This particular one is made in Blender and you can probably just ask the authors on Reddit.

- "This video is a collaboration David Lowry-Duda, that actually started here on the /r/math Reddit thread."

https://old.reddit.com/r/math/comments/m0w1qs/a_modular_form...

...Which (probably) refers to this thread:

- "I'd like to talk to you about producing a similar visualization for modular forms. These are inherently "just complex functions", but they're nontrivial to compute. But in two recent papers, I study how to compute modular forms and various visualizations of modular forms."

- "I'm knowledgeable about various 2d plotting, but I don't actually know anything about 3d plotting. I'm aware that blender exists and that shaders exist, but that's the extent of my knowledge. This is a major aspect of complex function visualization that I'm missing."

https://old.reddit.com/r/math/comments/k53813/visualizing_fu...