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Computer Graphics

Computer Graphics Coms 385 Fall 2003 Introduction Lecture 1 Wed, Aug 27, 2003 The Syllabus Syllabus.html Introduction What are the goals of computer graphics? Realism Information Art In this course, we will most often be concerned with realism. Introduction

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Computer Graphics

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  1. Computer Graphics Coms 385 Fall 2003

  2. Introduction Lecture 1 Wed, Aug 27, 2003

  3. The Syllabus • Syllabus.html

  4. Introduction • What are the goals of computer graphics? • Realism • Information • Art • In this course, we will most often be concerned with realism.

  5. Introduction • The main application areas of computer graphics. • Scientific imaging. • Computer games. • Movies.

  6. Introduction • What are the goals of this course? • To learn the principles of computer graphics. • To learn the issues in computer graphics. • To apply these principles in programs using the OpenGL graphics library.

  7. Introduction • What are not the goals of this course? • To learn OpenGL. • To create complicated data structures. • To learn complicated mathematics.

  8. Introduction • Nevertheless, we will • Learn OpenGL. • Create complicated data structures. • Learn complicated mathematics. • But we will try to keep the second two to a minimum in your programs.

  9. Introduction • What else are not the goals of this course? • To use graphics packages to create graphics (without programming). • Adobe Photoshop. • Maya. • We will learn to program the graphics. • In other words, this is a programming course.

  10. Computer Prerequisites • C++ programming (Coms 261) • Data structures (Coms 262)

  11. Mathematics Prerequisites • Some calculus, maybe. • Some linear algebra. • Vectors • Matrices • We will introduce the necessary mathematics on a need-to-know basis. • A high-school-level knowledge of these topics will probably be sufficient.

  12. Programming Style • Rendering a scene can be computationally intensive. • Yet, for satisfactory animation the scene must be rendered in less than 1/60 sec. (Why?) • Therefore, we place a premium on program efficiency.

  13. Programming Style • This permits us to do things that otherwise might be considered poor programming style. • When deciding how to implement a function, we will choose the method that will execute the fastest, even if it is a bit more complicated or a bit less intuitive than other methods.

  14. Programming Style • We will make generous use of global variables to reduce the number of function parameters passed. • Consequences • Most functions will return void. • Most functions will have few, if any, parameters. • Functions will have “side effects.”

  15. Programming Style • When creating C++ classes, we will often make data members public. • Then we can access them directly without going through inspectors or mutators.

  16. Programming Style • HOWEVER! • Whenever we violate good programming guidelines, we should be able to justify it in terms of program efficiency.

  17. Chapter 1 Introduction to Computer Graphics

  18. Raster Displays • A raster display consists of a rectangular array of picture elements, called pixels. • Each pixel emits a single color. • The color of each pixel is stored in the framebuffer. • The image rendered is the combined effect of these pixels.

  19. Rasterized Lines • A rasterized line appears as a series of pixels in grid positions. • This can produce “the jaggies.”

  20. The Jaggies • For which lines are the jaggies most obvious? • For which lines are the jaggies least obvious? • Antialiasing reduces the effect of the jaggies.

  21. Examples • HSC Display.cpp • FunctionPlotter.exe

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