New #raytracing 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.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Opposites

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pavel

function u(t) {

for(let i=2e3,z=(i,j=6)=>j&&Math.max(z(i,j-1),(1/j-(i/540-1.8+C(j))**2-(t/3-1+C(j*j)/2)**2)**.5-S(j)/3||0);i--;)x.fillRect(i,t*180,1-z(i),3)

May 19 2020 5:17 AM UTC

}// 140/140

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#raytracing a baby alien?

u/katkip

kinda #cute
u/yonatan

looks like a teddybear to me
u/andrea270872

Wow! It has a really organic look to it
u/veubeke

If I look at it for longer than 5 seconds, it looks like it’s moving. 😱
u/KilledByAPixel

Congrats, I can see the family resemblance! 😂

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rodrigo.siqueira

remix of d/18445 by u/pavel

function u(t) {

for(X=f=c=>C(T(4*c/d)),Y=t/8-1.1,i=2e3;i--;x.fillRect(i,t*60,(1+f(X=i/480-2)*f(Y))/2,3))x.fillStyle=R(S(Y)*99,0,C(r=X*X+Y*Y)*99),d=r<0||S(r)

Apr 25 2020 6:31 PM UTC

}// 140/140

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Towards Infinity (Escher-like tilings) mirror #sphere #raytracing

u/KilledByAPixel

👍
u/joeytwiddle

#shiny

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rodrigo.siqueira

remix of d/18461 by u/rodrigo.siqueira

function u(t) {

for(X=f=c=>C(T(4*c/d)),Y=t/8-1,i=2e3;i--;x.fillRect(i,t*60,1+f(X=i/480-2)*f(Y)/d,3))x.fillStyle=R(K=C(r=X*X+Y*Y)*200,0,S(K)*80),d=r>1||C(r)

Apr 24 2020 12:57 AM UTC

}// 139/140

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Hello Dave (HAL 9000) #raytracing #glass #sphere

u/Xen

love it
u/13thptr

incredible

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rodrigo.siqueira

remix of d/18458 by u/rodrigo.siqueira

function u(t) {

for(X=f=c=>S(S(9*c/d)*t),Y=t/8-1.1,i=2e3;i--;x.fillRect(i,t*60,(1+f(X=i/480-2)*f(Y))*(d/2+Y),3))x.fillStyle=R(C(r=X*X+Y*Y)*125),d=r>1||T(r)

Apr 23 2020 5:58 PM UTC

}// 139/140

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Red Sphere Reflection #raytracing (high resoluton)

Show more comments…
u/Xen

Tf Dude! top dweet right here 😍
u/lionleaf

That's amazing!
u/lionleaf

#glass #sphere
u/stiaje

#witchcraft
u/Ath0r

Impressive, great job!
u/katkip

genius script
u/PoweredByWill

wow. dwitter povray.
u/mole

I am shooketh. This is absolutely incredible.
u/katkip

#slowrender
u/cli

This is great.
u/Nascretis

Actually insane. #witchcraft

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rodrigo.siqueira

remix of d/18413 by u/pavel

function u(t) {

for(f=c=>S(S(9*c/d)*t),Y=t/3-1,i=2e3;i--;x.fillRect(i,t*180,(1+f(X)*f(Y))*(d/2+Y),3))X=i/480-2,r=X*X+Y*Y,x.fillStyle=R(C(r)*120),d=r>1||T(r)

Apr 23 2020 3:35 PM UTC

}// 140/140

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Red Sphere Reflection #raytracing

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pavel

function u(t) {

for(let i=2e3,f=(x,n,c=8-(t+6)*n)=>~n&(x*x*n*n+(8+(t-12)*n)**2+c*c-5)**2/16+c*c>1?f(x,n+=.002):c;i--;)x.fillRect(i,t*180,f(i/135-7,.7),3)

Apr 23 2020 7:27 AM UTC

}// 137/140

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Actually #raytracing a #torus using ray marching

