Stephen Mann
Research Talks
Last Updated: July 18, 2013
This pages contains the slides I used in some talks I have
given.
 Quasiconformal Plane Deformations.
July 18, 2013.
This is a CGL talk discussing a 2012 paper of
Lipman, Kim, and Funkhouser.
 A talk I gave on
multivariate interpolation at the BIRS
Algebraic Geometry and Geometric Modeling workshop. January, 2013.
 I gave two talks (CGL20120405.pdf and CGL20120607.pdf) to
CGL based on work on perspective projection in
Geometric Algebra that I'm doing with Ron Goldman.
 Why Multivariate Polynomial Data Interpolation Goes Bad,
October 27, 2011.
This is a talk I gave at the SIAM/ACM GDM conference.
 Linear Methods for Degree Reduction of Bézier Curves with Geometric Continuity,
October 24, 2011.
This is a talk I gave at the SIAM/ACM GDM conference.
 Issues with Multivariate Polynomial Interpolation,
October 6, 2009.
This is a talk I gave at the SIAM/ACM GDM conference
on issues (and solutions) multivariate data
interpolation with polynomials. The talk is fairly
high level; details on what we did are not in the
talk.
 Flank Millable Surface Design
with Conical and Barrell Tools.
June 27, 2008.
This is a talk I gave at CAD 08 on work done
by Chenggang Li for his PhD that I cosupervised
with Prof Sanjeev Bedi.
 Proving the LaneRiesenfeld Algorithm.
June, 2005.
This is a CGL talk based on a talk that Ron
Goldman gave at a Dagstuhl seminar.
 Bivector Continuity.
May, 2005.
This is a talk that I gave at a Dagstuhl seminar.
 Computing u,v Coordinates.
This is a CGL talk I gave on how to invert
a bilinear map. We thought we had a slick,
geometric method, but alas, the geometry
was wrong.
 Using geometric algebra to computer singularities in 3D vector fields.
January 9, 2002.
This is a CGL talk I gave
describing my work with Alyn Rockwood on using
octrees and geometric algebra
to find singularities in 3D vector fields.
 A Geometric
Interpretation of Bézier Stability November 29, 2001.
This is a talk I gave to CGL on Bézier stability.
This talk is based on a talk by Helmut Pottmann
at the 4th Dagstuhl Workshop on Geometric Design.
Comparisons to monomials and relative analysis
are my extensions, so send me the blame and send
Helmut the praise. See also the last slide,
which contains a "study" for my foray into the
Fine Arts.
 Are Isophotes and
Reflection Lines the Same? October 11, 2000.
This is a talk I gave to the CGL on isophotes and
reflection lines. This talk is essentially the
same talk as given by Hogel Theisel at the 1999
SIAM Conference on Geometric Design in Albequerque,
New Mexico. My thanks to Hogel for sending me
the PostScript for his slides, from which I
extracted all of the figures in this talk.
 Geometric Algebra
October 6, 2000.
A variation on the SIGGRAPH talk that I gave
at Aliaswavefront in Toronto. There is an
associated Matlab file
that should be renamed GAD.m after downloading.
You will also need a copy of
GABLE, which in turn
needs Matlab to run (version 5.2 or later).
 GABLE July 25, 2000.
Also available as
pdf
A presentation I gave for a course on geometric
algebra at SIGGRAPH 2000. I did the presentation
jointly with Leo Dorst, who demonstrated in
Matlab the ideas I presented on these slides.
To get the most out of the slides, you
should download
GABLE,
and run the
GAD file (GA Demo) at
the points marked on the slide. Note that
you will need Matlab to run GABLE.
 Polynomial Precision Triangular Interpolants July 3, 2000.
A talk I gave at the Fifth Conference
on Mathematical Methods for Curves and
Surfaces in Oslo.
 Multiresolution Editing of Pasted Surfaces June 30, 2000.
A talk I gave at the Fifth Conference
on Mathematical Methods for Curves and
Surfaces in Oslo.
 Geometric Algebra: An Introduction
January 5, 2000.
A introductory talk I gave on Geometric Algebra
to the CGL. This is a short version of
the talk I gave the previous year in
Saarbruecken.
 Surface Pasting
November 4, 1999.
A talk on surface pasting that I gave at
the 1999 SIAM Conference on Geometric Design.
 Polynomial Precision Triangular Interpolants (compressed PostScript, 328k),
October 1, 1999.
A talk about functional triangular interpolants
that achieve polynomial precision by adjusting
continuity between patches.
 Geometric Algebra: An Introduction
September 21, 1999.
A introductory talk I gave on Geometric Algebra
when I visited the University of Saarbruecken.
 Cylindrical Surface Pasting (compressed PostScript, 1100k),
May 22, 1999.
Dagstuhl Seminar. A talk about a cylindrical
surface pasting.
 Cylindrical Pasting,
March 20, 1999.
A discussion on the cylindrical pasting
research in CGL. This talk was
given to UToronto DGP group when
they visited our lab.
 How To Give a Talk Talk,
November 24, 1998.
A web version of the alternative version of the
How To Give a Talk talk
that I gave to our graphics lab at Waterloo.
This talk gives some tips on how to give a talk,
using a talk on CAVD (Computer Aided Violin Design)
as an example.
 An Improved SideVertex Triangle Mesh Interpolant (compressed PostScript, 670k),
June 18, 1998.
GI 1998. A talk about a local sidevertex
triangular interpolant that has improved
shape.
 Pasting Research,
May 22, 1998.
An updated version of the talk given to
DGP.
 Pasting,
March 21, 1998.
A overview of the current research
on pasting in CGL. This talk was
given to UToronto DGP group when
they visited our lab.
 Radiosity,
February 18, 1998.
An introductory talk that I gave to
the Computer Science Club at Waterloo
as background for their radiosity
programming project.
 How To Give a Talk Talk,
February 4, 1998.
A web version of the How To Give a Talk talk
that I gave to our graphics lab at Waterloo.
This talk gives some tips on how to give a talk.

