Dweets awesomed by u/flexelektro

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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    u(t) is called 60 times per second.
    t: Elapsed time in seconds.
    S: Shorthand for Math.sin.
    C: Shorthand for Math.cos.
    T: Shorthand for Math.tan.
    R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5)
    c: A 1920x1080 canvas.
    x: A 2D context for that canvas.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Opposites

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jylikangas

remix of d/18597 by u/pavel

function u(t) {

for(i=999;i--;x.fillRect(~x.setTransform(s=2e4/i,T(a=i+60*t),9,3*s,1500-i+9*s*C(a),540+8*s*S(a)),0,2,1))x.fillStyle=R(v=99-S(i/99)*80,v,v*2)

May 7 2020 9:44 AM UTC

}// 140/140

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Ice #cavern - all credit to pavel!

u/KilledByAPixel

🧊👍
u/katkip

wow

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KilledByAPixel

function u(t) {

eval(unescape(escape`𭱩𭁨𚁸𚑦𫱲𚁦𪑬𫁒𩑣𭀨𜀬𜀬𨰮𭱩𩁴𪁼👪🐲𞀬𜡥𜰩𞱪𛐭𞱦𪑬𫀨𭁲𨑮𬱦𫱲𫐨𜐮𜐬𜀬𜀬𛐱𛠰𝐬𜀬𜐰𞐰𚐩𚑦𫱲𚁢𩑧𪑮𤁡𭁨𚁩🐳𜠩𞱩𛐭𞱦𪑬𫁓𭁹𫁥👒𚁶🐲𝐵𛑪𚠹𛁶𚠲𛁶𚠴𛀮𞐩𚑬𪑮𩑔𫰨𚁩𛑴𙐱𚐪𝰰𛐹𞐬𪐦𙡩🀳𜐿𤰨𚁩𚱴𯀰𚐪𚡪𚐪𜰹𞐺𜀩`.replace(/u../g,'')))

May 4 2020 5:08 AM UTC

}// 139/140

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Ice #Cavern 🧊

u/katkip

Looks very good!
u/joeytwiddle

chilly

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pavel

remix of d/11930 by u/pavel

function u(t) {

with(x)for(i=-6*t%1;i++<66;fill())for(beginPath(fillStyle=R(8*i,4*i),j=36);--j;arc(960,h+h*S(3*t)**2/i,h/i*(9+C(~~i+6*t^j)),b=9+j/9,b))h=777

May 2 2020 4:35 AM UTC

}// 140/140

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Walking through a #cavern

Show more comments…
u/KilledByAPixel

🤯 genius
u/KilledByAPixel

Looped! https://twitter.com/KilledByAPixel/status/12…
u/sigveseb

Wooow sweet!
u/aleamb

yeah!
u/sigveseb

Really nice colors
u/jick

Holy cow, wow!
u/Xen

sexy!
u/katkip

aannd we have a winner!
u/KilledByAPixel

https://www.reddit.com/r/perfectloops/commen…
u/pavel

the gif is very blurry
u/KilledByAPixel

HD gif for you - https://www.dropbox.com/s/u3wbakb6e4sm00y/pa…
u/Qwitter

Wow!
u/vain

Who needs longer shaders? ;-) Real DemoScene feeling

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pavel

function u(t) {

for(let i=2e3,f=(x,n,c=8-(t+6)*n)=>~n&(x*x*n*n+(8+(t-12)*n)**2+c*c-5)**2/16+c*c>1?f(x,n+=.002):c;i--;)x.fillRect(i,t*180,f(i/135-7,.7),3)

Apr 23 2020 7:27 AM UTC

}// 137/140

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Actually #raytracing a #torus using ray marching

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u/Xen

Sweeet!
u/tomxor

Yes! we need more explicit surfaces on dwitter :)
u/Odog8

which expression is the DFT?
u/tomxor

I'm confused... this isn't explicit? it recurses.
u/pavel

This recurses just to advance ray length.
u/pavel

The closed form expression is x*x*n*n+(8+(t-12)*n)**2+c*c-5)**2/16+c*c-1 where c=8-(t+6)*n and n is the free variable.
u/tomxor

Ah, so is this technically ray casting? I have to ask because I still don't intuitively get all of the math.
u/tomxor

Sorry I meant ray marching
u/pavel

Yes. The math constructs a ray from (0,8,8) looking at (0,0,0), varied a bit depending on the pixel being drawn, its length is a function of n. I plug this into the equation for a torus and increment n from .7 to -1 until I find a zero of the equation.
u/pavel

Here is a version without much golfing that makes things clearer for(let i=2e3,f=(o,n,x=o*n,y=t/3*n-n,z=4-n)=>z>-1&(x*x+y*y+z*z+3)**2>16*(x*x+y*y)?f(o,n+.01):z;i--;)x.fillRect(i,t*180,f(i/540-16/9,3),3)
u/pavel

(x*x+y*y+z*z+3)**2>16*(x*x+y*y) is directly from https://en.wikipedia.org/wiki/Torus
u/pavel

with R=2 and r=1
u/pavel

This example shoots rays from (0,0,4). In order to rotate the shape you have to move where the rays come from, the camera!
u/tomxor

Thanks for the explanation 👍

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BriSeven

remix of d/18172 by u/BriSeven

function u(t) {

s=30,c=240
for(i=0;i<64;i++)for(j=0;j<36;j++)
x.fillStyle=R(((n=i^j)<(S(t)+1)*s)*c,(n<(C(t)+1)*s)*c,0),
x.fillRect(i*s,j*s,s,s)

Apr 7 2020 5:54 AM UTC

}// 128/140

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plot the XOR binary operator with a "circular" polarizing effect.

