New #pointcloud 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/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/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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