Very distracting to try and read text in the middle of a constantly spinning visualisation
Show HN: I was curious about spherical helix, ended up making this visualization
71–80 of 140 posts
Re: Show HN: I was curious about spherical helix, ended up making this visualization
#72https://www.johndcook.com/blog/2023/08/12/fibonacci-lattice/
If you want a spiral that covers the sphere with evenly spaced samples, consider this approach.
Re: Show HN: I was curious about spherical helix, ended up making this visualization
#73When I first opened it, its basically a bunch of static pages that made absolutely no sense. My first question was 'why is this garbage being #1 on HN?' Then I realized that, unlike the early web with banners of "best viewed in Netscape navigator", this was an unstated "best viewed in google chrome". Alas. At least please check and validate if the site works in Firefox, or notify appropriately. Because this demonstra…
For me, it doesn't work entirely in Librewolf 142 (shows the text, and some tags moving around an otherwise black screen), but does work in Firefox Nightly.
Re: Show HN: I was curious about spherical helix, ended up making this visualization
#74Okay, I have some followup questions. Are the points equally spaced? I.e. the cube's |∆p| is constant? I see you scale z by the sin. What happens of you don't?
Without scaling the rate of change of the given curve would not be constant.
Re: Show HN: I was curious about spherical helix, ended up making this visualization
#75This reminds me of how the spins in MRI are manipulated in order to acquire the signal. Tracking the tips of the spins traces out similar looking paths. https://m.youtube.com/watch?v=vapJRr6gAds&t=2786s
Re: Show HN: I was curious about spherical helix, ended up making this visualization
#76I can't tell why, but I'm getting terrible performance on Linux/Brave. The CPU spikes immediately on visit. I'm on a powerful machine (32 GiB RAM, Intel i9 w/ 24 cores).
> I can't tell why Let's find out where this sentence goes! > Linux Would look into that. > Brave. Definitely would look into that. > 32 GiB RAM, Intel i9 w/ 24 cores This part is not relevant
How is that not relevant?
Re: Show HN: I was curious about spherical helix, ended up making this visualization
#77Earlier quoted context omitted.
> I can't tell why Let's find out where this sentence goes! > Linux Would look into that. > Brave. Definitely would look into that. > 32 GiB RAM, Intel i9 w/ 24 cores This part is not relevant
How is that not relevant?
Because any non-broken combination of browser and software platform can run this on any PC made this century. It runs fine on my terrible Atom Chromebook, even.
Re: Show HN: I was curious about spherical helix, ended up making this visualization
#78I never tought this would be interesting but it is VERY much.
Re: Show HN: I was curious about spherical helix, ended up making this visualization
#79Awesome visualizations. The part that I was expecting to see but didn't: how can you move at a constant speed? For the original purpose of positioning objects along a path, it doesn't matter. But when moving, you can see it's moving much more slowly at the beginning and end (mostly determined by the radius). What if I want it to travel at a constant rate? Or even apply an easing function to the speed? I'm sure there'…
>I'm sure there's some fancy mathematical trick that would just do it. If I were only more comfortable with math... my handwavy sketch would be to compute the speed function by differentiating the formulas to get dx, dy, and dz and passing them through the Pythagorean equation, then reparameterize on a t' variable using the inverse of the speed function? Maybe? I feel like I'm speaking using words I don't understand.
What you're looking for is called arc length parameterization. Basically, you need to compose the curve with the inverse of its arc length function. Aside from a few special curve families, closed-form solutions don't exist.
Re: Show HN: I was curious about spherical helix, ended up making this visualization
#80I was wondering about the “correctness” of the z-axis movement for the spherical helix. You could pick lots of different functions, including simple linear motion (z = c * t). This would obviously affect the thickness and consistency of the “peels”. The equation used creates a visually appealing result but I’m wondering what a good goal would be in terms of consistency in the distance between the spirals, or evenness…
Just a thought: Make the velocity of the path constant. There should be some way to take a derivative an set it to a constant and solve for z. ( or really reparameterize the curve t' = f(t)) so the velocity is constant.
Actually, now that I think about it, choosing z = c * t is kind of both influencing how the path is parameterized as well as the path carved out on the sphere.