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Effects of Global Illumination Approximations on Material Appearance by Jaroslav Křivánek; James A. Ferwerda; Kavita Bala is a Computer Science article available to read on EtoBox.

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Rendering applications in design, manufacturing, ecommerce and other fields are used to simulate the appearance of objects and scenes. Fidelity with respect to appearance is often critical, and calculating global illumination (GI) is an important contributor to image fidelity; but it is expensive to compute. GI approximation methods, such as virtual point light (VPL) algorithms, are efficient, but they can induce image artifacts and distortions of object appearance. In this paper we systematically study the perceptual effects on image quality and material appearance of global illumination approximations made by VPL algorithms. In a series of psychophysical experiments we investigate the relationships between rendering parameters, object properties and image fidelity in a VPL renderer. Using the results of these experiments we analyze how VPL counts and energy clamping levels affect the visibility of image artifacts and distortions of material appearance, and show how object geometry and material properties modulate these effects. We find the ranges of these parameters that produce VPL renderings that are visually equivalent to reference renderings. Further we identify classes of sh

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Author

Jaroslav Křivánek; James A. Ferwerda; Kavita Bala

Publisher

ACM

Published

2010

Language

EN

Field

Computer Science (Physical Sciences)