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This page could use a review by someone who knows more about this than I do.-- Srleffler 02:51, 3 March 2006 (UTC)
I'm not sure about that new image. It's very nice, but Wikipedia:Profanity seems to say that images that may be objectionable should be used " if and only if their omission would cause the article to be less informative, relevant, or accurate, and no equally suitable alternatives are available." While the image is clearly relevant in that it shows optical caustics, I'm not sure one can argue that its omission would weaken the article, or that no equally suitable images of caustics are available (there being such an image on the article already). Wikipedia is not censored, but that doesn't mean that everything is always appropriate and encyclopedic. -- Srleffler 19:33, 23 July 2006 (UTC)
Gone. HighInBC 21:21, 23 July 2006 (UTC)
Such concentration of light, especially sunlight, can burn—hence the name. Something about the ethymology? -- Abdull 12:27, 5 August 2006 (UTC)
Wolfram says [1] "The cardioid is a degenerate case of the limaçon. It is also a 1-cusped epicycloid (with r==r) and is the catacaustic formed by rays originating at a point on the circumference of a circle and reflected by the circle." But User:Pne changed it to Nephroid. Which is correct? Both, depending on where the light comes from? Dicklyon 17:43, 16 September 2006 (UTC)
I reverted your original replacement of two images yesterday (but not their re-addition today). As I said in my edit summary, I reverted because the images you removed both illustrated specific points discussed in the text—the first shows a caustic with a nephroid shape, which is important in the theory of caustics and is of some mathematical interest. The second image illustrates the simulation of caustics in computer graphics. The images you added are beautiful, but not as valuable to the text of the article as it stands. Pictures on Wikipedia must be more than merely decorative.
I still object to adding both of these images to the article. This is a short article, with a long history of people adding pretty pictures of caustics to it. The article is just not long enough to support everyone's favourite picture of a caustic. My suggestion is that we keep the picture of the fish and caustic, because it does illustrate how caustics can be seen in nature, which is not well represented in the article now. The photo with the eel, on the other hand, does not seem to add sufficient value to the article. It should be removed. I added both images to the collection Caustic (optics) on Wikipedia Commons, however. -- Srleffler 04:26, 22 September 2007 (UTC)
I'm concerned about the paragraph on rainbows. Are rainbows actually considered to be caustics? I would like to see a citation to a source that describes them as such.-- Srleffler ( talk) 03:16, 20 July 2009 (UTC)
The most familiar caustic is surely the rainbow, caused by the scattering of light from raindrops in the sky. In brief, the primary rainbow arises from light rays which are twice refracted and once totally internally reflected from a droplet. The scattering angle for these rays can never be less than a certain minimum value. Thus an observer on the ground sees essentially no light above the corresponding direction in the sky. The curve defined in the sky in this way is a directional caustic. Since the index of refraction of water varies slightly with wavelength in the visible, the caustics for different wavelength are formed at slightly different angles, leading to the familiar separation of colors seen in the sky.
I was concerned, too. But books to back it up are easy to find: [2]. Someone needs to cite an appropriate one. Dicklyon ( talk) 04:01, 20 July 2009 (UTC)
I started in on a rewrite of the "Differentiable inverse rendering" section to clean up the incorrect-person and sentence structure issues, but I quickly found myself leaning towards "delete". The first paragraph essentially just repeats the definition of caustic engineering already given in the section above ("Caustic engineering describes the process of solving the inverse problem to computer graphics"), but in a much more wordy way. It then starts into a presentation of one specific technique, based on some conference paper. I'm not sure who the audience for this would be. It is both too technical and too incomplete to be useful. If there is no objection, I'll just delete the whole section in a day or two.-- Srleffler ( talk) 04:00, 19 January 2020 (UTC)
I removed the section on pixel art. This seems to be a hypothetical application proposed in one paper. The coverage in the article was undue. The mathematical description given seemed likely to be useful to no one. Also, the first sentence was copied verbatim from the cited source, raising copyright violation questions. -- Srleffler ( talk) 22:36, 26 January 2020 (UTC)
Many parts of the caustic engineering section are too technical, and just not well enough explained to be useful. The sections delve into the mathematics of how to solve the problem without sufficient explanation. The only readers who will be able to follow this material as it is written are those who already know the subject, and they are unlikely to gain anything from reading it here. Wikipedia is an encylopedia, not a textbook. Material that is this opaque doesn't belong here. Technical material can work, but it has to be clear enough to be useful to somebody.-- Srleffler ( talk) 03:42, 29 January 2020 (UTC)
Otherwise we cannot elaborate his ideas. — Preceding unsigned comment added by 2A02:587:4111:63B1:4C7:98E6:6EEE:4627 ( talk) 03:54, 18 July 2020 (UTC)
