Как рассчитать tangent space с помощью NVMESHMENDER? (комментарии)

void _arrays::MeshTangentSpaceCPU(bool invertIndexes,float min_smooth_angle)
{
  // return;

  std::vector< MeshMender::Vertex > theVerts;
  std::vector< unsigned int > theIndices;
  std::vector< unsigned int > mappingNewToOld;
  MeshMender mender ;

  int i;

  for( i=0;i<numverts;i++)
  {
    MeshMender::Vertex v;

    v.pos[0] = verts[i][0];
    v.pos[1] = verts[i][1];
    v.pos[2] = verts[i][2];

    v.s = tex_st[i][0];
    v.t = tex_st[i][1];

    //meshmender will computer normals, tangents, and binormals, no need to fill those in.
    //however, if you do not have meshmender compute the normals, you _must_ pass in valid
    //normals to meshmender
    theVerts.push_back(v);
  }

  if(invertIndexes)
  {
    for(int ind=numIndexes-1;ind>=0;--ind)
      theIndices.push_back(Indexes[ind]);
  }
  else
  {
    for(int ind = 0 ; ind < numIndexes; ++ind)
      theIndices.push_back(Indexes[ind]);
  }

  // pass it in to the mender to do it's stuff
  mender.Mend( theVerts,  theIndices, mappingNewToOld,min_smooth_angle,min_smooth_angle,min_smooth_angle);

  // смотрим какой новой вершине соотвествует старая
  for(i=0;i<(int)mappingNewToOld.size();i++)
  {
    int oldID=mappingNewToOld[i];
    int newID = i;

    VectorCopyAB(verts[oldID],theVerts[newID].pos);

    tex_st[oldID][0]=theVerts[newID].s;
    tex_st[oldID][1]=theVerts[newID].t;

    VectorCopyAB(basisx[oldID],theVerts[newID].tangent);
    VectorCopyAB(basisy[oldID],theVerts[newID].binormal);
    VectorCopyAB(basisz[oldID],theVerts[newID].normal);
  }

  theVerts.clear();
  theIndices.clear();
  mappingNewToOld.clear();
}