INTRO TO COMPUTER GRAPHICS TEXT EDWARD ANGEL: EDITION 5 CS770/870 www.ccom.unh.edu/vislab.

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Presentation transcript:

INTRO TO COMPUTER GRAPHICS TEXT EDWARD ANGEL: EDITION 5 CS770/870

Metacognition Learning by doing Notes Discussion Assignments Tests Sleep and distributed learning (in time)

Read Chapters 1, 2 and 8 What is Graphics for? Visualization Design Animation UIs

Data visualization (visLab)

Show TrackPlot You will learn everything needed to do something like this.

Design

Animation

Light and the Environment

User Interfaces

Course organization

Pinhole camera and Perspective geometry 3D (world) -> 2D screen Derive it. Write equations to show how something appears on a screen X,Y,Z (coordinate system) x,y,z (world coords of a point) x p, y p, z p (screen coords of a point) d: distance from origin to screen

Other aspects of the pinhole camera Camera Field of view  Theta = arctan(w/2d) – derive it. Depth of focus (not with a pinhole) Projective geometry – all the rest is translations, rotations and scales.

The human eye Three colors (Because of cones)

Graphics Pipeline Rasterization Interpolation Texture Color blending Geometry Rotations Translations Scales Clipping

Assignment 1 Simple video game Paddle

OpenGL and glut OpenGl based on sgi gl. A widely used standard Alternative is direct X Based on the pipleline architecture Giving way to “shaders” GPU programs  Low level mostly pixel based  Very fast e.g. 128 processors  we will not cover these methods because too low level

Glut Graphics library utility toolkit. Provides windows, simple menus. (and removes the need for a lot of ugly code)

GlutCB Mouse GlutCB Keyboard GlutCB Menus Main Setup callbacks Glut Hand control to OS OS

The opengl pipeline (again) Graphics App Transfor m Translate Rotate scale ProjectClipRasterize What? -- mostly polygons

Graphics Primitives glBegin( );  GL_LINES, GL_TRIANGLES, GL_POINTS glColor(); glVertex( a list of vertices ); glEnd(); Note there are also pixel-based operations that Bypass the frame buffer.