Waves of two different frequencies crossing a Poisson disc lattice

[@scrambledmandible]

Quite an effective bandpass filter!

[@leyasep5919]

Alternate title : Nils messes with KZbin's video compression 🙂

[@Ruktiet]

Wtf is everyone’s obsession with pointing out youtube’s compression effects in this giy’s videos?

[@leyasep5919]

@@Ruktiet because this guy really hits corner cases of MPEG/H264/H265 encoding.

[@Ruktiet]

@@leyasep5919 does he now? In what way do you suppose he’s hitting “corner cases”?

[@leyasep5919]

@@Ruktiet I don't suppose, I see it. as for how/why : it's my experience with lossy compression algorithms. A very vast subject that can't be explained in one comment.

[@Ruktiet]

@@leyasep5919 I have background inowledge, I just wonder what you meant by “corner cases”, because, as far as I know, they have universal behavior and so the concept of “corner cases” doesn’t really apply.

[@Hailfire08]

Ah back to the classics!

[@jneal4154]

Wow. This is phenomenal. I think its the best I've seen yet.

[@connoradair]

Wow the codes come a long way Thankyou for your sharing man:)

[@SmolKTN]

Does amplitude make a difference? Also, will the arrangement, size, density and material of barriers alter the result? Would be interesting to see the different results with just a single pulse at different amplitudes too.

[@NilsBerglund]

Amplitude will make no difference, since this is the linear wave equation. Arrangement, size and density do matter, mostly via the ratio between wavelength and distance between obstacles. The material could have an effect on the boundary conditions. Here the b.c. are totally reflecting (Dirichlet).

[@gordonstull1962]

Sphere bubble absorption of localized wave motion, where the waves are in the act of pushing outwardly and the spheres are in the act of pulling small particles in-wardly into the spheres inner sphere-space through density amplification by the organizing absorption of mass. Love your videos!!!

[@osevenninefiver]

Hey, look, it's lighter electrons against the heavier nuclei, going through a super capactior with perforations that holds a charge better because it has integrity and sustainable energy it doesn't like to let go of. Fascinating! The old grey goose is dead, Aunt Mary!

[@SillySussySally]

nice visuals and music bro

[@Grateful.For.Everything]

Really nice feel to that one ✌️🙂

[@maciejmatyka]

Interesting, what if the size of discs would decrease with x-coordinate?

[@NilsBerglund]

Good question. The most important seems to be the distance between obstacles. Decreasing the disc size should allow more energy to pass the barrier, but one sometimes has surprises in these situations.

[@maciejmatyka]

@@NilsBerglund actually what would be the ideal situation? Zero aplitude on the right side with the minimum possible coverage of the space with obstacles?

[@genericalias5756]

Could you do the same simulation with a point source emitting a sum of two different frequencies?

[@evolevil1]

I see here analogue to edge of existence, how energy becomes mass. Bubble with energy inside and mass outside. And pictures on the surface is our reality.

[@stargamerz2332]

but since they arent coherent will we be able to see interference??

[@NilsBerglund]

Interference is quite a general effect. I think the sources before they encounter the lattice can be called coherent.

[@JaredJeyaretnam]

If you measure the decay in amplitude/energy of the waves with penetration distance, would it be an exponential? I’d expect with Anderson localisation that the energy of the waves would die down very rapidly!

[@NilsBerglund]

That sounds reasonable. The older simulation kzbin.info/www/bejne/lZDVpXiBo7h-bLM seems compatible with an exponential decay.

[@hakankosebas2085]

is there any source to learn to make it? I kind of wanna do wave simulation on shadertoys

[@NilsBerglund]

Here is a tutorial: kzbin.info/www/bejne/pn-QmJyVpNJ8jKc

[@hakankosebas2085]

@@NilsBerglund thanks a lot

[@andreykireev71]

Question for Nils. Your simulations are very similar to Ripple Tank Simulation, but clearly more powerful. What software or online services do you use for such wave simulation?

[@NilsBerglund]

I don't use any of these. I develop my own C code, which is run directly on my laptop. The code uses some OpenGL libraries, but apart from that is is essentially made from scratch. The video description contains a link to a GitHub page with the code.

[@andreykireev71]

@@NilsBerglund Thank you very much for your quick response. Unfortunately, I am not a programmer and I am forced to search "ready-to-use" solutions for wave simulations.

[@ubertuna1]

Very cool. Would it be possible for you to list the frequencies of the waves?

[@NilsBerglund]

Do you mean before or after they pass the lattice? Before easy (there are two frequencies related by a factor of 3). After would require something like a Fourier transform.

[@ubertuna1]

@@NilsBerglund Just wanted to know the relationship between the starting frequencies, thanks! Also thankyou for all of these amazing simulations, no joke you have got one of the coolest channels on the whole site!

[@beanieduchet2928]

Hypnotic, Fabulous! Hi from Las Vegas!

[@connormeredith3144]

WOW! One of my favorite so far