Dweets awesomed by u/DataMeta

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.

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Current theme challenge: #Food

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rodrigo.siqueira

remix of d/18458 by u/rodrigo.siqueira

function u(t) {

for(X=f=c=>S(S(9*c/d)*t),Y=t/8-1.1,i=2e3;i--;x.fillRect(i,t*60,(1+f(X=i/480-2)*f(Y))*(d/2+Y),3))x.fillStyle=R(C(r=X*X+Y*Y)*125),d=r>1||T(r)

Apr 23 2020 5:58 PM UTC

}// 139/140

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Red Sphere Reflection #raytracing (high resoluton)

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u/Xen

Tf Dude! top dweet right here 😍
u/lionleaf

That's amazing!
u/lionleaf

#glass #sphere
u/stiaje

#witchcraft
u/Ath0r

Impressive, great job!
u/katkip

genius script
u/PoweredByWill

wow. dwitter povray.
u/mole

I am shooketh. This is absolutely incredible.
u/katkip

#slowrender
u/cli

This is great.
u/Nascretis

Actually insane. #witchcraft
u/ximavus

So realistic

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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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tomxor

remix of d/18413 by u/pavel

function u(t) {

for(w=c.width=120,i=9e3;i--;x.fillRect(i%w,i/w,1+S(9*X/d)**5*S(9*Y/d)**5,d/2+Y/3))X=i%w/30-2,Y=i/w/30-1,r=X*X+Y*Y,d=r>1||1+(1-r)*S(r*9-t*4)

Apr 23 2020 1:15 AM UTC

}// 139/140

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u/aleamb

impressive! #render #witchcraft #raytracing #scene

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BrutPitt

function u(t) {

c.width+=X=Y=Z=d=.19
for(i=9e3;i--;)X+=d*(-d*X+S(Y)),Y+=d*(-d*Y+S(Z)),Z+=d*(-d*Z+S(X)),
x.lineTo(960+99*(X*C(t)-Y*S(t)),560-99*Z)
x.stroke()

Apr 22 2020 10:50 PM UTC

}// 140/140

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3D Thomas #Attractor

u/BrutPitt

Very shrinked code from glChAoS.P #Tomas formula: https://www.michelemorrone.eu/glchaosp/dtAtt…
u/tomxor

woah
u/BrutPitt

Thanks to KilledByAPixel's rotation technique in his Lorenz dweet
u/KilledByAPixel

👍

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DaSpider

remix of d/16705 by u/DaSpider

function u(t) {

t?s+=(u=S(9*t+4))*(u>-.9):s=9;if(s>250)return;x.ellipse((c.width=999)/2,260,s,s,0,1,9);x.stroke();x.fill();throw`\n`.repeat(S(9*t)*3+4)

Apr 22 2020 7:55 PM UTC

}// 135/140

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Inflating #circlechallenge

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tomxor

remix of d/18323 by u/pavel

function u(t) {

f=(x,y,n=w)=>x<n?f(x*x-y*y-.8,2*x*y+.2,n-1):S(n/9)
for(w=c.width=99,i=6e3;i--;)
x.fillRect(X=i%w,Y=i/w,1,f((X-49)/t**8,(Y-28)/t**8-.703956))

Apr 22 2020 7:38 PM UTC

}// 140/140

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#zoom #julia #fractal

u/tomxor

Including x<n and .2i from u/rodrigo.siqueira
u/xem

amazing! how many extra bytes to have it less pixellized?
u/tomxor

Only +2 for 1/4 HD: d/18436 but your CPU will cry :P in fact full HD fits but you have to start measuring the speed in seconds per frame.
u/iverjo

Impressive!

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DataMeta

function u(t) {

t||(r=0),r=(5*r+1)%256,x.beginPath(x.stroke()),x.arc(960,540,r,0,7)

Apr 22 2020 7:20 PM UTC

}// 67/140

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#circlechallenge using a Linear Congruential Pseudo-RNG

u/DataMeta

64 bytes: t?r=(5*r+1)%256:r=0,x.beginPath(x.stroke()),x.arc(960,540,r,0,7)

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pavel

function u(t) {

for(f=c=>Math.tanh((r>1?3:13)*S(9*c/d)),Y=t/3-1,i=2e3;i--;x.fillRect(i,t*180,(1+f(X)*f(Y))*(d/2+Y/3.6),3))X=i/540-16/9,r=X*X+Y*Y,d=r>1||C(r)

Apr 22 2020 6:18 AM UTC

}// 140/140

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Experimenting with #raytracing. I finally figured out why the cosine trick from d/1112 works.

u/Cloud

WOW!

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KilledByAPixel

function u(t) {

with(x)c.width|=0,
fill(arc(960,520+S(t)*49,300,0,7)),
beginPath(filter=`blur(${4-S(t)}em`),
fill(ellipse(960,900,290,60,0,0,7))

Apr 22 2020 4:34 AM UTC

}// 128/140

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⬤ #circlechallenge

u/SockTaters

it's so ominous

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DaSpider

function u(t) {

A=Array(s=2e3).fill().map(Math.random)
for(i=s;i--;(a-.5)**2+(b-.27)**2>.05?0:x.fillRect(a*s,b*s,5,5))a=A[i],b=A[s-i]

Apr 21 2020 11:42 PM UTC

}// 117/140

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#circlechallenge Monte Carlo Method

u/DaSpider

Using only good old Pythagoras. This method can be used to estimate π ≈ 4*(number of points in the circle / total number of points) // t?1:d=g=0;A=Array(s=6e3).fill().map(Math.random);for(i=s;i--;(a**2+b**2)**.5<=1?d++:1)a=A[i],b=A[s-i];g+=s;throw(4*d/g)
u/joeytwiddle

Very cool!

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