Top #physics dweets

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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pavel

function u(t) {

t?c.width|=0:(i=A=240,j=B=80,p=q=-9)
x[f='fillRect'](i+=p=i<7*A?p:-p,840,A,A)
x[f](j+=q=j>0?q:-q,1e3,B,B)
j>i-B&&(j=i-B,p+=s=(q-p)/5,q-=s*9)

Jan 24 2019 10:56 PM UTC

}// 140/140

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Perfect elastic collision #physics #simulation

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u/pavel

Big block is 9x the weight of the little block
u/katkip

This is impressive. Idea from 3blue1brown?
u/iverjo

Wow!
u/bekfast2390

This is like ping-pong!
u/joeytwiddle

Some context: https://www.youtube.com/watch?v=HEfHFsfGXjs 3Blue1Brown
u/katkip

hi, PI
u/Undefined

A fellow 3b1b fan, I see :D
u/joeytwiddle

#3b1b
u/ivylab

I always wait until the big one gets way up to the left side and it goes bam bam bam bam bam :)

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tomxor

remix of d/25758 by u/tomxor

function u(t) {

eval(unescape(escape`𩡯𬠨𭀿𭰽𨰮𭱩𩁴𪀦👩🐸𜰲𜀺𠐽𠠽𥐽𥠽𪰽𜰲𞱩𛐭𞱔🐲𚡃𚀶𚡍𨑴𪀮𨑴𨑮𜠨𦀭🐶𝀬𦐭👫𚐭𭰪𠰨𭀯𜠩𚐫𦀪𦀯𭰫𦐪𦐯𭰾𝐩𮀮𩡩𫁬𤡥𨱴𚁘👩𙑷𛁙👩𛱷𛀱𛁔𯁒🀰𚐬𨐽𦀭𠐬𨠽𦐭𠠬𤠽𨐪𨐫𨠪𨠭𪰬𥀦𤠼𜀦𙠨𥐭👡𛁖𛐽𨠩𞱁𚰽𥐯𪰬𠠫👖𛱫𛁖𚰽𝰭𥠯𝐻`.replace(/u../g,'')))

Jun 28 2022 9:27 PM UTC

}// 140/140

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Spherical #Laundry #Physics

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u/tomxor

#centrifugal #centripetal #washingmachine
u/Joachim

Awesome
u/vain

Very cool! Amazing work
u/aleamb

wow! amazing!
u/TGY

that would've been amazing website loader XD
u/Odog8

I see stuff like this and wonder why more physics engines don't use raycasting for collision...
u/magna

HOWWWW

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KilledByAPixel

function u(t) {

eval(unescape(escape`󥌼󜭥󜼿󨼮󭽩󩍴󪍼󟜰󞭘󟝓󚍴󛍕󟝖󟝔󟜰󚜪󜼰󜌫󜝥󜼊󮌮󩭯󫭴󟜧󝝩󫬢󙼊󩭯󬬨󪼽󞜴󞽫󛜭󞼨󫌽󚍁󛜽󦌩󚭁󚼨󠬭󟝔󚜪󠬩󟌳󩜳󙬦󚍕󛜽󚍱󟜲󛬲󚬨󥜪󠜫󥬪󠬩󛽬󚜪󠜬󥬭󟝱󚭂󚜩󮌮󩭩󫍬󥍥󮍴󚌧󛬧󛌮󛬮󪼿󦽁󟝫󚬲󜜱󙜲󩜳󛍂󟝫󚬱󜭝󞭛󦌫󟝕󚬽󛬹󝜬󥌫󟝖󟜱󚽖󚬮󞜵󧜩`.replace(/u../g,'')))

Jul 26 2021 3:33 AM UTC

}// 140/140

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Plink! ⚫ #physics

u/Xen

love it!
u/DataMeta

ahh this is great!!
u/vain

what?? unbelievable! great work
u/KilledByAPixel

#bounce

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pavel

remix of d/12516 by u/pavel

function u(t) {

for(;t<9;)u[c[t]=t]=50*t++
for(c.width|=a=9;b=a--;u[b]-p<50&&(c[a]=c[b],c[b]=v))x.fillRect(960+(p=u[a]+=v=c[a]*=u[a]**2<8e5||-1),440,50,200)

Feb 26 2019 12:36 AM UTC

}// 140/140

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#default #physics #uncompressed

u/13thptr

cool
u/lionleaf

Amazing!
u/Ath0r

Very nice!
u/katkip

!!

