Introduction computer graphics (p1) (đồ họa máy TÍNH SLIDE)

Introduction
Computer Graphics

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Computer Graphics

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Computer graphics deals with all aspects of creating images with a computer

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Hardware
Software
Applications

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Basic Graphics System

Input devices

Output device

Image formed in
Frame Buffer

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Grahpics Areas
User interaction

Image processing

Modeling

Virtual reality

3D scanning
Rendering

Animation

Visualization

Computational
photography
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The Programmer’s Interface

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Programmer sees the graphics system through an interface: Application Programming

Interface (API)

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Object Specification

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Most APIs support a limited set of primitives including

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Points (1D object)
Line segments (2D objects)
Polygons (3D objects)
Some curves and surfaces

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Quadrics
Parametric polynomial

All are defined through locations in space or vertices

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Example
type of object
location of vertex

glBegin(GL_POLYGON)
glVertex3f(0.0, 0.0, 0.0);
glVertex3f(0.0, 1.0, 0.0);
glVertex3f(0.0, 0.0, 1.0);
glEnd();

end of object definition

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Modeling Package

Digital Content Creation

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Raster Graphics

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Image produced as an array (the raster) of picture elements (pixels) in the frame buffer

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Rasterization

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Let talk about pixels

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Pixels are strored as a 1-dimensional array of ints
Each in is formated arcording to Java's standard pixel model

Layout of the pixel array on the display

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Display Technologies

CRT

LCD

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Evolution

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Wire-Frame

Shutterbug: Copyright 1990 Pixar - Rendered by Thomas Williams and H. B. Siegel using Pixar's RenderMan

TM
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Coloring

Shutterbug: Copyright 1990 Pixar - Rendered by Thomas Williams and H. B. Siegel using Pixar's RenderMan

TM

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Hidden Surface Removal

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Constant Rendering

Shutterbug: Copyright 1990 Pixar - Rendered by Thomas Williams and H. B. Siegel using Pixar's RenderMan

TM

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Facet Shading

Shutterbug: Copyright 1990 Pixar - Rendered by Thomas Williams and H. B. Siegel using Pixar's RenderMan

TM

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Smooth Shading

Shutterbug: Copyright 1990 Pixar - Rendered by Thomas Williams and H. B. Siegel using Pixar's RenderMan

TM

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Correct Highlight

Shutterbug: Copyright 1990 Pixar - Rendered by Thomas Williams and H. B. Siegel using Pixar's RenderMan

TM

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Texture & Shadow

Shutterbug: Copyright 1990 Pixar - Rendered by Thomas Williams and H. B. Siegel using Pixar's RenderMan

TM
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Reflection

Shutterbug: Copyright 1990 Pixar - Rendered by Thomas Williams and H. B. Siegel using Pixar's RenderMan

TM

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