Top #sphere 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) {

for(c.width=i=960;--i;x.ellipse(480,270-56*(j%2-.5)*y,r=32*(64-y*y)**.5,r/2,0,a=(j+t%1)/7,a+!j*7))j=i>>4,y=i%16-8;x.stroke()

Apr 10 2019 8:35 AM UTC

}// 124/140

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#wireframe #sphere

u/f8f82804

#d3
u/Xen

Nice!
u/lionleaf

Nice one! #globe
u/pavel

I use 44 longitude lines so the arc angle between adjacent two is 2*pi/44 which is approximated by 1/7 to 4 decimal places.
u/pavel

Using the famous pi ~ 22/7 approximation.

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yonatan

remix of d/7101 by u/yonatan

function u(t) {

for(A=c.width=99;A--;)for(B=57;B--;x.fillRect(A,B,s,s))X=A-50,Y=B-27,q=X*X+Y*Y,z=(2200+C(t)*2e3-q)**-.3,s=S((t*9+X*z^C(t)*9+Y*z)/9)

Feb 27 2018 8:26 PM UTC

}// 131/140

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pavel

function u(t) {

for(c.width=i=1944,w=960;i--;x.fillRect(w+w*S(a)*S(b)/z,540+w*C(b)/z,s=13/z/z,s))j=i%72,z=2+C(a=2.7+S(t)+(j&4?0:j)/72)*S(b=1.5+(i/72|0)/120)

Apr 11 2019 6:03 AM UTC

}// 140/140

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#default on a sphere

u/f8f82804

#d3 #sphere #perspective
u/katkip

how lol
u/pavel

I draw #default one pixel at a time and treat (x,y) of the pixels as angles (a,b) in spherical coordinates. Spherical to 3d cartesian is x=r*sin(a)*sin(b), y=r*cos(a)*sin(b), z=r*cos(b). Projecting 3d to 2d cartesian is x'=x/(2+y/r), y'=z/(2+y/r), and scaling pixel size by 1/(2+y/r)**2 so stuff in the back is smaller.

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ETHproductions

function u(t) {

c.width|=Z=256;for(Y=1;~Y;Y-=4/Z)for(X=1;~X;X-=4/Z)Math.atan2(((a=Math.acos)(X/(1-Y*Y)**.5)+t)%6.28,a(Y))*9&1&&x.fillRect(Z-X*Z,Z-Y*Z,4,4)

Jan 8 2018 9:23 PM UTC

}// 138/140

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A completely different approach at a rotating patterned sphere: raytracing!

u/sigveseb

nice
u/Xen

mission completed ;-)
u/magna

hax!
u/13thptr

#raytrace
u/13thptr

#sphere #d3

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p01

function u(t) {

for(x.fillStyle=R(i=c.width|=0);i--;)X=i/11%4-2,Y=i/240-4,(X-t^Y)&1||x.fillRect(99*(S(X*.8)*C(Y*=.4)+t*2%18),960-99*(4*S(t%3.1)-S(Y)),9,9)

Mar 4 2017 9:36 PM UTC

}// 138/140

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BOING! A 138bytes tribute to the legendary Amiga demo

u/alien

mother of god...
u/joeytwiddle

#sphere #ball #amiga

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rodrigo.siqueira

remix of d/27499 by u/rodrigo.siqueira

function u(t) {

for(x.fillRect(0,0,w=2e3,w),i=1e4;i--;x.clearRect(960+S(p=T(i**5))/(Z=1/i/(t%3)+1/(t<3?i:480)),540+C(p)/Z,K=3*S(i)+1,K))x.globalAlpha=.1

May 10 2023 1:19 PM UTC

}// 136/140

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Star pulse #sphere

u/deobfuscate

I cannot explain with words how cool this is.
u/donbright

if i undersand it, the "twinkling" really adds alot. they aren't all the same size of white particle?
u/rodrigo.siqueira

The "twinkling" is given by the particle size (2 last parameters of x.clearRect). Pixel size is defined by 3*S(i)+1, so it's between "3+1" and "-3+1" and the "i" makes it almost random for each pixel. An extra twinkling effect could be made by adding "t", but I thought it would be too exaggerated. You can try by changing to: K=5*S(i+t*4)

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username

remix of d/9690 by u/donbright

function u(t) {

for(c.width|=i=0;i<5e3;i++)Φ=Math.acos(1-2*i/99/99),Θ=10.1664*i,x.fillRect(500*(2+C(Θ)*S(Φ)*S(t)+C(Φ)*C(t)),500*(1+S(Θ)*S(Φ)),9,9)

Nov 26 2019 3:53 PM UTC

}// 130/140

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half a sphere

u/username

#randomremix no 38
u/f8f82804

#d3 #sphere #model
u/fourier.space

If I blink, it rotates both ways
u/username

u/fourier.space actual f, I see it too
u/username

u/fourier.space I missed to mention you on d/16759

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f8f82804

remix of d/11689 by u/f8f82804

function u(t) {

for(i=c.width^=0;i--;x.fillRect(X/d+960,Y/d/.9-1150,s=47-d*2e4,s))a=S(ϕ=i/612),θ=i*37+C(i/99+t),d=Math.hypot(X=S(θ)*a,Y=C(ϕ)+3,C(θ)*a+5)/3e3

Jan 11 2019 8:11 PM UTC

}// 140/140

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#waves on a #perspectives #sphere -- #d3 #pointcloud

u/f8f82804

this dweet uses a better perspective transform based on Math.hypot -- #hypot
u/f8f82804

The projection still isn't perfect, because I'm rotating the sphere's axis towards the viewer by positioning it below the camera. The resulting distortion is approximately corrected by scaling the Y coordinate with /.9.
u/f8f82804

#perspective

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yonatan

function u(t) {

for(X=c.width=99;X--;)for(Y=57;Y--;x.fillRect(X,Y,s,s))q=X*X+Y*Y,z=(9604-q)**.5,s=z<99?S(((t*10+X*z**-.5)^(Y*z**-.5))/40):C(t/4)

Feb 27 2018 4:17 PM UTC

}// 128/140

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u/aleamb

amazing!
u/yonatan

shorter and uglier (98 chars): for(X=c.width=99;X--;)for(Y=57;Y--;x.fillRect(X,Y,s=S((t*9+X*z^Y*z)/9),s))q=X*X+Y*Y,z=(9e3-q)**-.3
u/donbright

holy smokes, holy cow
u/iverjo

#sphere

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danny@hille.dk

remix of d/23472 by u/danny@hille.dk

function u(t) {

eval(unescape(escape`񩡯𬤨񨰮󭱩󩍴𪌽񭰽𜨵񝘬𩀽𫥥𭸠򢙭򨑧󩝄󨑴𨐨񭸬󭴩񛁭🕷󚭷򛍩😭񜘻򫔭񛔻𩀮񩉡򭅡󦱩𚴽񝉝🐭𦐪򚍯🔳𛔨󝌭򝔪󩐩򚨪𛠵𚔯𚍥󚴱񚔪򭰭򭄪𞐹󙥷񧭘𚥯򛸨𩔫𜘩񚩷򚽴򚨹󙥷𚝥🐨𚉘🐭򜜫󜤪𚉭󛹷󯀰򚜯𭰩򚡘򚼨񦔽򛘱𚴲󚨨󫜥󭴩񛹷󚘪𦘩𚬪󜬊𮌮󬁵𭍉󫕡񩱥𡉡򭉡񚉤󛄰򛄰񚜻`.replace(/u../g,'')))

Aug 6 2021 2:10 AM UTC

}// 138/140

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#disco remix

u/danny@hille.dk

#sphere

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