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Modeling & Simulating Appearance

Modeling & Simulating Appearance. Models Light Light Sources Shapes Materials Interfaces: Reflection and texture models Medium: Atmospheric scattering models Camera Lens and film Simulation Illumination. The Goals of Rendering. Goals Accurate physical simulation (perfect match)

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Modeling & Simulating Appearance

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  1. Modeling & Simulating Appearance • Models • Light • Light Sources • Shapes • Materials • Interfaces: Reflection and texture models • Medium: Atmospheric scattering models • Camera • Lens and film • Simulation • Illumination

  2. 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

  3. D. Enright, S. Marschner, R. Fedkiw

  4. Ralph Goings

  5. Richard Estes

  6. Richard Estes

  7. The Nature of Realism Intigra Engine Kevin Hulsey Café Express Richard Estes, 1975 Oil on canvas

  8. Highlighting From Gooch and Gooch

  9. 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.

  10. 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.

  11. 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

  12. Adaptive histogram With glare, contrast, blur P. Debevec and J. Malik

  13. Beck Illusion From J. Beck, Surface Color Perception, p.156

  14. Material Recognition • People recognize materials more easily under • natural illumination than simplified illumination. Illusion due to Ted Adelson

  15. DeCarlo, Finkelstein, Rusinkiewicz, Santella, Suggestive contours for conveying shape, SIGGRAPH 2003

  16. From V. Interrante http://www-users.cs.umn.edu/~interran/texture/index.html

  17. The turning road, Andre Derain Normally colored objects S. Zeki and L. Marini Abnormally colored objects

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