Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!well!ewhac
From: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Newsgroups: comp.graphics
Subject: Re: Some beginner's questions & some objects
Message-ID: <5378@well.UUCP>
Date: 5 Mar 88 23:10:43 GMT
References: <612INFO@NDSUVM1> <618UD140469@NDSUVM1> <5327@well.UUCP> <637UD140469@NDSUVM1> <5362@well.UUCP>
Reply-To: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Organization: The Society to Turn Wesley Crusher into a Styrofoam Dodecahedron
Lines: 20

In article <5362@well.UUCP> shf@well.UUCP (Stuart H. Ferguson) writes:
>Scott Udell asks about the "work lines" in CAD 3D and how to remove them.
>
>The binary format for CAD 3D, the "3D3D" format files, have 3 bits in them
>that signal the lines of each triangular face as being "real" or "work" lines.
>For some reason this is lost when using the ascii output format.  If you
>don't mind bashing on the binary format you could extract the data sans
>work lines.
>
	Yes, but this doesn't address the other question:  How do you
take a set of (possibly randomly arranged) edges, and reconstruct them into
reasonable polygons?  You could play all sorts of games by comparing edge
endpoints to each other, but that seems like a messy solution, possibly
unreliable, and if your object is at all complex, it could take a long time
to figure out.  (Is this an n^2 problem?)

_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
Leo L. Schwab -- The Guy in The Cape	ihnp4!ptsfa -\
 \_ -_		Recumbent Bikes:	      dual ---> !{well,unicom}!ewhac
O----^o	      The Only Way To Fly.	      hplabs / (pronounced "AE-wack")
"Work FOR?  I don't work FOR anybody!  I'm just having fun."  -- The Doctor