How can I replicate this cool Effect?

There is this website:

At the very end of their page, There is a 3D model of letter “D” that has some amazing mouse interactions. I was always fascinated on how can it be replicated. I recently studied about GPGPU and I am still not very sure on how I am make that effect. I want to make it for a letter “J” (maybe just make a library for it). I would really like to know if anyone is interested to explain and help me replicate this effect.

Well, this is higher level of particles. For good start, try switch this mesh on points/particles, add nice shaders/postprocesing and ready to go. This is good start point as well…

Points material, fake sphere shader, particles simple moving with turbulence.

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