sand3d

smlibpy is a Python library for 3D solid and surface modeling on the SMLib NURBS kernel. Its value-based API follows build123d's algebra mode: primitives and sketches produce parts, operations return new parts, and Boolean operations can be written with +, - and &. Sketches can be extruded, revolved, lofted or swept, while features include holes, pockets, fillets, chamfers, shelling, sheet-metal bends, deformation and draft operations. Parts use exact B-rep surfaces, including planes, cylinders, cones, spheres, tori and NURBS; volumes, areas and mass properties are computed from those surfaces, and the library supports geometry-aware selection of faces and edges. It reads and writes formats including STEP, USD BrepArray bodies, DXF, STL, glTF/GLB and OBJ, and provides rendering, technical drawings, sections and model inspection. The package includes an MCP server for agent-driven modeling, with function guides, scripted modeling steps, snapshots and validation loops. The same API is available in the browser and Node through the related smlibwasm WebAssembly package. smlibpy is distributed through pip with compiled wheels for common platforms and Python 3.10–3.14; the base package uses NumPy as its stated dependency. The project is MIT licensed and bundles the SMLib kernel from NVIDIA-Omniverse/usd-brep under the Apache License 2.0.

Amagine3D is an open-source 3D capability layer for hardware creation, developed by Amagine. Its parametric CAD workflow turns natural-language hardware requirements, reference images, and key dimensions into editable enclosures and assembly structures around internal components, producing Python and build123d source code alongside STEP, STL, or color-aware 3MF exports. A 3D-native agent first organizes the requirements into a design brief, then runs the generated source in a browser geometry runtime. It uses the resulting model state and check results for dimensions, part connectivity, interference, and motion clearance to revise or accept the design. The workflow supports multipart structures such as covers, hinges, and latches, including assembly clearances and printing tolerances. Generated parameters can be adjusted in the workbench and written back to the source without regenerating the model. The system can preview, measure, modify, and save complete designs and their check reports.

Procedura is an open-source agentic 3D-modeling tool from SpatiaOS that converts text prompts into editable procedural assemblies rather than point clouds or triangle meshes. It generates OpenSCAD source with named parts and typed mates, plans and builds parts incrementally, and can use reference images and optional Blender render feedback during refinement. Optional passes assign per-part PBR materials and plan articulation, exporting motion to OpenUSD and URDF with Isaac-based validation. It runs locally as a Bun/TypeScript pipeline using a configurable OpenAI-compatible, Gemini, or local model endpoint; it does not provide hosted inference or API keys. The pipeline uses a Manifold-capable OpenSCAD build to compile the generated programs and Blender for renders, and includes a web Studio for composing runs and inspecting intermediate artifacts. The repository is MIT-licensed.

Box3D is an open-source 3D physics engine for games, written in portable C17. It provides rigid-body simulation with collision detection, continuous collision detection, contact events, convex hulls, capsules, spheres, triangle meshes, height fields, multiple shapes per body, collision filtering, ray and shape casts, overlap queries, sensors, and a character mover. Its physics system includes a robust Soft Step rigid-body solver, continuous physics, island-based sleeping, and revolute, prismatic, distance, motor, weld, and wheel joints with limits, motors, springs, friction, and force events. The data-oriented system uses multithreading and SSE2 or Neon SIMD, supports cross-platform determinism and recording and replay, and is optimized for large piles of bodies. The core library has no dependencies beyond the C runtime and libm on Unix, can be integrated with CMake as the box3d::box3d target, and builds on Windows, Linux, macOS, and WebAssembly; its samples use sokol and Dear ImGui.

text-to-cad is a library of agent skills for creating, inspecting, sourcing, slicing, previewing, and handing off CAD, CAE, CAM, robotics, and hardware-design artifacts from local project files. Its skills generate and edit CAD models from plain-language or image requests, primarily producing STEP files with optional STL, 3MF, and GLB exports; preview local CAD and robot files in a browser; source off-the-shelf STEP parts; and create DXF drawings from Python sources or CAD geometry. Additional skills write URDF robot structures, SRDF/MoveIt2 planning and collision data, and SDF simulator models and worlds; check DXF and STEP files for SendCutSend; measure mesh printability by wall thickness, overhangs, support volume, and build orientation; slice supported meshes into validated, printer-profiled FDM G-code using slicer command-line tools; and dry-run, upload, and cautiously start local Bambu Lab print jobs. An experimental implicit-CAD skill creates browser-native models with GLSL signed-distance fields and CAD Viewer raymarch rendering. The library is installed with the Skills CLI, including `npx skills add earthtojake/text-to-cad`, or through provider-native plugins for Codex, Claude Code, and Grok Build.