[HN Gopher] Using the moire effect to show different arrows to e...
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Using the moire effect to show different arrows to each observer
(2018)
Author : raldi
Score : 117 points
Date : 2024-09-01 16:06 UTC (6 hours ago)
(HTM) web link (www.popularmechanics.com)
(TXT) w3m dump (www.popularmechanics.com)
| hammock wrote:
| How far can this be taken?
|
| Can you create a lenticular-type image with this?
|
| Can you use a variable moire effect to create motion graphics?
| taejo wrote:
| > Can you use a variable moire effect to create motion
| graphics?
|
| Yes! https://www.creativebloq.com/animation/moire-effect-
| book-714...
| hyperific wrote:
| https://actu.epfl.ch/news/harnessing-the-moire-effect-to-mak...
| msk-lywenn wrote:
| Buenzli/Demodays OHP (overhead projetor) competition has many
| of those
|
| https://www.youtube.com/watch?v=6G5rTavyx7A
|
| https://www.youtube.com/watch?v=AZ39obFzaQs
|
| https://www.youtube.com/watch?v=LCIsIfEOEI8
| IshKebab wrote:
| That's equal parts hilarious and impressive. At least the
| first one. Some of the others were hilarious and
| embarrassing:
|
| https://youtu.be/LCIsIfEOEI8?t=134
| nicd wrote:
| This also reminds me of Lumii (now Fathom), which is an MIT
| media lab spin-out that prints multiple inkjet layers to create
| a 3D effect:
|
| https://www.inkworldmagazine.com/contents/view_online-exclus...
| dahart wrote:
| Tons of interesting applications
| https://en.wikipedia.org/wiki/Moir%C3%A9_pattern#Implication...
|
| I saw a good talk a couple decades ago where the speaker clued
| us into how with moire interference patterns, translation of
| one pattern turns into translational motion of the interference
| pattern that is 90 degrees offset (e.g., move one grating to
| the left/right, and the result moves up & down), and a rotation
| of one grating against another becomes scaling of the resulting
| pattern. He had lots of neat examples of animation, hidden
| designs, magnification, moving text, morphing images, etc. I
| couldn't find a link immediately, but he was working on a
| textbook explaining the theory of generalize Moire patterns.
| With just a little searching, I do see lots of that kind of
| stuff describing mathematical and perceptual properties and
| various uses of Moire effects.
| diggan wrote:
| What's the difference between the Moire effect and "Lenticular
| printing"? https://en.wikipedia.org/wiki/Lenticular_printing
|
| The effect seems to be very similar, but the Wikipedia page I
| linked doesn't describe itself as using the Moire effect.
| downboots wrote:
| In Moire patterns the lines are not parallel (they don't even
| have to be lines), and there is no lens. But now I'm tempted to
| combine the effects.
| cwillu wrote:
| This is more or less how airport glide slope indicators work.
| knodi123 wrote:
| https://en.wikipedia.org/wiki/Precision_approach_path_indica...
| dublinben wrote:
| This is nothing but blogspam of the embedded Tom Scott video:
| https://www.youtube.com/watch?v=d99_h30swtM. This article adds
| nothing that is not already included in the video itself.
| jimmaswell wrote:
| It is nice to get a good gist without committing to a video
| sometimes.
| lisper wrote:
| Unless is a Tom Scott video. Those are almost always worth
| the investment.
| serf wrote:
| some people just don't watch youtube.
|
| someone that's a quarter-of-the-way proficient at speed
| reading can read a short article like this in seconds --
| without the time investment or the need to buffer video
| data to read the transcript.
|
| every media has a place, generally speaking the trivia and
| background included in a YT video is interesting -- but in
| the end it's Jeopardy answers and brain-candy for me 90% of
| the time.
| omoikane wrote:
| I use the "show transcript"[1] function for that.
|
| [1] In the web (desktop) version of youtube, if you expand
| the description, there is a "show transcript" button near the
| bottom. Not sure about mobile or other versions.
| planetpluta wrote:
| I appreciate being able to quickly skim an article rather than
| watch a video - especially when in public without headphones!
| niccl wrote:
| definitely agree. the information density of well written
| article (or even 'blog- spam, in this case) is far higher
| than almost any video
| lucideer wrote:
| I don't think you can count something as blogspam unless it's
| rehashing something in the same medium as itself. Video to text
| is fine imo.
