Shared coordinates are the mechanism that allows multiple Revit models on a project — architectural, structural, MEP, site — to align correctly in a federated model. Errors in shared coordinate setup are among the most time-consuming to diagnose and fix mid-project.
Why This Matters
When models use different coordinate origins, linking them produces misaligned geometry that looks correct when viewed individually but does not align in a federated view. On multi-building or campus projects, shared coordinates are the only reliable way to maintain correct relative positions between buildings.
Practical Guidance
Survey Point vs Project Base Point: The Survey Point represents a real-world geographic location. The Project Base Point is the project's internal origin. Shared coordinates are defined by the Survey Point. All disciplines must export IFC from the Survey Point, not the Project Base Point.
Acquiring Coordinates: The architectural model sets the shared coordinates. All other discipline models acquire coordinates from the architectural model by linking it and using the Acquire Coordinates command. Never set coordinates independently in a discipline model.
Multi-Building Projects: On campus or multi-building projects, each building Revit model uses the same shared coordinate system (site survey datum). This allows all buildings to be federated in a site Navisworks model with correct geographic positions.
After Coordinate Changes: If the architectural model's shared coordinates are changed after linked models have acquired them, all linked models must re-acquire coordinates. Notify all discipline modelers before any shared coordinate adjustment.
Checklist
- Set shared coordinates in architectural model before first discipline model is created
- All discipline models acquire coordinates from architectural — never set independently
- Notify all modelers before any shared coordinate change
- Verify alignment in federated Navisworks model after coordinate setup
LUA BIM LABS Insight
Shared coordinate setup is a one-time decision that affects every model on the project — do it correctly at project start and treat changes as formal change events.
LUA BIM LABS — Products & Services
Personalized MEP BIM Tutor (Starter Plan)
One practical MEP BIM lesson every day via Telegram. Written for beginners and early-stage BIM learners who want a steady learning habit.
Starter Plan: USD 39/month.
BIM Command Center for Revit (Add-in)
A Revit Add-in with 30+ automation features for MEP BIM — clash filtering, tag batch, space validation, COBie export, and more. Compatible with Revit 2019–2027.
댓글 없음:
댓글 쓰기