kind of like that (not tested):
Code:

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int i = 0;
LPD3DXMESH pmesh = (LPD3DXMESH)ent_getmesh(NULL, i, 0);
while(pmesh)
{
  
  // add the triangles of the mesh to newton here

  i++;
  pmesh = (LPD3DXMESH)ent_getmesh(NULL, i, 0);
}

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