Hey HN, I built Spin Lab: a browser-based interactive explainer for table-tennis spin.
It visualizes topspin/backspin, spin rate, ball trajectory, bounce behavior, and why the opponent’s return reacts the way it does.
I built it because spin is central to table tennis, but most explanations are either too hand-wavy or too static. I wanted something you can scrub, slow down, and experiment with.
You might consider emailing hn@ycombinator.com and asking about the standing of your account.
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This is what we call a "time of check/time of use" issue.
Their post/comment was dead when I first saw the comments
Accusations of being an LLM are par
It's the new NPC insult.
Are you using flight trajectories with simulated drag and lift from Magnus effect?
Yes! it does do the math for Magnus effect. Source code is all client side you can take a look at it.
But early on when I started this, I prompted the LLMs strongly to focus on having accurate real world physics baked in.
Nice! Why I can only select the angle in multiples of 5°? I expected to be able to rotate the blade just a little.
For "Back Spin" I used: angle = open 50°, Brush = -20° down, Speed = 13 km/h and I got a success "Lands - Smash Food". Do you have a table of the possible classification?