GenCAD (gencad.github.io)

153 points by dagenix 6 hours ago

geuis 2 hours ago

To the author if they happen to see this. Please kill the auto playing video. If someone is listening to something else on their phone this always takes over and interrupts.

cjtrowbridge 3 hours ago

This has been easy with OpenSCAD for a long time. I have made lots of cool, complex models this way. I built a repo of the prompts I use to show the llm how to do this and it includes many of the models I've created this way...

https://github.com/cjtrowbridge/vibe-modeling

oasisaimlessly 2 hours ago

OpenSCAD has almost zero crossover with B-rep modelling ('true' CAD, what this apparently is), though.

twelvechairs 13 minutes ago

OpenSCAD uses CSG which is generally better. Easy to convert CSG to BREP. Cant generally do the opposite

iamgopal an hour ago

how hard it is ? with AI prevalent, how long ? any pointers to start from ?

bschwindHN 38 minutes ago

alexgoodhart 2 hours ago

What is the inference overhead on this

jvanderbot 3 hours ago

Same. Working with an LLM and OpenSCAD has been totally painless.

richk449 3 hours ago

I’ve been using cadquery and build123 with Claude code and I find it incredibly painful.

What is your workflow for llm integration to openscad?

achllle 2 hours ago

I wanted to see how well it performed on real pictures of parts or hand-drawn drawings, but when I tried setting up the docker image, immediately ran into all kinds of dependencies not being installed. The examples make me suspect it doesn't work well beyond images that were generated from CAD in the first place.

atoav an hour ago

If only there was some kind of container that allowed you to bundle all your dependencies together with your software.

clippy99 29 minutes ago

Maybe I missed something, if you have the image rendering in the first place, you already (likely) have the CAD. It is a nice demo, but what is the utility?

andrew_kwak 17 minutes ago

Checked out GenCAD. It seems pretty useful for simple circuit designs. Wondering if it supports import/export with other CAD formats?

ecto 2 hours ago

Readers may also enjoy my open source Rust BRep CAD kernel https://github.com/ecto/vcad or the hosted version at https://vcad.io.

I also wrote a bit about what goes into CAD apps! https://campedersen.com/tessellation

ecto 2 hours ago

(forgot to mention, it's wired up to Claude so you can vibe CAD, like OP but with a few more steps - I'd like to train a similar model soon! I also wrote about my first stab at this https://campedersen.com/cad0)

isaisabella 31 minutes ago

The demo seems pretty cool, but also pretty simple. When it comes to complicate models, I afriad it would be hard to generate the accurate 3D model.

mamami 4 hours ago

Ideally it would tie in with an llm, no? Like you would want to be able to say something like "create a design of car suspension subject to x,y,z contrains"

cush 3 hours ago

The input is images, and the output is CAD models, so it appears you could use a multi-modal LLM to natural language -> image -> CAD

ugh123 3 hours ago

The examples they show are so basic.

knollimar 5 hours ago

It says "can convert cad latents into a sequence of parametric CAD commands"

Which CAD program? I'm confused

Am I reading this right?

>Most importantly, GenCAD does not merely generate a 3D solid but also the entire CAD program.

dbcurtis 4 hours ago

> Which CAD program? I'm confused

Clue here: > Our proposed GenCAD architecture...

So, at this point, it seems like this will work with all CAD programs, since they have yet to encounter any systems that they can't work with. More seriously, my guess would be whatever one is available for free in their lab. Kind of standard operating procedure for academic projects -- do a proof of concept, make a video that avoids known bugs, get a grade, push source to git, graduate. Good ideas come out of that... production code... eh... maybe.

More likely someone ends up in the situation that my kid did, previous graduate student's git repo is stale by 2 versions of C++, and 4 versions of ROS, and neither of the two unit tests still work after porting.

hug 4 hours ago

It's DeepCAD* output, it looks like, which is a JSON payload that is the sketch / extrude / whatever steps, which is itself based on Onshape output.

Looks like you can go JSON -> step files, but not really in such a way that you can modify any of the operations.

* https://github.com/mightyhorst/DeepCAD

lagrange77 5 hours ago

> Which CAD program?

Doesn't matter. CAD models/objects are represented by a sequence of operations on a primitive or sketch. Unlike meshes, that describe the manifested resulting shape of objects in 3D programs like Blender.

So it's about the fact, that their model outputs that hierarchy of operations. The history of development, not just the result.

SchemaLoad 4 hours ago

How does it not matter? Every CAD program is not going to have exactly the same interface and commands. I doubt for example this will for example generate and OpenSCAD text file.

plumeria 4 hours ago

itishappy 3 hours ago

Nothing stops you from storing a history of mesh operations. This is exactly what modifiers (including geometry nodes) do in Blender today.

simpleintheory 4 hours ago

Is this Google-affiliated? The heading font is Product/Google Sans which IIRC only Alphabet is allowed to use and the entire webpage seems to be Google-style but neither of the two named researchers seem to be employed by Google?

vpzom 3 hours ago

Per https://fonts.google.com/specimen/Google+Sans/license

"These fonts are licensed under the Open Font License. You can use them in your products & projects – print or digital, commercial or otherwise."

simpleintheory 2 hours ago

Yeah, TIL, turns out they changed the license: it used to be under https://fonts.google.com/license/productsans

Riany an hour ago

the idea is good, but the examples still feel like a distance to handle real constraints and dimensions

nik282000 33 minutes ago

Website renders so poorly on my phone that I cant read half the text. Fits the bill for a slop project.

ironhaven 3 hours ago

A another take on this problem is zoo.dev . They wrote a brand new from scratch cad engine that is driven a custom openscad style language called kcl.

Then then have a trained llm that has can generate kcl to either create new parts or act as a llm assistant for changes to existing parts.

It’s neat that llms can do 3-D but I wonder how much of the problem is integration.