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Computer Graphics 2013
1. INTRODUCTIONHongxin Zhang
State Key Lab of CAD&CG, Zhejiang University
2013-09-0913年9月10⽇日星期⼆二
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Why study computer graphics?
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13年9月10⽇日星期⼆二
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13年9月10⽇日星期⼆二
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13年9月10⽇日星期⼆二
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13年9月10⽇日星期⼆二
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
Mobile Graphics
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13年9月10⽇日星期⼆二
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Can we give a definition for computer graphics?
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
One of many different descriptions
- The science and technology of imaging the world in pixels, such that it provides the real experience (looks real, sounds real, feels real)
Computer Graphics
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And last …
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- The pixel has only two properties:
- area of the pixel is fixed
- color of the pixel is set under program control
- Image: array of pixels
Pixel Representation Problem
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
recommended description
- The science and technology of modeling , processing and displaying objects in the world in a computer
Computer Graphics
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
Computer Graphics
- Modeling
- Animation (simulating)
- Rendering (displaying)
Three Fundamental Tasks
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- Modeling the World (World Representation)
- Simulating the behavior of objects in the world
- Displaying the World
- Geometry and Physics are the traditional tools
Three Fundamental Tasks
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- Digital Images
- 3D Geometric Objects (Graphics)
- Symbolic Descriptions
- Question:
- Advantages and disadvantages ?
Different Digital Representations of the World
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- Digital Images
- 3D Geometric Objects (Graphics)
- Symbolic Descriptions
- Question:
- Difference?
- Advantages and disadvantages ?
Different Digital Representations of the World
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- find appropriate data structure to represent the object
Point3D {double x;double y; double z;
}
Cuboid {Point3D location;double x;double y;double z;
}
Graphics Representation
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- Three very important and rather complex attributes:
- complex shape (desk, tree, water, animal, people)
- visual look or appearance due to lighting effects
- dynamic behavior due to interaction with other elements of the world -- movement, sound, elastic effects, ...
World Representation Problem
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Computer Graphics @ ZJU Hongxin Zhang, Fall 201212
- Modeling the World (World Representation)
- Simulating the behavior of objects in the world
- Displaying the World
- Geometry and Physics are the traditional tools
Three Fundamental Tasks
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Computer Graphics @ ZJU Hongxin Zhang, Fall 201214
- Modeling the World (World Representation)
- Simulating the behavior of objects in the world
- Displaying the World
- Geometry and Physics are the traditional tools
Three Fundamental Tasks
13年9月10⽇日星期⼆二
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- I/O of Computer Graphics
- Input : graphics : object (shape, material,...)
- Output : image : array of pixels (RGB)
Displaying the World
3D object ImageDisplay or Rendering
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- Digital Images
- 3D Geometric Objects (Graphics)
- Symbolic Descriptions
- Region of Object in an Image
Different Digital Representations of the World
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- Image Processing
- Image⟹image, image⟹region
- Pattern Recognition
- Image⟹symbolic descriptions
- Computer Vision
- Image⟹graphics
- Computer Graphics
- Graphics⟹image, graphics⟹graphics
Visual Computing Fields
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- Use is all pervasive (No computer application domain untouched by Computer Graphics)
- CAD
- GIS
- Movie, Animation
- Game
- Scientific visualization
- Virtual Reality
- User interface
Computer Graphics Applications
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
2D Drawing(AutoCAD)
3D modeling(Pro/E, UG, CATIA)
CAM
CAE
Computer Aided DrawingDesign
Computer Graphics Applications
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
GIS: Geography information system
Computer Graphics Applications
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
Visualization
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
Virtual Reality
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- 1962 : Sutherland’s Sketchpad
- 1970s: Special Hardware
- 1980s: Raster Graphics
- 1990s: Reality Engines
- 2000s: 3D acceleration
Technology Developments
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- Basics - Transformations and Synthetic Camera for Viewing the World
- Modeling techniques and tools - Meshes, Surfaces and Solid Objects
Topics Addressed in this Module
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Parallel Projection13年9月10⽇日星期⼆二
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Perspective Projection
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- Rendering techniques - visibility computation, illumination models, realistic imaging algorithms
Topics Addressed (contd)
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13年9月10⽇日星期⼆二
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13年9月10⽇日星期⼆二
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Texture Mapping (Only Brief Overview)
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13年9月10⽇日星期⼆二
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13年9月10⽇日星期⼆二
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13年9月10⽇日星期⼆二
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13年9月10⽇日星期⼆二
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13年9月10⽇日星期⼆二
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Computer Graphics @ ZJU Hongxin Zhang, Fall 2012
- Advanced modeling and rendering methods
- complex lighting effects,
- natural objects (fractals), and
- volumetric objects
Topics Not Addressed
13年9月10⽇日星期⼆二
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Museum simulation with progressive radiosity by Eric Chen, Michael Cohen, 1989
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fractal images13年9月10⽇日星期⼆二
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© Ken Musgrave
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3D Graphics and Visualization
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Non-Photorealistic Rendering
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© Barbara J. Meier(96)
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