Wouldn't displacement mapping require LOTS of triangles? And I mean _LOTS_.
  Just think that you want to apply a 640x480 displacement map to each side
of a cube. If I have understood correctly, you will need at least 2 triangles
per map pixel (like in a heightfield), which would make a total of at least
640x480x2x8 = 4915200 triangles.
  Since this kind of triangle mesh can not (AFAIK) be optimized like a
height field can be, it would take rather lot of memory.

  Perhaps I'm just exaggerating.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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