Native IFC 4.3 · Built on Blender and IfcOpenShell · Contributed upstream
Cross-Sections
AASHTO-compliant templates with parametric lane widths, shoulders, and side slopes.
Native IFC 4.3
True native IFC authoring. Infrastructure designs are IFC from creation, not converted after the fact.
Blender Powered
Built on Blender’s 3D platform. Free, open-source, and production-capable.
What the work covers
Infrastructure modelling capability for horizontal civil engineering, authored natively in IFC.
Alignment Tools
- Horizontal and vertical alignment creation
- Curve and spiral calculations
- Station equations and references
Cross-Sections
- AASHTO-compliant templates
- Parametric lanes, shoulders, slopes
- Superelevation calculations
Native IFC 4.3
- Direct IFC authoring (not conversion)
- Full IfcAlignment support
- Interoperability with major BIM platforms
Corridor Modeling
- 3D corridor generation
- Terrain integration
- Profile view overlay
What Saikei Civil is
Saikei Civil (栽景) is the name I give to my own contributions extending native-IFC authoring to civil infrastructure. It is not a standalone product, and no party holds exclusive rights in it. The work is contributed upstream into Bonsai and IfcOpenShell, and lives under those projects’ licenses.
Built natively on IFC 4.3, designs travel between applications and remain accessible throughout the asset lifecycle.
Upstream
- #9304 — horizontal alignment authoring foundation for Bonsai, plus alignment API fixes · opened August 15, 2026
- #9305 — Windows build artifact collection for underscore-prefixed plugin DLLs · opened August 15, 2026
This is my Google Summer of Code 2026 project.
About the Project Capabilities
Michael Yoder, PE · Meridian, Idaho