CGGC seminar (talk #202)        *** Ph.D. Talk ***
Date:  Sunday 17/02/2013
Time:  1:00 pm 
Room:  Taub 337
Speaker: Zohar Levi (Computer Science, Technion)
Title:   Methods in Geometry Processing
I will describe two researches on shape modeling.
In the first research we present a new framework for real-time shape
deformation with local shape preservation and volume control. Given a
3D object, in any form, one would like to manipulate the object using
convenient handles, so that the resulting shape is a natural
variation of the given object. It is also important that the
deformation is controlled, thereby enabling localized changes that do
not influence nearby branches.
For example, given a horse model, a movement of one of its hooves
should not affect the other hooves. Another goal is the minimization
of local shape distortion throughout the object. The first ingredient
of our method is the use of Interior Radial Basis Functions (IRBF),
where the functions are radial with respect to interior distances
within the object. The second important ingredient is the reduction
of local distortions by minimizing the distortion of a set of spheres
placed within the object. Our method achieves the goals of convenient
shape manipulation and local influence property, and improves the
latest state-of-the-art cage-based methods by replacing the cage with
the more flexible IRBF centers. The later enables extra flexibility
and fully automated construction, as well as simpler formulation.
In the second research we present ArtiSketch - a system which allows
the conversion of a wealth of existing 2D content into 3D content by
users who do not necessarily possess artistic skills. Using
ArtiSketch, a novice user may describe a 3D model as a set of
articulated 2D sketches of a shape from different viewpoints.
ArtiSketch then automatically converts the sketches to an articulated
3D object. Using common interactive tools, the user provides an
initial estimate of the 3D skeleton pose for each frame, which
ArtiSketch refines to be consistent between frames. This skeleton may
then be manipulated independently to generate novel poses of the 3D
Joint work with David Levin (Math, TAU, first research) and Craig
Gotsman (CS, Technion, second research).
This talk summarizes the Ph.D research of the speaker under the
supervision of Prof. Craig Gotsman.
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