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Science Forum Index » Optics Forum » have a few queries..
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| surface2air |
 Posted: Sun Feb 24, 2008 4:13 am |
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I'm trying to write a ray tracer and I'm supposed to include
diffraction effect as well as creeping rays. I have been told to look
into Geometrical Theory of diffraction. Can anyone explain this theory
to me in layman terms as my field is computer science and it would be
helpful if you can give some links/papers |
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| Phil Hobbs |
| Posted: Sun Feb 24, 2008 4:20 pm |
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surface2air wrote:
Quote: I'm trying to write a ray tracer and I'm supposed to include
diffraction effect as well as creeping rays. I have been told to look
into Geometrical Theory of diffraction. Can anyone explain this theory
to me in layman terms as my field is computer science and it would be
helpful if you can give some links/papers
You need to get a copy of V. A. Borovikov & B. Ye. Kinber, *Geometrical
Theory of Diffraction*, IEE Electromagnetic Waves Series, V 37,
Institute of Electrical Engineers, London, 1994.
I assume that this ray tracer is intended for rendering rather than lens
design--a POV-Ray rather than a Zemax.
The basic idea of GTD is to improve the accuracy of scattering
calculations from objects large compared with a wavelength, by splicing
together analytically known scattering solutions for e.g. spheres and
triangular edges. You have to account for multiple scatter, but the
basic approach is what underlies stealth technology, for instance.
It's going to be fairly tough without an optics person around, or
someone who does radar cross sections.
Cheers,
Phil Hobbs |
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| AES |
| Posted: Sun Feb 24, 2008 9:21 pm |
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In article <13s3kdeh7dhold9@corp.supernews.com>,
Phil Hobbs <pcdhSpamMeSenseless@pergamos.net> wrote:
Quote:
You need to get a copy of V. A. Borovikov & B. Ye. Kinber, *Geometrical
Theory of Diffraction*, IEE Electromagnetic Waves Series, V 37,
Institute of Electrical Engineers, London, 1994.
Or maybe R. C. Hansen, ed., Geometrical Theory of Diffraction,
Piscataway, New Jersey: IEEE Press (1981)? [IEEE Reprint Collection
series. Has Keller's original paper, and paper by Kouyoumjian from Nov
1974 Proc. IEEE.]
I'd suspect a used cc through amazon would be just a few bucks. |
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