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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

function u(t) {

c.width=300+S(t/2)*99
with(x)for(i=17;--i;fill())globalAlpha=.2,arc(X=99+i*S(t/3)*3,70,450/(Z=i-t*6%1),2.7,6.7)&rect(X-(z=150/Z),70+z,z*2,7)

Mar 31 2018 10:18 AM UTC

}// 140/140

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Tribute to Strange Crystals

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u/iverjo

Very good tunnel!
u/p01

✨ You can save 3 bytes by replacing 2.7 and 6.7 by 9 and 13
u/jylikangas

Thanks! Improved version: c.width=W=350+C(t)*150 with(x)for(i=17;--i;fill())globalAlpha=.2,arc(X=W/2+i*S(t/3)*4,70,450/(Z=i-t*8%1),9,13)&rect(X-(z=150/Z),70+z,z*2,7)
u/iverjo

#tunnel
u/sigveseb

#witchcraft
u/pavel

Even better with(x)for(c.width=W=350+C(t)*150,i=17;--i;fill(rect(X-z,70+z,z*2,7)))globalAlpha=.2,z=150/(i-t*8%1),arc(X=W/2+i*S(t/3)*4,70,3*z,9,13)
u/vain

This psydo 3D programming is just too high for me! My biggest respect! ! ++++

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joeytwiddle

remix of d/7301 by u/yonatan

function u(t) {

for(x.beginPath(i=1920);i--;x.lineTo(i,t%9*99+(Y|0)*8*t))for(Y=0,j=4;j--;)Y=Y+S(((i-960)/t+S(t+Y)*299*j*j/t)/(40*2**j));
t<9&&x.stroke()

Mar 12 2018 11:13 AM UTC

}// 136/140

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jagarikin inspired wireframe landscape

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u/joeytwiddle

Nice work by yonatan. I am happy to abuse all the spare characters they saved!
u/joeytwiddle

To finish it off: s/t%9/t/ ; s/t<9/t<15/
u/aleamb

wow! love it!!
u/iverjo

Neat!
u/iverjo

#landscape
u/fujimotos

#scanline
u/fujimotos

#slow_render

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jonathan_b

remix of d/6285 by u/jonathan_b

function u(t) {

with(x)for(s=i=c.width|=0;i-=5;beginPath(fill()))r=T(i*9+S(t+i*2))*420,arc(s/2+r*2,500+r*T(i),q=i/7,0,7),fillStyle=`hsl(${r/3},70%,${q/3}%)`

Feb 5 2018 12:21 AM UTC

}// 140/140

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u/magna

Sweet!
u/DeathBoy

Daaaaaamn, that's beautiful
u/jonathan_b

sometimes you find the best stuff when you
u/jonathan_b

are looking for something else entirely
u/codeslaw

magnificent

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pavel

function u(t) {

c.width|=f=k=>(1-3/(4+9e9**(i-.5-t%4)))*w*(-2/(i+k&3)|1)-w/2
for(i=5;i--;x.rect(960+f(2),540+f(1),w,w))w=2**(i?7+t/4%1:12)
x.fill`evenodd`

Jul 18 2019 4:05 AM UTC

}// 138/140

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St[a]ck (https://www.reddit.com/r/perfectloops/commen…)

u/KilledByAPixel

👍
u/Xen

love it
u/metamero

omg so satisfying
u/iverjo

#perfectloop
u/katkip

Awesome!

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tomxor

remix of d/20405 by u/tomxor

function u(t) {

eval(unescape(escape`𭀿𨰮𭱩𩁴𪀽𭰽𝠴𞡘👙👚👒🐵𞱦𫱲𚁡👓𚁒𚐬𨠽𠰨𤠩𛁰🐳𩐳𞱰𛐭𞱘𛐽𪰪𨐬𦠭👫𚡢𛁙𚰽𪰪𠠬𤠭👫𚡁𛁸𛡦𪑬𫁒𩑣𭀨𬀥𭰬𬀯𭰬𜐬𜠭𝀯𩀩𚑦𫱲𚁁👰𙑷𛰳𜠭𜐬𠠽𬀯𜑥𜰬𩀽𜐻𚁘𚱤𚡁𚡢𛑤𚡡𧡙𚱤𚡂𧡚𛑤𚡁𚡡𛑤𚡢𚐥𜐵🠱𞱤𚰽𛠱𚑫🐱𩐭𝀭𜱥𛐴𛱤𛱤`.replace(/u../g,'')))

May 28 2021 12:53 AM UTC

}// 140/140

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Descending a #minecraft cave

