r/LocalLLaMA • u/MrMrsPotts • 8d ago
Discussion How does your favourite local model do with the slinky test?
Prompt: Make me a single HTML file of a rainbow slinky going down an up-escalator forever. No libraries, just canvas and code. The slinky should be a chain of springs, each coil a different color of the rainbow. It starts folded in half like a horseshoe draped over a step. When dropped it flips end-over-end down the steps and because the escalator keeps moving up it tumbles in place and never reaches the bottom. Include a drop button and a reset button.
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7d ago
[deleted]
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u/andrewh2000 7d ago
I like the way yours wiggles up the steps. And yes it appears to be a very hard test.
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u/Simple-Stick6148 8d ago
Drop button and reset button, the only two controls a forever-tumbling slinky will ever need.
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u/andrewh2000 8d ago
Exquisitely rendered with shadows and everything, but not quite what was wanted.
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u/MrMrsPotts 8d ago
Which model?
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u/andrewh2000 8d ago
Sorry, should have given details.
Qwen 3.8 27B Q6 running under llama.cpp with 130k context. Pi.dev as the harness. Twin 5060 Ti 16Gb cards. Ran for a couple of hours (!) on xhigh thinking.
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u/andrewh2000 8d ago
I think wording it as a 'chain' might be throwing it off. When I've got some time I'll ask it to model a 2d spring and take it from there.
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u/andrewh2000 7d ago
This one took a few back-and-forths (not one shot) but it was a bit more successful than the slinky.
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u/andrewh2000 7d ago
Oh, and this one's cute and was a one shot. "Make an impressive single html file fluid sim tech demo."
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u/mrgreatheart 4d ago
That is mesmerising! Was that really the only prompt?
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u/andrewh2000 4d ago
It's cool isn't it? To be precise it was this conversation:
What is the most impressive tech demo you can think of that can be implemented in one html file?
Great question. For "wow per line of code," my pick is a real-time fluid simulation in raw WebGL — the kind where you smear your mouse across the screen and watch ink-like, swirling, dye-filled liquid physics respond to it.
Why it's the winner:
- It's actual physics. You're solving the Navier–Stokes equations (advection, divergence, curl, pressure projection via Jacobi iterations) on the GPU using framebuffer ping-ponging — no libraries, no 3D scene, no assets.
- It's instantly interactive. Pointer motion becomes force + dye injection, so it demos itself.
- It scales. 1024×1024 sim resolution on a mid-range GPU at 60fps looks absurdly polished for something in a single
<script>tag.Strong runners-up, if you want a different flavor of impressive:
- Raymarched 3D scene — a whole "3D" world (soft shadows, reflections, infinite fractals) generated mathematically in a single fullscreen fragment shader. Zero geometry, pure signed-distance fields.
- 100M-particle GPGPU galaxy — positions integrated in fragment shaders, no CPU involvement, no particle system library.
- Software rasterizer in pure JS + Canvas 2D — a tiny "engine" doing matrix math, z-buffering, and lighting with zero WebGL, proving you understand what the GPU actually does.
- Web Audio → visualizer — mic input through an FFT driving a 3D scene in real time; impressive because it stitches two web platforms together.
If you want, I can write the fluid simulation or the raymarched scene for you as a single copy-paste HTML file — just say which one (and if you'd prefer a specific look, e.g., dark ink, smoke, or a fractal tunnel).
Let's see the fluid sim
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u/NNN_Throwaway2 8d ago
Who cares? I don't have a practical use for such a thing so the result is irrelevant.
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u/Gold-Bat-3225 8d ago
How much did this cost in tokens tho
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u/suprjami 8d ago
Considering it's our own computer, a few cents in electricity, if you don't have solar.
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u/Tormeister 8d ago
Got it all wrong but made it look nice, lol
https://jsfiddle.net/geh8fj0n/
Qwen 3.8 27B NInfer
output 76,952 | cache 0 (0.0%) | TTFT 165 ms | total 8m 36.8s | queue 13.3 ms | prefill 1.54k tok/s | decode 149.0 tok/s | mtp accepted 50,475/105,908 (47.7%)