smlibpy
A Python library for 3D modeling on the SMLib NURBS kernel with an API inspired by cadquery and build123d.
It comes with an MCP server, so your agent can build parts too.
from smlibpy import *
plate = Box(80, 60, 10)
plate = plate.fillet(plate.edges().parallel_to(Z), 8)
plate -= GridLocations(60, 40, 2, 2) * Cylinder(4, 10)
plate -= Rectangle(30, 20).on(plate.faces().top()).extrude(-4)
plate.export("plate.step")
show(plate)
Parts are B-reps with exact surfaces: planes, cylinders, cones, spheres, tori and NURBS.
Volumes, areas and inertia are integrated over those surfaces, and STEP files keep them as they
are. You combine shapes with +, - and &, and every feature returns a new part. Faces and
edges are picked by their geometry, for example part.faces().top() or
part.edges().parallel_to(Z).concave(). The plate above builds in about 40 ms.
Features
- Modeling: primitives, holes and patterns, Booleans, extrude (also tapered), revolve, loft, sweep (also along helices), shell, offset, draft, mirror, split, thicken
- Fillets: circular, variable-radius and curvature-continuous (G2/G3); chamfers
- Sketches and curves: rectangles, circles, ellipses, polygons, slots, trapezoids; lines, arcs, splines, Béziers, helices; 2D fillet and offset
- Surfaces: freeform surfaces from point grids, ruled surfaces, stitching into solids
- Selection by geometry:
top(),parallel_to(),concave(),circles(),largest(), filters, sorting and grouping - Measuring: volume, area, center and inertia from the exact surfaces, exact distances, intersections, validity
- Checks: every kernel result is checked; a fillet or shell that cannot work raises an error that says what fits
- Files: STEP in and out (exact geometry, assemblies, units, names, colors), STL, glTF/GLB, OBJ, SMLib's own format
- Pictures: a software renderer, no GPU or browser needed: shaded views, technical drawings (ISO E and A) with hidden lines and center lines, sections, x-ray, highlights, markers, zebra stripes, curvature maps, image diffs
- Agents: an MCP server with a live viewer, snapshots and a tested guide for every function, and a Claude Code plugin
Install
pip install smlibpy
There are wheels for Linux (x86_64, aarch64), macOS (arm64, x86_64) and Windows, for Python
3.10 to 3.14, with the kernel compiled in. They are 5 to 7 MB. For agents, pip install "smlibpy[mcp]" adds the
MCP server; see AI agents.
To build from source you need CMake and a C++17 compiler (about a minute on a laptop):
git clone --recursive https://github.com/awv-informatik/smlibpy
cd smlibpy
pip install .
For agents
The MCP server lets Claude and other agents model with smlibpy. In Claude Code:
claude plugin marketplace add awv-informatik/smlibpy
claude plugin install smlibpy@smlibpy
Other hosts start uvx --from "smlibpy[mcp]" smlibpy-mcp; see AI agents. The
agent works in four steps:
- A skill tested on the real kernel: every function has a guide, written by agents that ran each call and wrote down what they found. The server hands the guides out, and its search knows CAD synonyms.
- One script per step: the agent writes a whole step as a Python script and runs it. The session keeps the model between scripts; a kernel crash costs a restart, and the session is rebuilt from the scripts that made it.
- A renderer to look with:
snapshotdraws the model in software, as technical drawings with hidden lines, sections, x-ray, highlighted selections, markers, zebra stripes or curvature maps. - Loops until it is right: after every step the agent checks numbers and pictures, fixes what is off, compares before and after on a pinned frame, and goes back to a checkpoint when a step fails.
A short tour
Sketches
Sketches are 2D regions. Place them on a plane or a face, then extrude, revolve, loft or sweep them.
profile = Polygon((25, 0), (60, 0), (60, 12), (35, 12), (35, 40), (25, 40))
flange = profile.on(Plane.front).revolve(Z)
flange -= PolarLocations(47.5, 8) * Cylinder(5, 30)
Selecting edges and faces
Selectors chain and always return lists. A list with one element works wherever a single shape is expected.
flange = flange.fillet(flange.edges().concave(), 4)
flange = flange.chamfer(flange.faces().top().edges().circles(), 1)
Fillets
Fillets can be circular, vary in radius, or be curvature continuous.
box = Box(30, 20, 10)
soft = box.fillet(box.edges(), 3, continuity="G2")
ramp = box.fillet(box.edges().parallel_to(Z).first, (1, 4))
Surfaces
Open curves make surfaces. You can stitch them, thicken them, or start from a grid of points.
import math
grid = [[(x, y, 4 * math.sin(x / 15) * math.cos(y / 15)) for x in range(0, 60, 10)] for y in range(0, 50, 10)]
panel = surface(grid).thicken(2)
Measuring
mp = flange.mass_properties(density=7.85e-3) # steel, g/mm³
mp.mass, mp.center, mp.inertia
Files
STEP, STL, glTF/GLB, OBJ and SMLib's own exact format.
export_step([flange, panel.named("panel")], "parts.step")
export_glb(flange, "flange.glb")
Documentation
- Getting started
- Concepts: shapes, planes, locations, selections
- Sketches, parts, features, surfaces
- Measuring and analysis, files and viewer
- Examples
- The kernel: how smlibpy uses SMLib, accuracy, limitations
- AI agents: the MCP server, so Claude and other agents can model with smlibpy
Status
smlibpy is new (version 0.1). It covers solid and surface modeling, and reads and writes STEP with the exact geometry. Assemblies with product structure, dimensioned 2D drawings and text are not there yet.
License
smlibpy is MIT licensed. It builds and bundles the SMLib kernel from NVIDIA-Omniverse/usd-brep, © NVIDIA, under the Apache License 2.0; see NOTICE.
1 maintainer
Metadata
1 maintainer
Release files for smlibpy 0.1.4
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Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| smlibpy-0.1.4.tar.gz | 11.2 MB | Details |
Built distributions (wheels)
Total release size: 135.5 MB
Release files / smlibpy-0.1.4.tar.gz
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Transparency logRelease files / smlibpy-0.1.4-cp311-cp311-macosx_11_0_arm64.whl
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| Size | 6.6 MB |
| Tags | CPython 3.10 Linux glibc 2.26+ ARM64 Linux glibc 2.28+ ARM64 |
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| Size | 5.8 MB |
| Tags | CPython 3.10 macOS 11.0+ x86-64 |
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| Size | 5.2 MB |
| Tags | CPython 3.10 macOS 11.0+ ARM64 |
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