What is troubling you? This is just ScrollTrigger with pin applied on the parent. The animation is basically a perspective scaling. First build the animation then add ScrollTrigger. You will have to calculate when the animation ends, could be as simple as some z: XXX but better way may be to calculate when the last photo is out of the viewport.     See the Pen b7599ae9273237439923abb264dfddce by dadacoded (@dadacoded) on CodePen  
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