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000288_owner-lightwave@webcom.com_Sun Jul 16 13:24:21 1995.msg
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1995-08-06
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Date: Sun, 16 Jul 1995 16:27:18 -0400 (EDT)
From: Joe Angell <jangell@risd.edu>
Subject: Re: Polygon Problems
To: Thomas Healy <Thealy@nesbbx.rain.com>
Cc: LightWave@webcom.com
In-Reply-To: <9507161905.0ge3@nesbbx.rain.COM>
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> POLYGON ERRORS:
>
> Hey all,
> I've been messing with the old trick of Subdividing a Plane into major
> polygons and then applying a displacement imagemap of a topographical map
> to it. Everything seems ok but when I render it, I have "Gaps" of flipped
> polygons. They are random about the object. They apear to be flipped away
> from the camera. I've saved the transformed object, loaded it into modeler,
> and hit the old Align button, but it still has the gaps. This is a pretty
> high polygon count object, so I know I'm not getting wierd effects from the
> displacement map....I'm stumped as to what I can do. Any ideas??
Did you tripple the polygons after subdividing? LW 3.5 lets you subdivide
into Quads instead of Triangles. If you try to use bones of displacement
mapping on Quads or greater, then the shifting of points will likly make
the polygons non-planar. If the non-planar stuff gets severe enough, LW
decides you can't see the surface normal, and thus you can't see the
polygon. Just Triple your objects, and it'll be fine...
If that doesn't work, some polys may be flipped the wrong way. The
easiest way to fix it (short of going through by hand) is to click on
Double Sided in the Surface panel. That should do it...
-- Joe
--
Joe Angell <jangell@risd.edu> sent this message.
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