■ MEP BIM INSIGHTS — POINT CLOUD

Point Cloud to BIM: A Step-by-Step Workflow for Retrofit and Renovation Projects

Renovation and retrofit projects present a problem that new construction does not: the existing building. Old drawings are inaccurate. As-builts are missing. Field conditions diverge from what anyone documented years ago.

Point cloud scanning solves this by capturing reality — not what was supposed to be built, but what is actually there. Combined with BIM modeling, it gives renovation teams an accurate, navigable 3D baseline before a single wall is opened.

---

Step 1: Laser Scanning the Existing Conditions

A 3D laser scanner (terrestrial LiDAR) is set up at multiple positions throughout the building. At each position, it rotates and captures millions of distance measurements in all directions, producing a dense cloud of points — each one representing a surface in the real space.

For MEP renovation work, the scanner captures:

• Existing ductwork, piping, and conduit runs
• Mechanical room equipment
• Ceiling heights and structural clearances
• Wall and floor conditions affecting routing

Scanning a typical floor of a commercial building takes 4–8 hours, depending on complexity.

Step 2: Point Cloud Processing and Registration

Raw scan data is processed using software such as Leica Cyclone, FARO Scene, or Autodesk ReCap Pro, producing a registered point cloud in one of three standard formats:

• .RCP / .RCS — Autodesk ReCap format, native to Revit
• .E57 — open exchange format, widely supported

At GEOMETRY-S, we accept point cloud files in .RCP, .RCS, and .E57 formats directly from the scanning contractor or the client.

Step 3: Point Cloud Import into Revit

The processed point cloud is linked into Autodesk Revit as a reference. The modeler can navigate through the scan data in 3D and in section, using the actual scanned geometry as a tracing reference.

Step 4: As-Built MEP Modeling

Working from the point cloud reference, the BIM modeler traces and models the existing MEP systems in Revit: ductwork, piping, electrical conduit, and mechanical equipment. Accuracy of the resulting model is typically within ±10mm of actual field conditions.

Step 5: New Design Overlaid on the As-Built Model

With the existing conditions accurately modeled, new MEP systems are designed directly within the same Revit environment. The as-built model becomes the collision boundary — the design team can see immediately where new ductwork conflicts with existing structure or equipment.

Step 6: Clash Detection and Coordination

The as-built model with new MEP overlay is exported to Navisworks for clash detection. Hard clashes between new work and existing conditions are identified and resolved before installation.

---

When Point Cloud to BIM Makes Sense

• You are renovating a building where as-built drawings are missing, incomplete, or unreliable
• The MEP scope involves significant new routing through occupied or constrained spaces
• You need to verify clearances for new equipment in existing mechanical rooms
• The project has a fixed budget and the client cannot absorb field-discovered condition change orders

Our Point Cloud to BIM Capability

GEOMETRY-S accepts point cloud data in .RCP, .RCS, and .E57 formats and delivers as-built MEP models in Revit (.RVT) with IFC export available. We have completed point cloud to BIM scopes on industrial facilities, healthcare buildings, multi-family residential, and commercial retrofits.