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Bunyan

in development · source public

In development. Access depends on the product.

BIM authoring in development, using a B-Rep geometry kernel in the browser.

Read the source · AGPL-3.0-only Discuss the development roadmap

Bunyan is a BIM authoring project in development. It uses an Open CASCADE kernel compiled to WebAssembly and stores projects as parametric recipes. The source is available for technical evaluation; the authoring catalogue and export workflows are still being developed.

Development scope

  • Parametric project definitions and B-Rep geometry operations
  • Element identity and revision history for supported edits
  • Quantity calculations from supported model geometry

Interoperability

What this product reads and writes, and where each format stands.

IFC 4.xreadsimplementedsupported representations via IfcOpenShell
Project recipe (.bnn)reads + writesimplemented
IFC 4.xwritesin development

Technical details

  • Parametric document model — Project definitions store objects, parameters and references. Geometry and display views are derived from those definitions.

    implemented

  • Element identity and revisions — The document model is designed to retain element identity through supported edits and record changes in a revision history.

    implemented

  • Geometry and quantities — Geometry operations use the underlying B-Rep model rather than the display mesh. Results remain subject to kernel tolerances, supported geometry and input quality.

    implemented

  • Command interfaces — The command layer is intended to support both interactive tools and agent-driven operations.

    implemented

  • Authoring catalogue — The catalogue of authorable elements and export workflows are still in development.

    in development

Limitations

Current limitations and evaluation requirements.

  • In development. There is no hosted application; the source is available for technical evaluation.
  • Supported geometry, edits and exchange workflows require version-specific evaluation. Quantities depend on model completeness and the applicable measurement rules.