EnigmA Amiga Run 1997 July/EnigmA AMIGA RUN 20 (1997)(G.R. Edizioni)(IT)[!][issue 1997-07 & 08][EAR-CD IV].iso/lightwave/lwmlist/95.lightwave-07/[e-mail]_Thu Jul 27 00:21:24 1995.msg

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Date: Sat, 22 Jul 95 02:48:00 UTC
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Subject: Re: Polygon problems
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Reply:  Item #4269527

My experience has shown me that align can flip polys repeatedly when
there are 1 and 2 point polygons in the object. At other times this
happens when some polygons are so small, and overlapping, that the
align function kind of loses track of whether the object is inside or
out at that point in the internal flip process. Think of this like a
towel folded back on itself.

When you encounter problems with align and flip, do the following:
1) Delete all polygons with less than 3 points.
2) Select non-planar polygons, and triple if they exist.
3) Merge points
4) Unify polygons
5) Align polygons, and note how many polys flipped
6) Align polygons. If any polygons flipped at this point, go back to 1).
7) If no polygons flipped, you are done, just verify the object is
   rightside out.

After you do this a few times and verify you no longer have non-planar
polygons (or only 3 point polys exist) repeat the loop back at step 3).

When you go through the loop and polygons still flip in step 6, it is
time to get rid of more points with point merge, but you can't use
the auto option. Do the following:
a) Merge points with a small value, say 1mm, and see if any points
   merge.
b) If no points are merged, repeat step a) with slightly larger
   values until some points merge.
c) Once points have merged, go to step 1) above and crunch through
   again.

Now, don't be too surprised if you get through to step c) a couple of
times. When you still can't get to step 7), do this whole procedure on
only parts of your object, until the pieces you align polys on no
longer find any polys to flip, and move onto the next piece. This will
narrow your problem down to smaller pieces.

Eventually though, you should make it to step 7) with no more phantom
poly flipping.

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