u/Abobe_Limits

i came across this website and i really liked that transition between hero section and the next session, please anyone know what is it called or how can i recreate it, is it GSAP or webgl or what?
Thanks in advance

https://preview.redd.it/duuhl8c5ccxg1.png?width=1346&format=png&auto=webp&s=567d2c088b7e5008ecf1aa2e8e6e3e7ecb9590de