Top #illusion 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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Current theme challenge: #Opposites

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KilledByAPixel

remix of d/18160 by u/rodrigo.siqueira

function u(t) {

for(c.width&=j=3e3;j--;x.lineTo(448+S(a=i*.209+t*9)*r,600+C(a)*r/2-i))i=(j/4+(j%4!=2)*60|0)-t%1*40,r=i**3/2e5
x.stroke()

Apr 6 2020 10:04 PM UTC

}// 120/140

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#Vortex

u/ivylab

I have been waiting for the view to zoom out more for a minute. But it's seriously continuous! Amazing
u/KilledByAPixel

Thank you, it was tricky to get this one right.
u/KilledByAPixel

#illusion

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KilledByAPixel

function u(t) {

for(t*=b=540,i=3e3;j=i--/470;x.fillRect(960+t*S(j),b+t*C(j),9,9))a=(i/64+(t>>6)|0)%2,x.fillStyle=t%64<9?a^t>b?R():'#fff':R(b*!a,t/5,b*a)

Oct 2 2020 6:44 PM UTC

}// 136/140

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False Motion Optical Illusion 👁️👁️

u/KilledByAPixel

#illusion

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pythech

remix of d/8630 by u/pythech

function u(t) {

c.width|=0
with(x)for(i=3;i--;stroke())beginPath(lineWidth=r=100*C(t+3.14)+200),arc(650+250*i,700-i%2*434,r/2,z=i*2.095,5.235+z)

Jun 17 2018 9:24 PM UTC

}// 128/140

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Imaginary Triangle

u/lionleaf

#illusion
u/iverjo

#opticalillusion
u/Purpzie

You can save 1 character by putting arc(650+250*i,700-i%2*434,r/2,z=i*2.095,5.235+z) in the for loop before stroke()
u/Purpzie

oh wait no you can't it's the same, never mind

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metamero

function u(t) {

eval(unescape(escape`琿挮睩摴桼㵪㴱㔺猽〻潮浯畳敭潶攽攽㹳㵥⹸⽩湮敲坩摴栻稽㜲㭲㴨愬戬挬搬攩㴾筸⹦楬汓瑹汥㵒⡥㼱㈸㨰⤻砮晩汬剥捴⡡⩺⨴Ɫ⩺Ᵽ⩺Ɽ⥽㭦潲⠻樻⥦潲⡲⡳ⱪⴭⰲ㈬㐬椽㘩㬭⵩㬩爨椫⡳⴮㔩⨨樥㈩ⱪⰲⱺ⤻`.replace(/u(..)/g,"$1%")))

Dec 9 2018 9:00 PM UTC

}// 140/140

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#Interactive #CafeWallIllusion

u/metamero

t?c.width|=j=15:s=0;onmousemove=e=>s=e.x/innerWidth;z=72;r=(a,b,c,d,e)=>{x.fillStyle=R(e?128:0);x.fillRect(a*z*4,b*z,c*z,d)};for(;j;)for(r(s,j--,22,4,i=6);--i;)r(i+(s-.5)*(j%2),j,2,z)
u/metamero

#cafewall #illusion #opticalillusion #mouse
u/katkip

nice
u/DataMeta

#hiddengem

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metamero

remix of d/11172 by u/metamero

function u(t) {

eval(unescape(escape`挮睩摴栽ㄹ㈰㭣⹳瑹汥⹢慣歧牯畮搽✣㤹㤧㭦潲⡰㴮㔻瀼㤹㬫⭰⥦潲⡱㴰⸵㭱㰹㤻⬫焩睩瑨⡸⥢敧楮偡瑨⠩ⱡ牣⡲㵰⨹㤬猽焪㤹ⰱ㌬〬㜩ⱦ楬汓瑹汥㴧⍦晦✬晩汬⠩ⱦ楬汓瑹汥㵒⠩ⱦ楬汒散琨爭㤱ⱳⴹㄬ㠳ⰸ㌩`.replace(/u(..)/g,"$1%")))

Nov 27 2018 12:01 PM UTC

}// 140/140

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Find the Black Dots - Scintillating Grid Illusion

u/metamero

c.width=1920;c.style.background='#999';for(p=.5;p<99;++p)for(q=0.5;q<99;++q)with(x)beginPath(),arc(r=p*99,s=q*99,13,0,7),fillStyle='#fff',fill(),fillStyle=R(),fillRect(r-91,s-91,83,83)
u/metamero

#OpticalIllusion #Scintillating #Grid #Illusion
u/katkip

#illusion
u/metamero

#ScintillatingGridIllusion

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KilledByAPixel

remix of d/32728 by u/KilledByAPixel

function u(t) {

z=t*20|0
for(c.width=i=240;i--;)for(j=135;j--;)x.fillRect(i,j,1,S(((i%32-16)**2+(j%32-16)**2<99-S(t)*99+49?(j>>5)*32+i%32-z:j-z)**9)**2)

Nov 10 2024 7:29 PM UTC

}// 136/140

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Animated Coffer Illusion 🔮

u/cantelope

#coffer #cofferillusion
u/joeytwiddle

Great illusion and great dweet! #illusion #opticalillusion

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ntsutae

remix of d/20669 by u/tomxor

function u(t) {

for(c.width&=i=8320;i--;)
x.fillRect(X=i&127,Y=i>>7,
k=S(8*t+X*X-3*Y*Y+19*X*Y)+.5,k)

Nov 18 2020 4:30 PM UTC

}// 84/140

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u/tomxor

#illusion This is messing with my eyes! looks like continuous rotating slices without ever getting beyond 90 degrees
u/joeytwiddle

Travelling without moving
u/ntsutae

I didn't have enough understanding and respect for the work

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rodrigo.siqueira

remix of d/13119 by u/rodrigo.siqueira

function u(t) {

c.width+=X=Y=Z=d=.04
for(i=6e3;i--;)X+=-d*(Y+Z),
Y+=d*(X+.2*Y),
Z+=d*(.2+Z*(X-5)),
x.lineTo(980+80*(X*C(t)-Y*S(t)),800-Z*48+Y*19)
x.stroke()

Jan 12 2020 12:43 AM UTC

}// 140/140

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Turning Rössler Strange Attractor, a system of three non-linear ordinary differential equations with chaotic dynamics and fractal properties. Some people see this turning clockwise, some see counterclockwise due to the bistable optical illusion (search "Spinning Dancer" for explanation). #attractor #illusion

u/rodrigo.siqueira

The rotation effect trick X*C(t)-Y*S(t) was "borrowed" by Frank Force KilledByAPixel's #Lorenz Attractor: from https://www.dwitter.net/d/14752

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f8f82804

remix of d/9671 by u/f8f82804

function u(t) {

with(x)for(i=c.width^=0,arc(960,530,475,0,7),clip();beginPath(),i--;fill())C(t-i)>0&&arc(960+(i*960-i*i)**.5*S(t-i),48+i,9,0,7)

Sep 5 2018 7:03 PM UTC

}// 127/140

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proof-of-concept for #clip #mask to help clean up the edges of a #sphere

u/joeytwiddle

This is doing something weird to my eyes! #illusion

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soggypretzels

function u(t) {

c.width|=0;for(i=999;i--;){x.globalCompositeOperation='xor';q=(i%2*2-1);x.fillRect(i*30-(q*t*9)-6000+q*i/9,q*300+(S(t+i/5)*99*q)-99,30,999)}

Jul 13 2018 12:48 PM UTC

}// 140/140

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u/magna

WOWZA!
u/joeytwiddle

#illusion

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