Modeling with Triangular Surface Patches
(PostScript, 2 Meg)
A mistitled talk, it should be
"A Parametric Hybrid Triangular Surface Interpolant",
this is an updated version of the Vanderbilt
talk, with a few corrections, etc.
Also, this talk is in color, so you'll
probably only be able to view it on a color
display, and printing it might not be such
a good idea.

World Space Surface Pasting (compressed PostScript, 7 Meg)
A talk about a surface pasting user
interfaces that one of my students
developed.
This file is PostScript that was generated
by showcase, and it is HUGE. And color.

Writing Your Thesis
An informal talk I gave to our graphics lab
discussing common errors I find when I
read Master's and PhD theses. Note that
this was not a talk about writing; rather,
I was just describing errors that I commonly
mark when reading theses.

Modeling with Triangular Surface Patches
February, 1997
A slightly updated version of the Vanderbilt talk.
These are color slides.

Modeling with Triangular Surface Patches
November, 1996
A talk I gave while visiting Vanderbilt University.
In this talk, I discuss my latest research (done
jointly with my student Matthew Davidchuk)
on triangular surface fitting.

Hyperbolic Geometry September, 1996
An informal talk I gave to our graphics lab at Waterloo.
In this talk, I discuss the Poincare model of the
hyperbolic plane, it's relation to some of
Escher's pictures, and describe a Tcl script I
wrote for drawing Escherstyle sketches.

Triangular Surface Fitting July, 1996
This talk was given at the University of Kaiserslautern.
In this talk, I discuss some of the issues related to
triangular surface fitting.
This file is about 2 Megabytes because there are PostScript
versions of the color slides I showed during the talk.

Algorithms from Blossoms July, 1996
This talk was given at
the University of Kaiserslautern.
An expansion of the talk I gave a the Curves
and Surfaces conference in Chamonix, in this
talk I discussed how to create efficient algorithms
from blossom equations.

Sablonniere Type Composition Algorithms
June, 1996
I gave this talk at the Curves and Surface Conference,
in Chamonix, June 1996.
A talk noting the similarity in speedups to
basis conversion algorithms and speedups to
polynomial composition algorithms.

Programming Support for Blossoming May, 1996
Wayne Liu gave this talk at GI '96. He made
his slides with CorelDRAW!, which created
nonconforming PostScript. I remade the
slides in LaTeX, reproducing most, but not all, of the
figures. What you see here is the LaTeX version.

Coordinate Free Geometry April, 1996
An informal talk I gave to our graphics lab at Waterloo.
This talk provides motivation for using a
geometry ADT. The ADT mentioned in this talk
was originally implemented by Tony DeRose;
I ported it to ANSI; and several ports have
been made to C++.

Optimal Polynomial Composition November, 1995
This talk was given at the 1995 SIAM
Conference in Nashville, TN.
This talk discusses an optimal polynomial composition
algorithm.
This work has been accepted for publication to ACM TOG.
 Modeling with
Triangular Bézier Patches February, 1995
A talk I gave at Purdue on triangular
surface fitting. None of the color slides
appear here in the PostScript.

Generalized Polynomial Composition February, 1995
A second talk I gave at Purdue. I drew a couple
of figures by hand, so they're missing from
the slides.

How to give a talk March, 1993
An informal talk I gave to our graphics lab at Waterloo.
This talk gives some tips on how to give a talk.
Note that the URL mentioned at the end of the
talk is restricted to CGL machines.