What Is a 3D Point Cloud Survey? E57, RCP, Revit and Scan-to-BIM Explained

A 3D point cloud survey creates a measurable digital record of a building, site or asset by collecting large numbers of 3D points in space. For architects, builders, engineers and BIM teams, the value is not the point cloud itself. The value is having a reliable spatial reference that can be measured, reviewed and converted into the format the project team actually needs.

The confusing part is that “point cloud” can describe several different deliverables. An E57 file, an Autodesk RCP project and a Revit RVT model are not interchangeable. Choosing the right output at the start can save a lot of conversion and rework later.

What does a point cloud contain?

At its simplest, a point cloud is a collection of XYZ coordinates representing surfaces captured by a laser scanner, LiDAR system or photogrammetry workflow. Depending on the capture system and file format, those points can also include colour, intensity and scan-position information.

A point cloud is useful because the geometry remains measurable. Teams can return to the dataset after site access has changed, check dimensions, review existing conditions and use the cloud as a reference for CAD or BIM modelling.

E57 vs RCP/RCS vs RVT

E57

E57 is an open 3D imaging exchange format standardised by ASTM. It can store 3D point data and associated information such as colour, intensity and imagery. Because it is not tied to one scanner manufacturer, E57 is a useful handover format when the client wants access to the captured point-cloud data beyond a single software ecosystem.

RCP and RCS

RCP and RCS are Autodesk ReCap point-cloud formats. Revit and AutoCAD work directly with RCP/RCS references. In practical terms, an RCP project can organise multiple scans or RCS files, while RCS stores indexed point-cloud data. If an AEC team works primarily in Autodesk software, an RCP/RCS workflow is often the most direct route into Revit or AutoCAD.

RVT

An RVT file is not a point cloud. It is a Revit project containing modelled BIM elements. Creating an RVT deliverable from captured conditions is the Scan-to-BIM step: the point cloud is used as the spatial reference, then walls, floors, roofs, structural elements and other agreed components are modelled into editable Revit objects.

Do you need the raw point cloud or a BIM model?

Not every project needs Scan-to-BIM. If the immediate requirement is measurement, condition review, coordination or archival access, a registered point cloud may be enough. If the design team needs editable building elements for redesign, documentation or coordination in Revit, a BIM model is usually the more useful downstream deliverable.

• Choose a point cloud when the captured geometry itself is the required reference.

• Choose Scan-to-BIM when the project team needs editable Revit geometry derived from existing conditions.

• Request both when you want the original measured dataset preserved alongside the interpreted BIM model.

What determines point-cloud accuracy?

The file extension does not determine accuracy. Accuracy depends on the capture equipment, scan geometry, registration method, control, site conditions and the workflow used to process the data. An E57 file can contain excellent data or poor data; the same is true of any other point-cloud format.

This is why a useful scope should define the required outcome before capture begins. A model intended for concept design has different requirements from a fabrication workflow, a deformation survey or a legally certified boundary survey.

Where point-cloud surveys are useful in AEC

• Existing-condition capture before refurbishment or redesign

• As-built documentation of completed or partially completed work

• Scan-to-BIM and Scan-to-CAD workflows

• Plant, services and complex geometry where manual measurement is inefficient

• Construction-stage records before elements are concealed

• Remote review and coordination where teams need measurable site context

What should you specify before commissioning a scan?

Before capture, agree on the areas to be recorded, the level of detail required, the coordinate requirements, the final file formats and what the data will be used for. If Scan-to-BIM is required, also define which elements need to be modelled and the expected modelling detail rather than assuming “a Revit model” means the same thing to everyone.

It is also important to distinguish reality-capture documentation from services that require statutory or professional certification. A point-cloud capture does not automatically become a cadastral survey, engineering certification or compliance inspection simply because the geometry is measurable.

A real Scan-to-BIM example

Kybos recently documented approximately 500 m² of external existing conditions in Belongil for architectural redesign, with the captured site delivered as a Revit RVT model and an interactive 3D record. Read the Belongil Scan-to-BIM case study for the project scope and deliverables.

Point-cloud survey services

Kybos provides point-cloud and 3D capture workflows for construction, existing conditions and design documentation across South East Queensland and the Northern Rivers. See our point cloud survey service or construction 3D scanning services to understand the available outputs and project stages.

Need an E57, RCP/RCS point cloud or a Revit model from existing conditions? Contact Kybos and specify how the data needs to be used downstream. That usually determines the right capture and deliverable workflow.