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 6 September 6, 2007 ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 6 – September 6, 2007 Last time Started talking about light fields ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 6 – September 6, 2007 Today More on light fields and image formation ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 6 – September 6, 2007 The light-field P 1 α 1 β 1 P 2 α 2 β 2 L(x, y, θ , φ ) source: Photography , by London & Upton ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 6 – September 6, 2007 Light field definition Formally, we define a light field as the radiance at every point in any direction Informally, we can think of radiance as the amount of light in a ray Formally, radiance is the power per unit projected area perpendicular to the ray per unit solid angle in the direction of the ray (units: W/m 2 sr) ECE/CS 433 Introduction to Computer Graphics Pradeep Sen Class 6 – September 6, 2007 Light field parameterization In a static scene with occluders, the light- field is a 5-D function (x, y, z, θ , φ ) . In free-space (no occluders), this turns into a 4-D function (x, y, θ , φ ) source: Photography , by London & Upton
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