Rendering Wave Effects with Augmented Light Field

Ray–based representations can model complex light transport but are limited in modeling diffraction effects that require the simulation of wavefront propagation. This paper provides a new paradigm that has the simplicity of light path tracing and yet provides an accurate characterization of both Fre...

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Bibliographic Details
Published in:Computer graphics forum Vol. 29; no. 2; pp. 507 - 516
Main Authors: Oh, Se Baek, Kashyap, Sriram, Garg, Rohit, Chandran, Sharat, Raskar, Ramesh
Format: Journal Article
Language:English
Published: Oxford, UK Blackwell Publishing Ltd 01.05.2010
Subjects:
Computer graphics
Computer simulation
Diffraction
Electrons
I.3.6 [Computer Graphics]: Methodology and Techniques-Graphics Data Structures and Data Types
I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism-Raytracing
Image processing systems
Light
Mathematical models
Radiance
Rendering
Shaders
Systems development
Transformers
Wave propagation
ISSN:0167-7055, 1467-8659
Online Access:Get full text
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Summary:Ray–based representations can model complex light transport but are limited in modeling diffraction effects that require the simulation of wavefront propagation. This paper provides a new paradigm that has the simplicity of light path tracing and yet provides an accurate characterization of both Fresnel and Fraunhofer diffraction. We introduce the concept of a light field transformer at the interface of transmissive occluders. This generates mathematically sound, virtual, and possibly negative‐valued light sources after the occluder. From a rendering perspective the only simple change is that radiance can be temporarily negative. We demonstrate the correctness of our approach both analytically, as well by comparing values with standard experiments in physics such as the Young's double slit. Our implementation is a shader program in OpenGL that can generate wave effects on arbitrary surfaces.
Bibliography:ark:/67375/WNG-MWRGPWK5-4
ArticleID:CGF1620
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SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0167-7055
1467-8659
DOI:10.1111/j.1467-8659.2009.01620.x