| fsckboy wrote:
| spam is advertising; blogspam is a blog that appears to be
| about something, but it's not really (and as a result, it's
| very thin, regurgitated, etc), it's an attempt to lure you
| into a relationship with a predator
|
| this particular article is not a good replacement for the
| video, it adds nothing, it subtracts some things... but the
| video also doesn't say all you want to hear either. The
| article could have used a small animated gif like one might
| see in a wikipedia article. It would be very nice to see what
| simple patterns when overlaid would give you >> and << from
| different angles.
| bookofjoe wrote:
| I never watch embedded YouTube videos so this is definitely NOT
| blogspam for people of my ilk.
| chinathrow wrote:
| I think OP means the blog does not add value compared to the
| original video everyone can watch on YT directly.
| bookofjoe wrote:
| Ah. Can... but prefer not to in my case. See, for example:
|
| https://moglen.law.columbia.edu/LCS/bartleby.pdf
| al_borland wrote:
| I threw this in some AI to have it summarized. I'm not
| sure what this has to do with watch watching videos on
| YouTube. Care to explain your key point, rather than
| hoping people can glean it from a 30 page metaphor?
| bookofjoe wrote:
| I would prefer not to.
| ranger_danger wrote:
| Not everyone can watch youtube videos, it could be blocked
| in your country or they could be blind for example, and I'm
| sure there's more reasons. Some people also just prefer to
| read instead.
| raldi wrote:
| I'm cool with having that link swapped in.
| IshKebab wrote:
| I mean in fairness the 3:53 video is about 3 minutes longer
| than necessary.
| darajava wrote:
| Yes but if OP posted the video it would have been killed by
| HN's filters.
| mattyturner wrote:
| I used to walk past that very same light from time to time and
| wonder what it was used for around 20 years ago. Thank you
| internet/HN!
| xipho wrote:
| There is an concept in this video that perfectly encapsulates why
| taxonomists (in this case those who describe Earth's
| biodiversity) are so critical, and why their work has the impact
| it does. The exercise is left to the reader...
| thih9 wrote:
| Related, "An Evaluation of the Inogon Leading Mark"[1]:
|
| > Responses from the field evaluation were generally negative,
| mostly because the device was perceived to have too short a
| detection range for the Constable Hook Channel. It is recommended
| that the device be considered as a candidate range light for very
| short range applications.
|
| [1]: https://apps.dtic.mil/sti/citations/ADA168108
| cypherpunks01 wrote:
| _When a grid 's misaligned_
|
| _With another behind_
|
| _That 's a moire_
| dredmorbius wrote:
| Credit where due: <https://www.xkcd.com/1814/>
| red_admiral wrote:
| The older way of doing this is simply to have several pillars in
| line, each one a bit higher up than the previous one as you move
| away from the shore. I think they're usually painted white with a
| red band or something.
|
| From a ship, if you see the pillars in a straight line ahead of
| you, you're in the channel; if the rear pillar is to the left of
| the front one from your viewpoint you're too far left.
|
| The vertical version of this is the visual approach indicator for
| aircraft: red and white pairs of lights with flaps at different
| angles so that if you're too high, you see all white, and if
| you're too low all red. On the exact glide path you see both red
| and white.
| stn8188 wrote:
| This is the method I've always seen here in the US, where we
| call them range lights [0]. There are lights for night
| alignment and striped boards for daytime. Many years ago I used
| to maintain these systems in the Caribbean and the Long Island
| Sound with the US Coast Guard.
|
| [0] https://en.m.wikipedia.org/wiki/Leading_lights
| nobodyknowin wrote:
| We do the same concept in night diving. Set a glow stick with a
| pie tin low, and another high behind and above it.
|
| Then when you come up from the dive you can see which way you
| need to swim along shore to exit where you entered.
| mensetmanusman wrote:
| Once you know about this effect, you see it everywhere.
|
| No one wears finely striped shirts for movies because of it.
| ranger_danger wrote:
| >it will always display an arrow or series of arrows (sometimes
| strange, distorted ones) pointed in the direction you want them
| to go
|
| How does it know which direction is correct?
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(page generated 2024-09-01 23:00 UTC)