Lecture 18: slide

Interactive Computer Graphics: A Top-Down Approach Using OpenGL (4th Edition)

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1 ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Advanced Graphics Lab Class 18 October 23, 2007 ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 23 – October 23, 2007 Announcements ± Homework 3 is due Sunday ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 23 – October 23, 2007 Halo3 Party ± November 9 (tentatively 9pm – midnight) ± ARTS Lab ± Prizes, fun! Brought to you by ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 23 – October 23, 2007 Last time ± Started talking about texture mapping ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 23 – October 23, 2007 Today ± Texture mapping revisited ± OpenGL vs DirectX ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 23 – October 23, 2007 Texture filtering ± Screen space samples are closer together than texture samples (magnification) – OpenGL provides two reconstruction filters: GL_NEAREST, GL_LINEAR ± Screen space samples are farther apart than texture samples (minification) – Summed area tables – Mipmapping
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2 ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 23 – October 23, 2007 Summed area tables ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 23 – October 23, 2007 Mipmapping ± MIP- multum in parvo (many things in a small place) ± Technique in which to perform pre-computed filtering for minification Space usage 1.3 x more than the standard texture! ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 23 – October 23, 2007 Mipmapping ± Accessing the mipmap ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 23 – October 23, 2007 Problems with mipmapping ± Decimated textures all have a square footprint (isotropic) Here, screen samples in the u direction are more dense than in the v direction!
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Lecture 18: slide - Announcements ECE/CS 433 Introduction...

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