CS348B:%20Image%20Synthesis

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CS348B Image Synthesis

• Goal How to generate realistic images?
• Applications
• Movies
• Interactive entertainment
• Industrial design
• Architecture
• Showcase products
• Cultural heritage
• Holy Grail Virtual reality

Final Fantasy
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Modeling Simulating Appearance

• Models
• Light and color
• Light sources
• Shapes
• Materials
• Interfaces Reflection and texture models
• Medium Atmospheric scattering models
• Cameras
• Lens and film
• Simulation
• Illumination

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History Geometric Aspects First

• Transformation/clipping and the graphics pipeline
• Evans and Sutherland
• Hidden line and surface algorithms
• Sutherland, Sproull, Shumacker

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History Simple Shading

• Simple shading and texturing
• Gouraud Þ interpolating colors
• Phong Þ interpolating normals
• Blinn, Catmull, Williams Þ texturing

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History Optical Aspects Second

• Reflection and texture models
• Cook and Torrance Þ BRDF
• Perlin Þ Procedural textures
• Cook, Perlin Þ Shading languages
• Illumination algorithms
• Whitted Þ Ray tracing
• Cohen, Goral, Wallace, Greenberg, Torrance
• Nishita, Nakamae Þ Radiosity
• Kajiya Þ Rendering equation

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Lighting
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Lighting Simulation

• The Rendering Equation
• Given a scene consisting of geometric primitives
  with material properties and a set of light
  sources, compute the illumination at each point
  on each surface
• Challenges
• Primitives complex lights, materials, shapes
• Infinite number of light paths
• How to solve it?
• Radiosity Finite element
• Ray tracing Monte Carlo

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Lighting Example Cornell Box
Hard Shadows
Caustics
Indirect Illumination
Surface Color
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Lighting Example Diffuse Reflection
Surface Color
Diffuse Shading
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Lighting Example Shadows
No Shadows
Shadows
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Lighting Example Soft Shadows
Hard Shadows Point Light Source
Soft Shadows Area Light Source
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Radiosity Indirect Illumination
Simulated
Program of Computer Graphics Cornell University
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Early Radiosity
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Early, Early Radiosity
Parry Moon and Domina Spencer (MIT), Lighting
Design, 1948
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Early DiffuseGlossy
Tribute to Vermeer Program of Computer Graphics,
Cornell
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Lighting Effects Glossy Materials
Hard Shadows
Soft Shadows
Caustics
Indirect Illumination
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Caustics
Jensen 1995
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Complex Indirect Illumination
Mies Courtyard House with Curved Elements
Modeling Stephen Duck Rendering Henrik Wann
Jensen
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Radiosity Turing Test
Measured
Simulated
Program of Computer Graphics Cornell University
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Materials
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Classic Computer Graphics Model
Plastic
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Classic Computer Graphics Model
Brushed Copper
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Material Taxonomy
RenderMan
Plastic Shiny Plastic
Rough Metal Shiny Metal
Matte
From Apodaca and Gritz, Advanced RenderMan
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Shadows on Rough Surfaces
With self-shadowing
Without self-shadowing
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Translucency
Surface Reflection
Subsurface Reflection
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Water Flows on the Venus
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Patinas
A Sense of TIme
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Virtual Actors Faces
Jensen, Marschner, Levoy, Hanrahan
Final Fantasy SquareUSA
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Virtual Actors Hair
Black
Brown
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Coupling Modeling Rendering
Fedkiw, Stam, Jensen 2001
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Clouds and Atmospheric Phenomena
Hogum Mountain Sunrise and sunset
7am
9am
Modeling Simon Premoze William
Thompson Rendering Henrik Wann Jensen
630pm
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(No Transcript)
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The Everyday World
Troy Maxwell-Hanrahan
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Interdisciplinary

• Computer science
• Computational geometry
• Software engineering
• Physics
• Radiometry and light fields
• Bidirectional reflectance distribution function
• Radiative transport
• Mathematics
• Integral equations
• Monte Carlo and finite element methods
• Perception
• Art