The radiance along all such rays in a region of three-dimensional space illuminated by an unchanging arrangement of lights is called the plenoptic function. Parameterizing a ray in 3D space by position ( x, y, z) and direction ( θ, ϕ). The steradian is a measure of solid angle, and meters squared are used as a measure of cross-sectional area, as shown at right. ![]()
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