Since the problem is much more pronounced in megapov, it seems quite clear
that it's some kind of bug.

  However, the general problem of getting odd-looking shadows in smooth
triangle meshes (and a smooth heightfield is just that) is not actually a
bug, but is caused by a self-shadowing problem which is not trivial to fix
(at least so that it will always work correctly and "physically" correctly).
  I have discussed this problem in p.programming and proposed a solution,
but it seems that it will not be corrected anytime soon (if it _is_ possible
to correct completely at all).
  You can get rid of the problem by making the object in question
shadowless. If, however, the shadows of the object are important, then there's
little you can do (besides making the mesh more detailed, ie. with more
triangles).

  In short, the problem is that the object shadows itself in parts that
should be lit due to the normal modifiers. But because normal modifiers are
only "fake" and they do not actually modify the shape of the surface, the
self-shadowing works like with unmodified normals. Making the object
shadowless eliminates this self-shadowing (but this is not always a good
solution if the shadow of the object is important).

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

Post a reply to this message