=> R1 = offset to add to the points [(current location at which points are loaded in memory)-(the old location from where they were saved, stored in the file)]
R2 = offset to add to the primitives [idem]
R3 = location at which points are loaded (TMmemoryblock+4, mostly)
R4 = location at which primitives are loaded (TMmemoryblock+16, mostly)
When you have loaded a file you have to adjust all its internal links (i.e. the ldm of the points used by the polygons); you should call this from inside the loader code (see later).
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