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u/tomxor

Significantly faster in Firefox! #raymarching
u/tomxor

Seriously, it's like 30x faster, this is going to be my test case for fixing Dwitter perf
u/KilledByAPixel

Wow! 🤯 Runs great in capjs ;) Though I did need to disable loop protect to get the full render.
u/DataMeta

this is insane
u/Xen

love it!
u/yonatan

you've outdone yourself!
u/13thptr

Speechless.
u/rep_movsd

I cant even!
u/rodrigo.siqueira

As @aemkei said: "This piece is insane!" https://twitter.com/aemkei/status/1398235717…
u/DaSpider

Wait. What?
u/tomxor

Woooo perf fixes are merged! :D Big shout out to u/LionLeaf and u/KilledByAPixel for working through this with me. Keep an eye out for issues and let us know on discord if you spot any regressions.
u/jellyedwards

That's incredible!
u/donbright

:o

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rodrigo.siqueira

remix of d/11965 by u/pavel

function u(t) {

for(x.fillRect(0,0,i=3e3,i);Q=S(--i*i);x.clearRect(960+150*(S(b)*4+S(i+t)*Q),540+150*(C(i*i)-(t%4>2?T(b+t):S(b+t))),4,4))b=i%6+t+(t%2>1?0:i)

Jan 28 2019 2:40 PM UTC

}// 140/140

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Torus, spheres, flow and bubbles

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u/rnbw

now THIS is a demo!
u/katkip

Yeah he win
u/13thptr

woah
u/joeytwiddle

Superb! Golf the end with i*(t%2>1) or i*!(t&1)
u/rodrigo.siqueira

Thanks @joeytwiddle for the golf trick. i*(t&1) also works and it's even shorter. And I found that t%4>2?... can be converted to t&2?... It works as a counter to change the function each 2 seconds.
u/yonatan

Also, since T and S take the same arguments (t%4>2?T(b+t):S(b+t)) can be (t&2?T:S)(b+t)
u/lionleaf

Wow! Now we're talking
u/vain

Wow, three fx in this tiny code? Great!

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nystrand

function u(t) {

for(c.width|=j=0;j<40;j++)for(i=0;i<45;i++)r=j*30+C(t+j&t)*S(i+t)*(j%2&i|t),x.lineTo(C(w=t+i/7)*r+1e3,S(w)*r+r);x.fill('evenodd')

Dec 26 2017 11:24 AM UTC

}// 129/140

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u/sigveseb

very nice!
u/Xen

love it, i had to remix! #3695

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nystrand

function u(t) {

p=(a,b,d,w=1)=>d>3?x.fillRect(a-w,b-w,d*w,d*w)&p(a,b,d-5)&p(a+b*C(t+d),b+a*S(d)/8,d-4):x.fillStyle=R(d*88,d*a/9,50+d*99,.3);p(a=650,a,60,a)

Mar 29 2017 8:25 PM UTC

}// 139/140

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u/cantelope

incredible!
u/magna

So pretty!
u/nonce

wow
u/sfz

holy shnikes!
u/donbright

great colors
u/iverjo

#galaxy
u/vain

incredible code and fx. the source is to cryptic for me. XD

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yonatan

remix of d/9666 by u/joeytwiddle

function u(t) {

for(x[f='fillRect'](0,0,c.width=99,j=299);q=j--/9;x[f](50+C(i)*s*6,26+C(i*8)*s,s,s))x.shadowColor=R(j,i=j*j/1e4+t,99),s=99/q,x.shadowBlur=q

Sep 5 2018 6:59 PM UTC

}// 139/140

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Smokey 3D structure with joey's shadows

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u/sigveseb

Way amazing!
u/cantelope

epic!
u/donbright

O M G
u/donbright

this is .. is this even real or am i dreaming?
u/joeytwiddle

Wow! The 3D looks real, but the scene is dreamlike. #d3
u/aleamb

amazing
u/iverjo

So good!
u/joeytwiddle

#glow

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kchplr

function u(t) {

for(c.width^=0,i=1296;i--;X=i%48,Y=i/48|0,d=1-((X-24)*(X-24)+(Y-13)*(Y-13))/300,s=(200*S(t*C(d))*d*d)%45,x.fillRect(X*40-s/2,Y*40-s/2,s,s));

Feb 26 2017 3:48 PM UTC

}// 140/140

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u/sigveseb

I like this!
u/Kalanchoe

Somewhat reminds me of Halite: halite.io
u/iverjo

Nice technique!
u/KHymatim

Mmmmm