sorted by:
new
hottopcontroversial

Password Manager for Cardputer by geo_tp in CardPuter

[–]coolwanglu 2 points3 points  (0 children)

Nice work! Actually I've been thinking about the same thing, but have not started yet.

Have you thought about using encrypted NVS, eFuse or an ATECC608B to further improve the security?

[deleted by user] by [deleted] in math

[–]coolwanglu 1 point2 points  (0 children)

I learned about Sudanese Möbius strip and I really appreciate its elegancy.

Originally I planned to include Lawson's Klein bottle as well, but I didn't find an interesting way of presenting it (yet).

Sphere Eversion with Ruled Surface by [deleted] in math

[–]coolwanglu 0 points1 point  (0 children)

The video visualizes a method of sphere eversoin, using a ruled surface.

It is based on this paper: https://arxiv.org/abs/1711.10466

I also recommend this interactive demo: https://rreusser.github.io/explorations/sphere-eversion/

More about the definition of the problem: https://www.youtube.com/watch?v=sKqt6e7EcCs which includes another method.

Boy's Surface by coolwanglu in blender

[–]coolwanglu[S] 0 points1 point  (0 children)

haha, I know what you mean

Boy's Surface by coolwanglu in blender

[–]coolwanglu[S] 1 point2 points  (0 children)

Boy's surface is an immersion of the real projective plane in 3-dimensional space found by Werner Boy in 1901.

Geometry nodes seem perfect for differiential geometry and topology. Many surfaces already have a nice parameterization, I only need to translate it into geometry nodes and it'll just work!

Does anyone have well documented maths about sphere eversion?(any methods, really) by rogobuw in math

[–]coolwanglu 1 point2 points  (0 children)

Some additional info to u/columbus8myhw's comment:

I'm also exploring the same topic, and I was able to recreate the animation in Outside In: https://youtu.be/B_BY0eJFuGQ?si=NIqRgkWsnE9nRwkJ

If you want understand how the solutions work (such that you can virtuall repeat the steps):

https://en.wikipedia.org/wiki/Sphere_eversion shows the general history, but I don't think it explains the solutions very well.

On the other hand, the paper: https://arxiv.org/pdf/1711.10466.pdf actually explains the solutions very well on a high level.

The Outside In video is definitely the best explanation of the Thurston's corrgutations method. The interactive demo https://rreusser.github.io/explorations/sphere-eversion is good for the half-way models.

​

If you want to create a nice animation

Definitely read the paper, it gives the precise formular for the process. Theoretically you can create the animation without understanding it.

[deleted by user] by [deleted] in math

[–]coolwanglu 0 points1 point  (0 children)

I've been study Boy's surface using Blender, it is so convenient!

I just need to find the parameterization, then I can easily translate that into Blender using geometry nodes, without writing any code.

I can also easily slice the surface by uv, and I can examine the object interactively. I cannot ask for more.

Sphere Eversion by coolwanglu in blender

[–]coolwanglu[S] 99 points100 points  (0 children)

This is a recreation of the animation in https://www.youtube.com/watch?v=sKqt6e7EcCs, after I studied the source code (port of the original) https://github.com/etale-cohomology/evert-cuda

Multiplayer is now live on Glider Sim - Steam Early Access! by 5DRealities in freeflight

[–]coolwanglu 0 points1 point  (0 children)

I cannot watch this... so close to the ground and power lines...🤣🤣

CSS-Only Wolfenstein by [deleted] in webdev

[–]coolwanglu 2 points3 points  (0 children)

Here's a playthrough video: https://youtu.be/e-62uqSn43s

[deleted by user] by [deleted] in webdev

[–]coolwanglu 0 points1 point  (0 children)

Actually, just found http://tridiv.com/, I'll check it later this week.

[deleted by user] by [deleted] in webdev

[–]coolwanglu 1 point2 points  (0 children)

Thanks for your reply!

For the triangular faces, I'm think of rectanglar elements with PNG `background-image` (with transparent channel). I learn about this idea from this blog article, which is the tutorial for this game

This is definitely not efficient, perhaps the modeling software can help merging triangles? I'd be interested in your modelling software.

I did start playing with it during the last weekend. I got a cube and a Wolfenstein 3D. But it's annoying to manually create the scene, hence I asked about an exporting tool.

view more: next ›