PhD Thesis Proposal Defence


"Differential Techniques for Scalable and Interactive Mesh Editing"

by

Mr. Kin-Chung AU


Abstract:

Meshes are the most common representation for 3D surface models nowadays
and there is a great demand for creating and processing mesh models. In
general, designing systems for editing existing meshes is more difficult
than designing tools for creating new models, because editing is limited
by the original mesh structure, namely, the irregularities of the vertex
distribution and the connectivity. A desirable editing framework should
satisfy the user¡¦s editing requests while maintaining the original shape
features as much as possible. Therefore the description of the features is
crucial and has a direct relation on the quality of the editing system.

In this thesis we focus on mesh deformation, which is a basic but
important operation on which many other mesh processing operations are
based. We propose two new non-linear differential editing frameworks,
based on the curvature flow Laplacian coordinates and dual Laplacian
coordinates, for efficient irregular mesh editing. These frameworks
overcome the main limitations of earlier linearized methods, specifically,
they solve the common transformation problem and avoid undesired
distortion in most editing scenarios, including large scale rotations and
translations of the handles. In addition, these frameworks support a new
type of handles, point-handle, which enables automatic orientation
estimation, thus further simplifying the user interface.

Meshes created by modern scanning technology are typically huge. Editing
such meshes with a nonlinear editing framework gives degraded and
unacceptable performance. We introduce the notion of handle-aware rigidity
and present a general reduced model, based on handle-aware isolines, which
enables interactive editing of huge models with physically plausible
deformation results. This reduced model allows us to establish parametric
correspondences between meshes with large geometry differences. We
demonstrate the use of such correspondences in deformation transfer.


Date:     		Friday, 25 May 2007

Time:                   3:00p.m.-5:00p.m.

Venue:                  Room 3405
			lifts 17-18

Committee Members:      Dr. Chiew-Lan Tai (Supervisor)
			Dr. Pedro Sander (Chairperson)
			Dr. Philip Fu
			Prof. Long Quan


**** ALL are Welcome ****