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nystrand

function u(t) {

p=t?(c.width|=n=960,p.push([7,n*S(t)]),p.map(([a,b,d=0,e=b])=>[f=a+a-d,g=b+b-e,f>n?f+6:a,f>0&g<0?g+g:b+.3,x.fillRect(500+a,n-b,22,22)])):[]

Mar 28 2017 4:58 PM UTC

}// 139/140

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u/donbright

excellent
u/katkip

#physics

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tomxor

remix of d/23413 by u/tomxor

function u(t) {

eval(unescape(escape`𩡯𬠨𭀿𭰽𨰮𭱩𩁴𪀦👩🐸𜰲𜀺𠐽𠠽𥐽𥠽𞀻𪐭𛐻𥀽𤰨𦀯𝠩𚱃𚁙𛰽𝠩𚱙🠸𚑸𛡦𪑬𫁒𩑣𭀨𦀽𪐥𭰬𦐽𪐯𭰬𜐬𥁼𤠼𜀩𛁡👘𛑁𛁢👙𛑂𛁒👡𚡡𚱢𚡢𛐲𝐬𥀦𤠼𜐦𙠨𥐫👒𚡡𛁖𚰽𤠪𨠩𞱁𚰽𥐯𭰫𭰬𠐥👷𛁂𚰽𥠯𭰬𥠫🐱𞀭𥠯𜱥𜰻`.replace(/u../g,'')))

Jun 28 2022 8:24 PM UTC

}// 129/140

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Smoler Impossible Marble #Physics

u/tomxor

-11 bytes: Eliminated the intermediate k, moved some coefficients around, and swapped hypot for square values which is actually more stable for intersection resolution. Now it will never stop jiggling :D
u/magna

WOW!
u/pavel

Currently traced pixel is part of the ball and part of the background therefore collision. Awesome trick. My first time seeing this.

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tomxor

remix of d/23413 by u/tomxor

function u(t) {

eval(unescape(escape`𩡯𬠨𭀿𭰽𨰮𭱩𩁴𪀦👩🐸𜰲𜀺𠐽𠠽𥐽𥠽𜀻𪐭𛐻𪰽𤰦𤠼𝐿𛠱𜠵𛑒𛰴𜀺𜀬𥐭👫𚡡𛁖𛐽𪰪𨠩𮀮𩡩𫁬𤡥𨱴𚁘👩𙑷𛁙👩𛱷𛀱𛁓𯁒🀵𚐬𤰽𥀨𥀨𠰨𦀯𜐰𚐪𠰨𦐯𞐫𭀩𚐩🁙𛰹𛐳𚰳𚡃𚁴𚐬𤠽𣑡𭁨𛡨𮑰𫱴𚁡👘𛑁𛁢👙𛑂𚐻𠐫👕𚱷𛁂𚰽𥠪🐮𞐬𠐥👷𛁖𚰽𛠱`.replace(/u../g,'')))

Jul 28 2021 12:57 AM UTC

}// 140/140

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"This Thing" Capturing a Marble #Physics

u/magna

!!!
u/katkip

OMG

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joeytwiddle

remix of d/11968 by u/joeytwiddle

function u(t) {

c.width|=0;o=t*7%15.7-22/7;j=o>0;w=(99-j*80-j*o*1.6)*S(!j*o+j*o*4);x.ellipse(920,850-j*600*S(o/4)-w,200-w,200+w,0,0,7);x.fill()

Jan 27 2019 5:54 AM UTC

}// 127/140

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New_Core's bouncing ball + squash = jumping jack

u/katkip

Nice
u/katkip

#physics #jelly
u/DataMeta

Delightful!
u/joeytwiddle

Change o*4 to o*3 for a slower wobble

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tomxor

function u(t) {

eval(unescape(escape`𩡯𬠨𭀿𭰽𨰮𭱩𩁴𪀦👩🐸𜰲𜀺𚁁👂🐸𛁕👖🐰𚐻𪐭𛐻𪰽𥀦𤠼𝐿𛠲𝐭𤠯𜠰𞠰𛁕𛐽𪰪𨐬𥠭👫𚡢𚑸𛡦𪑬𫁒𩑣𭀨𦀽𪐥𭰬𦐽𪐯𭰬𜐬𥁼𤠼𝐩𛁔👓𚁘𛰶𚐫𠰨𦐯𝠩𚱙𛰶🠸𛁒👍𨑴𪀮𪁹𬁯𭀨𨐽𦀭𠐬𨠽𦐭𠠩𞱁𚰽𥐬𠠫👖𛁁𚰽𭰬𠐥👷𛁖𚰽𛠱𜠵`.replace(/u../g,'')))

Jul 28 2021 12:08 AM UTC

}// 134/140

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Impossible Marble #Physics

u/tomxor

Inspired by d/23398. Uses raster/2d-voxel based intersection
u/Xen

love it!
u/magna

HOW?!
u/katkip

how
u/tomxor

It's particle physics, but the collisions are with implicit volumes. So rather than checking against a specific object, each pixel is intersected with the circle, if the pixel is filled and intersects, then it contributes velocity to the particle along the collision normal (the vector between the pixel and the point), the deeper the intersection based on the radius the greater the contribution... this is not correct at all and creates lots of phantom momentum, but is very simple and shares the code with drawining the screen.

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tomxor

remix of d/17761 by u/ElisionFR

function u(t) {

c.width=innerWidth
n=t?n.map(([A,B,X,Y])=>[A,B+.6,X+A/4,Y+B/4,x.fillRect(X,Y,3,3)]):[]
onmousemove=({x,y})=>n[t*60&255]=[x-C,y-S,C=x,S=y]

Feb 27 2020 12:12 AM UTC

}// 137/140

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#interactive #particles #physics

u/tomxor

lol nmap
u/katkip

Awesome!
u/aleamb

amazing!
u/DataMeta

haha dude niice

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