clarke@csri.toronto.edu (Jim Clarke) (01/27/89)
GRAPHICS SEMINAR - Tuesday, February 7, 3 p.m. in Room GB 120
(GB = Galbraith Building, 35 St. George Street)
Mikio Shinya
NTT Electrical Communications Laboratories
Tokyo, Japan
"Principles and Applications of Pencil Tracing"
Pencil tracing is a new approach to ray-tracing which allows faster image
synthesis and greater physical fidelity. It uses paraxial approximation
theory from optics, where the transformations of a pencil of rays through
the optical system are formulated as 4x4 transformation matrices. The
theory also provides for an error analysis in the form of functions that
estimate the approximation errors and determine constraints on the spread
of the pencil.
The applications described include ray-tracing with a system matrix, ray
interpolation and extended "beam-tracing" using a generalized perspective
transform. Pictures and experimental results will illustrate the advantage
of these methods.
--
Jim Clarke -- Dept. of Computer Science, Univ. of Toronto, Canada M5S 1A4
(416) 978-4058
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