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ScrollTrigger snap issue

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I'm having a an issue when scrollTrigger snaps. This is my code.

presST = gsap.timeline({
  scrollTrigger: {
    trigger: presElem,
    start: 'top top',
    end: '300% 90%',
    // markers: true,
    pin: true,
    pinSpacing: true,
    scrub: 1,
    toggleActions: "restart pause resume pause",
    snap: {
      snapTo: 1/7*6,
      duration: {min: 0.5, max: 1.25},
      ease: 'power1.out'
  defaults: {
    ease: 'power1.out',

When the progress is less than 0.5, it snaps to progress 0, to the start. How avoid that? how to make aaaalways snaps to the specified point?

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If you want to customize how it behaves, you should use a function.


  • Function - snap: (value) => Math.round(value / 0.2) * 0.2 feeds the natural destination value (based on velocity) into the function and uses whatever is returned as the final progress value (in this case increments of 0.2), so you can run whatever logic you want. These values should always be between 0 and 1 indicating the progress of the animation, so 0.5 would be in the middle.


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