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BriSeven

function u(t) {

s=30,c=240
for(i=0;i<64;i++)for(j=0;j<36;j++)
x.fillStyle=R(((n=(i&j))<(m=(S(t)+1)*20))*c,(n<m-20)*c,(n>m+20)*c),
x.fillRect(i*s,j*s,s,s)

Apr 7 2020 5:43 AM UTC

}// 138/140

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plot the AND binary operator with a posterising effect.

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cantelope

function u(t) {

eval(unescape(escape`𭱩𭁨𚁸𚑦𫱲𚁦𪑬𫁒𩑣𭀨𜀬𜀬𥰽𨰮𭱩𩁴𪀽𝐰𜀬𥰩𛁩🐱𝠬𬱴𬡯𪱥𤱴𮑬𩐽𨀣𨐲𩡠𞱩𛐭𞱳𭁲𫱫𩐨𚐩𩡯𬠨𪠽𜐷𞱪𛐭𞱬𪑮𩑔𫰨𜠵𜀫𤰨𬀩𚡓𚁱𚐯𦠪𥰬𚁃𚁱𚐭𤰨𭀩𚐯𦠪𥰭𤰨𭀩𚠱𜰰𚰱𝀰𚐩𦠽𠰨𬀽𚁩🠸🱪𞡩𚐯𜠮𝐵𚱴𛰲𚐪𤰨𬐽𛠳𞐪𚁩🠸🱩𛐸𞡪𚐩𛐴`.replace(/u../g,'')))

Mar 21 2020 4:59 AM UTC

}// 140/140

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u/13thptr

#d3
u/Xen

#sexy
u/katkip

is tag # wireframe suitable for this?
u/cantelope

Sure why not
u/katkip

#wireframe

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tomxor

remix of d/17367 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`𩡯𬠨𪰽𜀻𪐽𪰾🠳𛁪👫𙠷𛁱👩𚱴𚡪𚠪𜠮𝡼𜀬𪰫𚰼𝰶𞀻𮀮𩡩𫁬𤱴𮑬𩐽𤠨𪠽🐳🰱𜠷𞡪𚠲𝐬𪠪🐲𝐬𜠴𜀭𪠩𚑸𛡦𪑬𫁒𩑣𭀨𪐪𜠰𛁪🰵𜀪𚁪𚰱𜠩𚰨𪠭𝀿𜠰𚡃𚁱𛰲𝀩𞠴𜀪𚁱𙐵🠳𚐭𝰰𜀩𞠰𛀲𜀬𜑥𜰫𚁪🐽𝀦𙡃𚁱𛰶𚐼𛠶🰶𜀪𠰨𬐯𝠩𛐸𜀰𞠰𚐩`.replace(/u../g,'')))

Jan 25 2020 11:59 PM UTC

}// 137/140

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#castle moat #bridge

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KilledByAPixel

remix of d/15354 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`𩡯𬠨𪰽𜀻𪰼𝰶𞀻𮀮𩡩𫁬𤡥𨱴𚁩𚠲𜀬𪠿𪠭𝀿𥀪𪠫𥀪𠰨𬐯𞐩𛱪𚰵𞐪𠰨𬐯𝀩𛱪𞡔𚡪𛐴𜀰𚰳𞐪𚁓𚁱𚐪𚠴𚐫𜰹𞐪𚁓𚁱𛰳𜠩🀮𝰩𞠰𛁔🐱𝀳𛁪𛐴🰲𩐳𞠱𩐳𚰷𞐹𚡃𚁱𛰱𝠩𛁸𛡦𪑬𫁓𭁹𫁥👒𚁪𚡔𙐲𜐴𛁪𚠽𜠵𛁔𛑪𚐩𚑩👫🠾𜰬𪠽𪰫𚰥𞀬𬐽𪐫𭀪𪠪𚠳𯀰`.replace(/u../g,'')))

Jan 24 2020 8:34 PM UTC

}// 140/140

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Old #Castle Drive

u/Xen

nice! #Parallax
u/katkip

woww
u/katkip

#genius #compressed
u/sigveseb

fantastic!
u/lionleaf

Insane!

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KilledByAPixel

remix of d/16391 by u/KilledByAPixel

function u(t) {

for(i=340;--i;x.fillRect(960+S(m*m)*q,540+C(m*m)*q,50,50))m=i+120*t,q=1e5/i,x.fillStyle=R(i*i/99,i*i/340)

Oct 31 2019 6:28 AM UTC

}// 105/140

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Supernova ☀

u/katkip

i would like to see this on the sky
u/tomxor

wow!
u/yonatan

and so short!
u/lowtolerance

I don’t understand it at all but I love it

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