems;
    uint16 numBits; //per item
    
    uint64 item : numBits  // in the count of numItems. uint64 because numBits can be 48. Bitfield padding off
    ubyte numBitsKey : 8;
    uint64 mask : numBits; //not used?
};

Main problem here is how to allocate correct size of items in array. No matter how I tried, I cant figure out. Obvious things such as numItems mul to numBits and align to ceil bytes dont fit here.
This is the last frontier in the fully research of the format. In attch I privide my 010 editor template for parsing bones and verender2.dll & pdb.

ve_boneanim_research.zip

 
char* name (Always 0x15)
byte parent;
byte group;
byte rootGroupID (I think this is supposed to be for special bone names);
uint32 MemoryCommitSize;
uint32 array_count
packed3DVector* v
packedQuat* q

 void __usercall TShrinkedArray::Allocate(TShrinkedArray *this@<esi>, int s@<ebx>)
{
  __int64 v2; // rax
  int v3; // ecx
  unsigned int *element; // edi
  unsigned int *v5; // eax
  size_t v6; // [esp-8h] [ebp-Ch]

  v2 = s * this->nBits + 31;
  v3 = ((BYTE4(v2) & 0x1F) + (int)v2) >> 5;
  if ( v3 != (this->nBits * this->array_size + 31) / 32 )
  {
    element = this->element;
    this->array_size = s;
    v5 = (unsigned int *)operator new(4 * v3);
    v6 = 4 * ((this->nBits * this->num + 31) / 32);
    this->element = v5;
    memmove(v5, element, v6);
    if ( element )
      operator delete(element);
  }
}