Lightwave–Boolean Drill
5 messages in this thread
Sometimes when using the Boolean Drill operation, polygons behave strangely.
Sometimes they flip for no reason, sometimes they disappear completely. For
example, While modeling an alien I used the Boolean Union drill to attach his
nose. After my amiga crunched its numbers, the nose was attached, but to
nothing. All of the polygons around the nose on the face had vanished. Also
several random polygons all over the alien had vanished, and some had flipped.
What is causing this, is it a bug or am I doing something wrong.
Michael A. Painter
Well, this might not be the answer that you are looking for but here
goes! The boolean functions require absolute topographical integrity
to work properly. If you were to create two spheres that you needed
to join and one of those spheres had a hole in it about the size of a
gnats eyelash it will not work. That object has ceased to be a
spherical solid and is now only a shell. When the boolean is done it
all gets screwed up. Try this – make sure that the head is a complete
solid (no hole for the neck, eyes, mouth… nothing), then make sure
the same is true for the nose (no nostrils, just like hayfever
season). This should fix it. If not, I would be somewhat
surprised. Also make sure that the normals are all correct before
starting and do not double your polygons. If you have doubled
polygons then you have created a "shell" without going to the trouble
of creating a hole.
When you say "doubled" polygons, don't you mean "tripled"?
-Chris
Nope. Doubled polygons are those which share identical points but in fact are
two polys which have two normals facing in opposing directions. Some of the
objects imported from Imagine models have their polys doubled. This assures
that no polys will be flipped the wrong way but it eats memory and in the case
of Boolean functions, gets things all awry.
Jim
NON-PLANAR polygons might also be the culprit. Try going into the display menu.
With Polygon selected hit the STATS button. From the STATS Requester hit the
NON-PLANAR button. This will select all the NON-PLANAR polygons.
After they are selected and are yellow, triple them. Repeat the step until you
remove all NON-PLANAR polygons.
This trick has helped me many times…..!
Good Luck!!