Meshdiff – visually compare two STL versions in the browser, client-side

A nice feature to add could be a synchronized transform: when rotating one viewport the other two rotate along (optional).

	▲	dotjustin 33 minutes ago \| parent [-]
		Quite honestly this is what I expected the default behavior to be. +1

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progbits 7 hours ago | parent | prev | next [-]

Looks handy. Feature suggestion: locked views so all three viewports rotate together.

	▲	twwwt 6 hours ago \| parent [-]
		Had the same wish after one second of rotating one pane. Another thing that came to my mind quickly, whether it would be possible that for one object whose dimension was changed, for instance it was enlarged/shrinked in the x axis by x millimeter, to just highlight those x millimeter of difference. Similar for rotation and shift. Anyway, cool!

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sota_pop 5 hours ago | parent | prev | next [-]

Very cool work! Nice job. Road-map looks good too! I always appreciate client/local-first emphasis. I have been seeing a lot of great in-browser apps coming out via 3js,wasm,etc (THANK YOU LLMs)

With interest in this space you may be interested to check out:

- That Open Company in the BIM industry (not personally affiliated, but admirer). - Fovea ArchVision (also not directly affiliated, but can attest that the team are great people.)

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happyPersonR 4 hours ago | parent | prev | next [-]

Yo this would be cool to have embedded as a PR trigger on GitHub for 3d files

And maybe as a preview option between branches ?

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embedding-shape 7 hours ago | parent | prev | next [-]

This is pretty cool, and seems to be useful in order to compare various "3D model" generators that are around, would make the comparison a bit easier to make.

Given it runs client-side, could you potentially offer like a CLI as well, or something we could integrate with other things / CI? That'd be a really nifty way of generating these diffs for later inspection.

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dvh 6 hours ago | parent | prev | next [-]

- Multi group objs are ignored, I only see first group.

- When uploading same file twice, you should warn about it like meld does (meld says: File /home/foo/Downloads/D_LED_3mm.obj is being compared to itself)

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tomtom1337 8 hours ago | parent | prev | next [-]

Wow! This looks really cool! Looking forward to playing more with this?

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DaSHacka 8 hours ago | parent | prev | next [-]

Wow, just needed something like this literally yesterday, thanks OP.

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croemer 7 hours ago | parent | prev | next [-]

Should be "Show HN"

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ionwake 7 hours ago | parent | prev | next [-]

cool thanks

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projscope 9 hours ago | parent | prev [-]

I built Meshdiff because clients keep sending me part_v3_FINAL.stl and I have no quick way to see what changed.

Drop two STL/3MF/OBJ files → voxel diff renders in your browser. Green = added material, red = removed. Adjustable tolerance (0.05–1mm). Volume delta metrics.

Privacy first: zero upload to any server. Everything runs client-side in a Web Worker.

Stack: React + TypeScript, React Three Fiber, custom voxel diff engine. No Manifold/CGAL — those assume clean CSG topology; real-world STLs are triangle soup.

If you work with 3D prints, try breaking it with your weirdest files. Real-world meshes are chaos and I need the stress test.

	▲	croemer 7 hours ago \| parent [-]
		From https://news.ycombinator.com/item?id=22336638: > Don't have your username be that of your company or project. It creates a feeling of using HN for promotion and of not really participating as a person. You don't have to use your real name, just something to indicate that you're here as a human, not a brand. If you'd like to change your username, email hn@ycombinator.com. Your projscope website cuts off text on mobile as it's completely unresponsive.