open-source cad kernel · rust · interval numerics
An open-source, NURBS-based
CAD kernel for the agentic engineering era.
Geop is a highly extendable CAD kernel written in Rust, with sound interval numerics. Bodies are smooth NURBS solids — it's SVG, but in 3D — backed by topology that supports non‑manifold modeling and booleans that don't miss intersections.
live examples
Shareable example links are coming soon — for now, these open the app itself.
the data model
A well-defined way of dealing with smooth 3D bodies.
Geop's bodies are NURBS solids, top to bottom — it's SVG, but in 3D. The closest existing analogue is a STEP file, a powerful but famously opaque format. Geop gives you the same expressive power through curves, surfaces, and topological data structures you can actually read and extend.
honest status
This is early. That's the point.
Right now Geop is a minimal MVP — booleans working reliably on 3D objects, backed by interval-bounded numerics. There are many ways to make it faster and more accurate, and that work is already underway.
What I want to find out right now is whether people are genuinely interested in this project. If you are, the roadmap below is where it goes next — and I'd like your help getting there.
on the roadmap
The best engineering suite for mechanical engineers — while they stay in control of their data.
- ☐Fillets & chamfers
- ☐Projection
- ☐Finite element simulation
- ☐Wire harness / cabling
- ☐Plugin systemso the community can contribute part libraries and new modeling tools
join the build
Looking for sponsors, angels, early investors, and founding engineers.
Geop's mission is to build a genuinely competitive open-source CAD program — and to establish it as common infrastructure the way numpy is for scientific computing. That's a long build. I'm looking for people who want to fund it, invest in it, or help build it from here.