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u/Xen

Sweeet!
u/tomxor

Yes! we need more explicit surfaces on dwitter :)
u/Odog8

which expression is the DFT?
u/tomxor

I'm confused... this isn't explicit? it recurses.
u/pavel

This recurses just to advance ray length.
u/pavel

The closed form expression is x*x*n*n+(8+(t-12)*n)**2+c*c-5)**2/16+c*c-1 where c=8-(t+6)*n and n is the free variable.
u/tomxor

Ah, so is this technically ray casting? I have to ask because I still don't intuitively get all of the math.
u/tomxor

Sorry I meant ray marching
u/pavel

Yes. The math constructs a ray from (0,8,8) looking at (0,0,0), varied a bit depending on the pixel being drawn, its length is a function of n. I plug this into the equation for a torus and increment n from .7 to -1 until I find a zero of the equation.
u/pavel

Here is a version without much golfing that makes things clearer for(let i=2e3,f=(o,n,x=o*n,y=t/3*n-n,z=4-n)=>z>-1&(x*x+y*y+z*z+3)**2>16*(x*x+y*y)?f(o,n+.01):z;i--;)x.fillRect(i,t*180,f(i/540-16/9,3),3)
u/pavel

(x*x+y*y+z*z+3)**2>16*(x*x+y*y) is directly from https://en.wikipedia.org/wiki/Torus
u/pavel

with R=2 and r=1
u/pavel

This example shoots rays from (0,0,4). In order to rotate the shape you have to move where the rays come from, the camera!
u/tomxor

Thanks for the explanation 👍

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tomxor

remix of d/18413 by u/pavel

function u(t) {

for(w=c.width=120,i=9e3;i--;x.fillRect(i%w,i/w,1+S(9*X/d)**5*S(9*Y/d)**5,d/2+Y/3))X=i%w/30-2,Y=i/w/30-1,r=X*X+Y*Y,d=r>1||1+(1-r)*S(r*9-t*4)

Apr 23 2020 1:15 AM UTC

}// 139/140

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u/aleamb

impressive! #render #witchcraft #raytracing #scene

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pavel

function u(t) {

for(f=c=>Math.tanh((r>1?3:13)*S(9*c/d)),Y=t/3-1,i=2e3;i--;x.fillRect(i,t*180,(1+f(X)*f(Y))*(d/2+Y/3.6),3))X=i/540-16/9,r=X*X+Y*Y,d=r>1||C(r)

Apr 22 2020 6:18 AM UTC

}// 140/140

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Experimenting with #raytracing. I finally figured out why the cosine trick from d/1112 works.

u/Cloud

WOW!

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yonatan

remix of d/10334 by u/yonatan

function u(t) {

c.width|=c.style.background='radial-gradient(tan,#000'
for(k=4e3;k--;x.fillRect(960+(k%9/4+S(t)-1)*20*$,640+k/9,2.5*$,k>9?.5:-200))$=20+k/81

Oct 12 2018 5:32 PM UTC

}// 140/140

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#default

Show more comments…
u/donbright

WWWWWWWWWWOAH
u/prplz

this is the one
u/iverjo

#shadows
u/sigveseb

YES! SO GOOD!
u/sigveseb

and it's a #default too! :P
u/loni_art

yooooooooooooooooooo!
u/katkip

lol nice
u/aleamb

great!
u/veubeke

<3
u/katkip

64 awesomes! 29/11/2019
u/dull_pixel

#raytracing
u/vain

amazing! Like the added gradient and shadow fx. ++++

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yonatan

function u(t) {

for(i=j=c.width=198;i--;)for(X=i-99,Y=20;Y++<120;)h=S(X/Y*5)*S(Y/9-t*9),x.fillStyle=R(128-h*99),x.fillRect(i,(Y+h*29)*Y/j,Y/j,199)

Mar 9 2018 3:14 AM UTC

}// 130/140

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half-assed floor marcher

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u/joeytwiddle

looks very nice
u/aleamb

great!
u/magna

Looks like marching half-asses
u/yonatan

Good point! I'll pretend I was going for that
u/iverjo

Very nice!
u/joeytwiddle

#renderer #raytracing #raymarching

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