Perspective Tunnel

Concentric rings fly toward you as you scroll.

∞

How to use it

Paste the HTML where the scroll effects should appear. Include the script tags at the top once per page.
Add the CSS to your stylesheet. All classes are prefixed, so nothing clashes with your own styles.
Add the JavaScript and call init() with the element that contains the HTML.

<!-- Perspective Tunnel · NedDev · eigen werk. -->
<!-- benodigd, één keer per pagina: -->
<script src="https://cdn.jsdelivr.net/npm/gsap@3.13.0/dist/gsap.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.13.0/dist/ScrollTrigger.min.js"></script>

<div class="jouw-container">
<div class="pt-tunnel"></div><div class="pt-core">&#8734;</div>
</div>

/* Perspective Tunnel · NedDev · eigen werk. */
.pt-stage{position:relative;width:100%;height:100%;background:radial-gradient(circle at 50% 50%,#161616,#0a0a0a 70%);overflow:hidden;perspective:600px}
.pt-tunnel{position:absolute;inset:0;transform-style:preserve-3d;display:grid;place-items:center}
.pt-ring{position:absolute;width:60%;aspect-ratio:1;border:2px solid rgba(245,72,15,.5);border-radius:50%;will-change:transform,opacity}.pt-ring:nth-child(even){border-color:rgba(255,255,255,.22)}
.pt-core{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font:300 clamp(40px,10vw,90px)/1 'Switzer',sans-serif;color:#F5480F;pointer-events:none}

// Perspective Tunnel · NedDev · eigen werk.
// root = het element waarin de HTML staat
function init(root){
root.classList.add('pt-stage');var reduce=matchMedia('(prefers-reduced-motion:reduce)').matches;var tun=root.querySelector('.pt-tunnel');var COUNT=8,rings=[];
for(var i=0;i<COUNT;i++){var r=document.createElement('div');r.className='pt-ring';tun.appendChild(r);rings.push(r);}
function place(p){rings.forEach(function(r,i){var z=((i/COUNT)+p)%1;var tz=-700+z*900;var op=z<.12?z/.12:(z>.85?(1-z)/.15:1);r.style.transform='translateZ('+tz+'px) scale('+(.4+z*1.1)+')';r.style.opacity=op.toFixed(2);});}
place(0);
if(window.gsap&&window.ScrollTrigger&&!reduce){gsap.registerPlugin(ScrollTrigger);var o={p:0};gsap.to(o,{p:1,ease:'none',scrollTrigger:{trigger:root,start:'top bottom',end:'bottom top',scrub:true,onUpdate:function(){place(o.p);}}});}else if(!reduce){var p=0;(function loop(){p=(p+.0025)%1;place(p);requestAnimationFrame(loop);})();}
}
init(document.querySelector('.jouw-container'));

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