[ REQ 5410]: OFF files

["Mark Phillips" <mbp>]

Ken:
    The files in the data/things directory are things that we got from
elsewhere, so I'm not sure about whether they follow any conventions,
such as consistent orientation or convexity.  I'm forwarding your note
to everyone else on the staff here, thinking that some of the people
who actually found these files might know more about them than I do.

Everyone else:
    If you know answers to the questions below, please respond.  Thanks.

--Mark


Date: Tue, 23 May 1995 14:42:47 -0700 (PDT)
From: Ken Thornton <thornton at george.ee.washington.edu>
Subject: OFF files
To: mpb at geom
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

Hi, Mark:

I just installed Geomview and would like
to know about the OFF files in the 
data/things directory.

1) Are the faces guaranteed to be 
   consistently oriented? (If I traverse,
   say CCW, does the normal point away
   from the object?)

2) Are the faces convex? Most of the objects
   have a maximum of 4 vertices per face,
   but some of the objects (such as the
   space station) have up to 9 vertices per
   face.

I have a hidden surface removal algorithm
that works for properly oriented convex
faces.

Thanks, Ken

------------------------------------
Ken Thornton
University of Washington
Department of Electrical Engineering
211 EEB 
Box 352500
Seattle, WA 98195-2500
thornton at ee.washington.edu

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