Use a coding agent - OpenGeometry

A coding assistant trained on older code often writes OpenGeometry 2.0: new Cuboid(...), new Vector3(...), setPlacement(...). None of that exists in 3.0. Give the assistant these pages and the rules below.

Sources to give the assistant

Source	Use it for
`/llms.txt`	The index of these docs, one line per page
Any page with `.md` added to its address	That page as plain Markdown
`node_modules/opengeometry/index.d.ts`	Every export and its types, for the installed version
`node_modules/opengeometry/README.md`	A compact reference of every call
Examples	Working 3.0 code

The contextual menu at the top of each page copies the page or opens it in an assistant.

Rules to put in the prompt

This project uses OpenGeometry 3.0 (npm package "opengeometry").
- Await OpenGeometry.create(input, options) once before making any body. workerURL goes in the second argument.
- Make bodies with new Wire(kind, params), new Solid(kind, params) or new Sheet(OG_OPERATION_SWEEP, params).
  kind is an OG_PRIMITIVE_* or OG_OPERATION_* constant.
- Points and vectors are [x, y, z] arrays. Units are metres. Y is up.
- A Profile point [u, v] on the default ground plane lands at world (u, 0, -v).
- Move bodies with body.transform(OG_TRANSFORM_*, params). Do not set position, rotation or scale.
- solid.operate(kind, { tools }) changes the target once. Tools stay separate live solids.
- A shape shared by instances needs { instances: 'all' } or makeUnique() before an edit.
- Add bodies to the THREE.Scene yourself. A SystemAssembly is not a Three.js object.
- Surfaces use MeshStandardMaterial, so the scene needs a light.
- Catch OGError and branch on error.code.
- Do not use Cuboid, Polygon, Opening, Vector3, setPlacement, STL, PDF, IFC file text, projection or loft: they are not in 3.0.

Check the result

Ask the assistant to run the type check. A call to a 2.0 class fails at compile time against the 3.0 types. Then run the page in a browser: a missing light gives a black body, and a missing create throws NotInitialised.

Last modified on November 10, 2026