New #perspective 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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f8f82804

remix of d/11754 by u/f8f82804

function u(t) {

for(c.width^=0,i=223;i--;x.lineTo(X/d+960,Y/d-960))d=Math.hypot(X=S(ϕ=i&1?2.7:.7)*S(θ=i*1.5-t/2),Y=C(ϕ)/.8+3,C(θ)*S(ϕ)+5)/3e3;x.stroke();

Jan 14 2019 6:40 PM UTC

}// 137/140

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#d3 #hyperbolic #tower #model in a #perspective #projection using #hypot

u/f8f82804

#hyperboloid
u/metamero

#moire
u/f8f82804

This dweet is still based on the spherical model it was remixed from, so all the points we generate are still on the surface of a sphere! The trick is judiciously connecting them with lines.
u/f8f82804

#fullhd

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f8f82804

remix of d/11753 by u/f8f82804

function u(t) {

for(i=c.width^=0;i--;x.fillRect(X/d+960,Y/d,s=45-5e3*d,s))r=i%2+1,d=Math.hypot(X=r*S(ϕ=i/612)*S(θ=i*37-t/r),Y=r*C(ϕ)/.7+4,r*C(θ)*S(ϕ)+5)/1e3

Jan 14 2019 5:22 PM UTC

}// 140/140

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#perspective #sphere #pointcloud #hypot -- the distortion from this projection is clear here, because the two spheres should be concentric but it looks like they aren't

u/metamero

this dweet series is great
u/f8f82804

thanks! I'm having a lot of fun with it. Hopefully I'll be able to fix up the distortion a little and reivist some of these ideas
u/f8f82804

the distortion here is pretty bad because i'm applying the correction incorrectly! see d/11812

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f8f82804

remix of d/11753 by u/f8f82804

function u(t) {

for(i=c.width^=0;i--;x.lineTo(X/d+960,Y/d-960))d=Math.hypot(X=S(ϕ=i/612)*S(θ=i*95**.1-t/2),Y=C(ϕ)/.8+3,C(θ)*S(ϕ)+5)/3e3;x.stroke();

Jan 12 2019 12:17 AM UTC

}// 131/140

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building a #hyperbolic #surface by connecting points on a #sphere with lines, rendered with a #d3 #perspective #projection using #hypot

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f8f82804

remix of d/11749 by u/f8f82804

function u(t) {

for(i=c.width^=0;i--;x.fillRect(X/d+960,Y/d-960,s=48-2e4*d,s))d=Math.hypot(X=S(ϕ=i/612)*S(θ=i*37+i**C(i+t)/i-t),Y=C(ϕ)/.8+3,C(θ)*S(ϕ)+5)/3e3

Jan 12 2019 12:03 AM UTC

}// 140/140

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#perspective #sphere #pointcloud #swarm #traffic #hypot

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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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f8f82804

remix of d/11688 by u/f8f82804

function u(t) {

for(i=c.width^=0;i--;x.fillRect(960+800*S(θ)*S(ϕ)/Z,540+800*C(ϕ)/Z,s=18*(Z>2?.1:2.1-Z),s))ϕ=i/612,θ=i*37+(i/9)**C(i+t)/99-t/2,Z=C(θ)*S(ϕ)+2

Jan 7 2019 10:32 PM UTC

}// 139/140

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#perspective #sphere #pointcloud #swarm #traffic

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f8f82804

remix of d/11620 by u/f8f82804

function u(t) {

for(i=c.width^=0;i--;Z<1.6&&x.fillRect(960+800*S(θ)*S(ϕ)/Z,540+800*C(ϕ)/Z,s=32*(1.6-Z),s)){ϕ=i/600;θ=i*84+(i/9e3)**C(i+t)**2;Z=C(θ)*S(ϕ)+2;}

Jan 7 2019 6:37 PM UTC

}// 140/140

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patterns on a #perspective #sphere with #occlusion

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f8f82804

remix of d/9721 by u/f8f82804

function u(t) {

for(i=c.width^=0;i--;Z<1.6&&x.fillRect(960+800*X/Z,540+800*Y/Z,s=32*(1.6-Z),s)){ϕ=i/600;θ=i-t/5+ϕ*4.5;X=S(θ)*S(ϕ);Y=C(ϕ);Z=C(θ)*S(ϕ)+2;}

Jan 2 2019 7:32 PM UTC

}// 136/140

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#perspective #sphere #stripe

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pavel

remix of d/11421 by u/pavel

function u(t) {

for(x.fillRect(0,0,k=2e3,k);j=--k>>6;x.fillRect((i-j+4)*g,(8+C(i/4)*C((t*30-j|0)/4)*3)*g,s=g*g/200,s))i=k%64,x.fillStyle=R(4*i,g=960/(35-j))

Dec 15 2018 10:08 AM UTC

}// 140/140

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u/cantelope

impressive
u/iverjo

#perspective

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cantelope

function u(t) {

eval(unescape(escape`儽焽㹱┸ⴳ⸷㭷楴栨砩景爨琪㴶ⱷ㴨椽挮睩摴桼㴰⤯㈬晩汬却祬攽怣〰㠲怬瑲慮獬慴攨眽㤶〬瘽㔴〩Ⱳ潴慴攨瑼〩㭩ⴭ㭲潴慴攨⡩⬱⤥㘴㼰㨭ㄩⱦ楬汒散琨儨椩⽚⩷ⱑ⡩⼸簰⤯娪眬猽瘯娬猩⥚㴨椯㘴簰⤭琥ㄫㄻ`.replace(/u(..)/g,"$1%")))

Nov 22 2018 2:05 AM UTC

}// 140/140

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u/Joachim

Wow!! How did I miss this? #d3 #perspective

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