![]() | This article is rated C-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||
|
This page could use a review by someone who knows more about this than I do.-- Srleffler 02:51, 3 March 2006 (UTC)
I'm not sure about that new image. It's very nice, but Wikipedia:Profanity seems to say that images that may be objectionable should be used " if and only if their omission would cause the article to be less informative, relevant, or accurate, and no equally suitable alternatives are available." While the image is clearly relevant in that it shows optical caustics, I'm not sure one can argue that its omission would weaken the article, or that no equally suitable images of caustics are available (there being such an image on the article already). Wikipedia is not censored, but that doesn't mean that everything is always appropriate and encyclopedic. -- Srleffler 19:33, 23 July 2006 (UTC)
Gone. HighInBC 21:21, 23 July 2006 (UTC)
Such concentration of light, especially sunlight, can burn—hence the name. Something about the ethymology? -- Abdull 12:27, 5 August 2006 (UTC)
Wolfram says [1] "The cardioid is a degenerate case of the limaçon. It is also a 1-cusped epicycloid (with r==r) and is the catacaustic formed by rays originating at a point on the circumference of a circle and reflected by the circle." But User:Pne changed it to Nephroid. Which is correct? Both, depending on where the light comes from? Dicklyon 17:43, 16 September 2006 (UTC)
I reverted your original replacement of two images yesterday (but not their re-addition today). As I said in my edit summary, I reverted because the images you removed both illustrated specific points discussed in the text—the first shows a caustic with a nephroid shape, which is important in the theory of caustics and is of some mathematical interest. The second image illustrates the simulation of caustics in computer graphics. The images you added are beautiful, but not as valuable to the text of the article as it stands. Pictures on Wikipedia must be more than merely decorative.
I still object to adding both of these images to the article. This is a short article, with a long history of people adding pretty pictures of caustics to it. The article is just not long enough to support everyone's favourite picture of a caustic. My suggestion is that we keep the picture of the fish and caustic, because it does illustrate how caustics can be seen in nature, which is not well represented in the article now. The photo with the eel, on the other hand, does not seem to add sufficient value to the article. It should be removed. I added both images to the collection Caustic (optics) on Wikipedia Commons, however. -- Srleffler 04:26, 22 September 2007 (UTC)
I'm concerned about the paragraph on rainbows. Are rainbows actually considered to be caustics? I would like to see a citation to a source that describes them as such.-- Srleffler ( talk) 03:16, 20 July 2009 (UTC)
The most familiar caustic is surely the rainbow, caused by the scattering of light from raindrops in the sky. In brief, the primary rainbow arises from light rays which are twice refracted and once totally internally reflected from a droplet. The scattering angle for these rays can never be less than a certain minimum value. Thus an observer on the ground sees essentially no light above the corresponding direction in the sky. The curve defined in the sky in this way is a directional caustic. Since the index of refraction of water varies slightly with wavelength in the visible, the caustics for different wavelength are formed at slightly different angles, leading to the familiar separation of colors seen in the sky.
I was concerned, too. But books to back it up are easy to find: [2]. Someone needs to cite an appropriate one. Dicklyon ( talk) 04:01, 20 July 2009 (UTC)
I started in on a rewrite of the "Differentiable inverse rendering" section to clean up the incorrect-person and sentence structure issues, but I quickly found myself leaning towards "delete". The first paragraph essentially just repeats the definition of caustic engineering already given in the section above ("Caustic engineering describes the process of solving the inverse problem to computer graphics"), but in a much more wordy way. It then starts into a presentation of one specific technique, based on some conference paper. I'm not sure who the audience for this would be. It is both too technical and too incomplete to be useful. If there is no objection, I'll just delete the whole section in a day or two.-- Srleffler ( talk) 04:00, 19 January 2020 (UTC)
I removed the section on pixel art. This seems to be a hypothetical application proposed in one paper. The coverage in the article was undue. The mathematical description given seemed likely to be useful to no one. Also, the first sentence was copied verbatim from the cited source, raising copyright violation questions. -- Srleffler ( talk) 22:36, 26 January 2020 (UTC)
Many parts of the caustic engineering section are too technical, and just not well enough explained to be useful. The sections delve into the mathematics of how to solve the problem without sufficient explanation. The only readers who will be able to follow this material as it is written are those who already know the subject, and they are unlikely to gain anything from reading it here. Wikipedia is an encylopedia, not a textbook. Material that is this opaque doesn't belong here. Technical material can work, but it has to be clear enough to be useful to somebody.-- Srleffler ( talk) 03:42, 29 January 2020 (UTC)
Otherwise we cannot elaborate his ideas. — Preceding unsigned comment added by 2A02:587:4111:63B1:4C7:98E6:6EEE:4627 ( talk) 03:54, 18 July 2020 (UTC)