Newsgroups: comp.graphics
Path: utzoo!censor!geac!alias!imax!watcgl!rhbartls
From: rhbartls@watcgl.waterloo.edu (Richard Bartels)
Subject: Re: rotoscoping
Message-ID: <1990Oct24.130127.25869@watcgl.waterloo.edu>
Organization: University of Waterloo
References: <13485@sdcc6.ucsd.edu> <1990Oct23.204359.18883@odin.corp.sgi.com>
Date: Wed, 24 Oct 90 13:01:27 GMT
Lines: 21

In article <1990Oct23.204359.18883@odin.corp.sgi.com> robert@sgi.com writes:
>
>There is another form of rotoscoping that is sometimes used in computer
>graphics to capture motion for animation or motion studies.  If video
>tape an actor from two angles, you can use triangulation to determine
>the 3D coordinates of key points on the body, usually joints.  You now
>have what you need to animate a synthetic actor going through the same
>motion.
>

For those who have seen "A Public Service Announcement" by
Dave Forsey, Phil Barry, et. al., this is precisely how the dragon
was done.  Dave's hand was fitted with sensor-points and triangulated
as he went through hand-puppet motions.  This provided joint motions,
and the dragon was a spline surface that surrounded the joints
with attachment constraints defined at strategic locations.

(Dave is en route to UBC, so I hope he'll forgive me for popping
in like this while he's out of touch.)

-Richard