Meeting Agenda
Meeting Agenda
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DEPARTMENT OF COMPUTER SCIENCE
UNIVERSITY OF WATERLOO
SEMINAR ACTIVITIES
MASTER'S THESIS PRESENTATION
-Thursday, August 13, 1998
Itai Danan, graduate student, Dept. Comp. Sci., Univ.
Waterloo, will speak on ``Radiosity for Dynamic
Environments''.
TIME: 2:30-3:30 p.m.
ROOM: DC 1304 *NOTE ROOM CHANGE*
ABSTRACT
Generating realistic images in real-time to create
truly dynamic environments is a difficult task.
Radiosity is a rendering technique used to produce
realistic images. Unfortunately, computing radiosity
solutions in real-time is nearly impossible. A few
researchers have attempted to achieve this goal by
using incremental rendering techniques based on
radiosity. A major problem of previous attempts is
that too much needs to be recomputed between
consecutive images. My thesis presents a way to
minimize the computation required between images.
Incremental radiosity algorithms work by identifying
the differences between consecutive images and
computing the difference between the radiosity solution
of the two images. Because radiosity is a global-
illumination technique, differences between consecutive
images can be large even for small changes. The
innovative algorithm described in this thesis combines
a progressive refinement hierarchical formulation of
radiosity with other incremental radiosity algorithms
in a way to minimize the amount of computation required
between consecutive images.
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Advanced Image Synthesis
Spring 1998
What:
CS788 students are required to give formal public presentations
describing and summarizing their projects and the related theory.
Presentations will be 20 minutes in length, with 10 minutes for
questions and discussion.
Anyone with an interest is invited to attend. Please note that
the talks will be presented on two separate dates, August 21st
and August 27th.
When:
Aug 21, 1998
1:30---2:00
Where:
DC 1304
Who:
Carsten Whimster
Interactive Global Illumination
Hardware rendering, augmented with shadows, can be used to
accelerate the last two bounces of a light path tracing global
illumination algorithm. An implementation of this algorithm was
performed, using a scattering of a few hundred infinitesimal
area sources and the shadow volume reconstruction algorithm.
When:
Aug 27, 1998
1:00---3:30
Where:
DC 1304
Who:
(1:00) Ian Stewart
Acceleration of General Implicit Surface Raycasting
The interval Newton method can be used to robustly find all
roots along a ray through arithmetically computable functions,
which can be used to render general implicit surfaces.
Unfortunately, naive interval analysis is relatively slow.
Fortunately, there are ways to greatly speed up the process
that do not sacrifice robustness.
(1:30) Jan Kautz
Interactive Rendering with Arbitrary Reflectances
Bidirectional reflectance distributions are general models of
surface reflectance. They can be decomposed into sums of
separable functions by finding the SVD of a sampled matrix
representation of the BRDF. This compressed representation of
the BRDF lets us use hardware texture mapping, compositing,
and accumulation operations to reconstruct the reflectance.
(2:00) Caroline Kierstead
Simulation of Reflectance due to Subsurface Scattering
Many important real materials, such as skin, leaves, and
painted surfaces, are composed of multiple layers of
semitranslucent materials, each of which scatters, absorbs,
and reflects light. A Monte Carlo simulator was built to
estimate the bidirectional reflectance distributions from
such surfaces. This was compared with the analytic,
first-bounce solution.
(2:30) Shalini Aggarwal
Rendering and Modelling with A-Patches
A-patches are implicit surfaces based on Bezier tetrahedra
that are guaranteed to contain a single-sheeted algebraic
surface patch where all line segments between one vertex/face
pair intersect the patch exactly once. Under such conditions
the patches can be quickly and robustly rendered using a scalar
root solver. A-patches were analyzed with blossoming techniques,
and used to fit surfaces to parametric scattered data.
(3:00) Eric Hall
Texture Mapping Pasted Surfaces
Pasted surfaces can be used to adaptively and efficiently add
detail to a spline surface. However, due to the lack of a
global surface parameterization, texture maps on these
surfaces can exhibit discontinuities. Various techniques were
explored to obtain a suitable continuous global
parameterization.
For More Information:
http://www.cgl.uwaterloo.ca/~mmccool/cs788/