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 2 August 23, 2007 ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 2 – August 23, 2007 Last time ± Preliminaries on raster images, color ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 2 – August 23, 2007 Today ± Light, vision, and color ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 2 – August 23, 2007 Light ± Fundamentally, 3-D computer graphics has to simulate the flow of light around a scene ± So we need to know a little about light ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 2 – August 23, 2007 What is light? ± Light is electromagnetic radiation at a wavelength that is visible to the eye ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 2 – August 23, 2007
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2 ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 2 – August 23, 2007 What is light? ± Light is electromagnetic radion at a wavelength that is visible to the eye ± Has a finite speed ± Energy: E = hf ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 2 – August 23, 2007 Basic radiometry ± Radiometry – the science of the physical measurement of electromagnetic energy ± Radiant flux ( Φ ) – amount of energy passing through a region of space per unit time (e.g. the power through a region of space). units: J/s or W ± Irradiance (E) – Flux per unit area. units: W/m 2 ± Intensity (I) – Flux per unit solid angle. I = d Φ /d ω . Units: W/sr ± Radiance (L) – Flux density per unit solid angle per unit projected area. L = d 2 Φ /d ω dA . units: W/sr m 2 ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 2 – August 23, 2007 ± Irradiance (E) – Flux per unit area. units: W/m 2 ± E.g. power per unit area ± Inverse square law ± Lambert’s law Irradiance θ A A cos( θ ) E 1 = Φ /A E 2 = Φ /(A cos( θ )) = E 2 cos( θ )
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Lecture 2 - Last time ECE/CS 433 Introduction to Computer...

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