GSAP unwanted effects on Threejs Canvas size

AbyssWatcher · November 4, 2023

Hello,

i have a question regarding GSAP and canvas.

I have 2 divs, one is a loading screen and the other one is the page content, which includes 2 canvases.

Im using Barba.js and GSAP to animate the loading screen, so that it slides out and the page content slides in. All of that works as expected, but

when i check on mobile dimensions in the dev tools, suddenly after applying gsap, the canvas doesnt resize properly anymore to the windowsize. I tried wrapping the 2 canvases into a new div but no luck.
I add a picture before and after applying gsap.

 transitions: [
    {
      name: "loading-screen",
      to: {
        namespace: ["home"],
      },
      once() {
        console.log("Transition 'loading-screen' is running.");
        gsap.to("#loading-screen", {
          x: "-100%",
          ease: "bounce",
          delay: 2,
          duration: 2.5,
          onComplete: function () {
            // Hide the loading screen once the animation is complete
            document.getElementById("loading-screen").style.display = "none";
          },
        });
        gsap.from("#main-page", {
          x: "100%",
          ease: "bounce",
          delay: 2,
          duration: 2.5,
        });
        gsap.from(".bg-video", {
          opacity: "0",
          ease: "power1.out",
          delay: 3.5,
          duration: 2,
        });
      },
    },
  ],

  <body class="min-h-screen bg-white text-black" data-barba="wrapper">
    <div class="wrapper" data-barba="container" data-barba-namespace="home">
      <div
        id="loading-screen"
        class="absolute z-40 h-screen w-full bg-black text-right"
      >
        <h2 class="mr-8 mt-[200px] sm:mr-32">
          <span
            class="animate-[counter_2s_linear_forwards] font-grenze text-[200px] text-textcolor2 [counter-set:_num_var(--num)] before:content-[counter(num)] lg:text-[280px]"
          ></span>
          <span class="font-grenze text-[50px] text-textcolor2 lg:text-[120px]"
            >%</span
          >
        </h2>
      </div>
      <div id="main-page" class="h-screen w-full">
        <div class="threejswrapper">
          <canvas
            class="webgl2 fixed left-2 z-10 outline-none sm:left-0"
          ></canvas>
          <canvas class="webgl fixed left-0 top-0 z-20 outline-none"></canvas>
       
        </div>

GSAP Helper · November 4, 2023

It's pretty tough to troubleshoot without a minimal demo - the issue could be caused by CSS, markup, a third party library, your browser, an external script that's totally unrelated to GSAP, etc. Would you please provide a very simple CodePen or Stackblitz that demonstrates the issue?

Please don't include your whole project. Just some colored <div> elements and the GSAP code is best. See if you can recreate the issue with as few dependancies as possible. If not, incrementally add code bit by bit until it breaks. Usually people solve their own issues during this process! If not, then at least we have a reduced test case which greatly increases your chances of getting a relevant answer.

Here's a starter CodePen that loads all the plugins. Just click "fork" at the bottom right and make your minimal demo:

See the Pen aYYOdN by GreenSock (@GreenSock) on CodePen

Using a framework/library like React, Vue, Next, etc.?

CodePen isn't always ideal for these tools, so here are some Stackblitz starter templates that you can fork and import the gsap-trial NPM package for using any of the bonus plugins:

Please share the StackBlitz link directly to the file in question (where you've put the GSAP code) so we don't need to hunt through all the files.

Once we see an isolated demo, we'll do our best to jump in and help with your GSAP-specific questions.

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GSAP unwanted effects on Threejs Canvas size

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