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| ▲ | YuechenLi 5 hours ago | parent | next [-] |
| The only way to go from STL to BREP is through decompilation style recovery/reconstruction, because of the semantic information loss, so it's a task that can only be done via LLMs or human CAD users. Essentially, they pretty much have to remake the model from scratch using the STL as a reference to make the CAD. There really isn't a good way to automate this without machine learning/LLMs. |
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| ▲ | fsloth 5 hours ago | parent | prev | next [-] |
| " if you want something that can be manufactured that's not good enough" People design all sort of buildable things in SketchUp and it's just about dragging polygons around. You _may_ need accurate surface if you run your model to CAM. But to this day lot of manufacturing is still done via drawings and there the only thing that matters is that can you draw some type of lines and attach clear dimensions to them. So the shapes don't necessarily need to be accurate for all flows since they are more like topological hints to the person reading the drawing rather than accurate replica of the thing to manufacture. |
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| ▲ | buildsjets 6 hours ago | parent | prev | next [-] |
| CATIA has had mesh import with canonical feature detection, and automatic replacement with parametric part features, for at least 25 years. It's in the "Quick Surface Reconstruction" and "Basic Surface Recognition" tools. They even work sometimes. https://3dswym.3dexperience.3ds.com/wiki/catia-user-communit... https://resources.rand3d.com/insights-from-within/scanned-da... Unfortunately the P3 license costs like $15k per year, and it is f'in ugly clunky software. |
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| ▲ | ttul 7 hours ago | parent | prev | next [-] |
| It's just a matter of time. Astra was trained on a new 3D modelling dataset. They will surely train it on CAD apps (if they have not already done so). I don't hold out much hope for competitors hoping to get in front of that train. |
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| ▲ | glaslong 5 hours ago | parent | prev | next [-] |
| I suppose you might be able to force a Blender agent to do parametric modeling via geometry nodes. It would be a horrible, kludgy, slow workflow for a human, but the AI won't complain. |
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| ▲ | prodmod 5 hours ago | parent | prev | next [-] |
| I was able to have Astra accurately solid model with plasticity (NOT import from Blender) and presumably it would be trivial with autocad, but I haven’t tried it yet. |
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| ▲ | yakz 7 hours ago | parent | prev | next [-] |
| Astra can use build123d, too. You'll get a STEP out of that. |
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| ▲ | jrflo 6 hours ago | parent [-] | | I've tried Sol on build123d and it was completely unusable, I should take another stab with Astra though. | | |
| ▲ | ricketycricket 6 hours ago | parent [-] | | I had a similar experience, but it worked just well enough that I wanted to try my own similar experiment, but using a functional API in Elixir and giving the agent some introspection tools. I'm very much a novice to this space and learning as I go, but I've been able to make some interesting projects with the library so far, which is all I really want to do: https://smith.hexdocs.pm If you want to build by hand, there is a Kino renderer to build your projects interactively in Livebook, which is actually surprisingly helpful for learning. |
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| ▲ | ur-whale 7 hours ago | parent | prev [-] |
| > there isn't a good way to go from STL -> Parametric CAD yet. as a matter of fact, you should try what AI can do on that problem, you'd be surprised. |
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| ▲ | jrflo 7 hours ago | parent [-] | | I have tried, I really wish it would be better because CAD is a slog and I want it to be automated. It's pretty bad at real world tasks. |
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