Rendering (PowerPoint)

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					Modeling & Simulating Appearance

Models
          Light
          Light Sources
          Shapes
          Materials
              Interfaces: Reflection and texture models
              Medium: Atmospheric scattering models
          Camera
              Lens and film
Simulation
          Illumination

CS348B Lecture 18                               Pat Hanrahan, Spring 2005
The Goals of Rendering

Goals
 Accurate physical simulation (perfect match)
 Artistic or expressive (tell a story)
 Informative or useful (visualize some data)


Approaches
 Physical simulation of light
 Graphics design and communication
 Perception and cognition


CS348B Lecture 18                         Pat Hanrahan, Spring 2005
D. Enright, S. Marschner, R. Fedkiw
CS348B Lecture 18   Ralph Goings   Pat Hanrahan, Spring 2005
Richard Estes
Richard Estes
The Nature of Realism




                    Intigra Engine     Café Express
                    Kevin Hulsey       Richard Estes, 1975
                                       Oil on canvas

CS348B Lecture 18                    Pat Hanrahan, Spring 2005
Highlighting




               From Gooch and Gooch
 Visualizing Anatomy
 A photographic depiction
    captures the exact
    appearance of the object as
    we actually see it
 Subtle, complex details of
    coloration and texture are
    fully represented, with great
    accuracy


Photograph of the right hip bone (lateral aspect).
Johannes W. Rohen and Chihiro Yokochi.
Color Atlas of Anatomy:
A Photographic Study of the Human Body,
Igaku-Shoin, 1993.
        A drawing offers
        the possibility to
        clarify structural
        or conceptual
        information that
        may be difficult to
        perceive in even
        a very good
        photo.


Color drawing of the same subject.
Sobotta Atlas of Human Anatomy,
11th English edition, vol. 2, edited
by Jochen Staubesand, translated
and edited by Anna N. Taylor,
Urban & Schwarzenberg, 1990.
Perception

Visual cues (space or depth perception)
          Motion
          Shape
          Binocular stereo
          Occlusion and silhouettes
          Linear perspective and foreshortening
          Shading
          Textures
          Shadows
          Aerial perspective: desaturation & blurring
          Transparency
CS348B Lecture 18                         Pat Hanrahan, Spring 2005
      Adaptive histogram                  With glare, contrast, blur




CS348B Lecture 18     P. Debevec and J. Malik   Pat Hanrahan, Spring 2005
Beck Illusion




              From J. Beck, Surface Color Perception, p.156
CS348B Lecture 18                                  Pat Hanrahan, Spring 2005
Material Recognition

People recognize materials more easily under
natural illumination than simplified illumination.




Illusion due to Ted Adelson

CS348B Lecture 18                      Pat Hanrahan, Spring 2005
DeCarlo, Finkelstein, Rusinkiewicz, Santella, Suggestive contours for
conveying shape, SIGGRAPH 2003
From V. Interrante
http://www-users.cs.umn.edu/~interran/texture/index.html
The turning road, Andre Derain




                                  Normally colored objects




     S. Zeki and L. Marini

                                 Abnormally colored objects

				
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