What Is a Point Cloud? A Plain English Guide

The One-Line Answer

A point cloud is a collection of millions of individual measurement points in three-dimensional space — each one recording the exact X, Y and Z position of a surface in a building or on a site. Together, these points form a highly accurate three-dimensional digital representation of the scanned environment.

Think of it as a three-dimensional photograph that you can measure. Where a normal photograph captures how something looks, a point cloud captures how something is shaped — its exact geometry, dimensions and spatial relationships — to millimetre accuracy.

Where Does a Point Cloud Come From?

Point clouds are produced by 3D laser scanners. The scanner fires laser pulses in all directions simultaneously, measuring the time each pulse takes to bounce back from a surface. Because light travels at a known speed, that time measurement converts directly into a precise distance — and with the scanner knowing the angle at which each pulse was fired, it can calculate the exact three-dimensional position of every surface it hits.

A single scan from a Leica BLK360 — the scanner we use at SurveyX — captures around 360,000 measurement points per second and completes a full 360° scan in 3–7 minutes. Multiple scan positions are taken throughout a building or site to ensure complete coverage, then registered (aligned) together in post-processing software to produce a single unified point cloud dataset.

What Does a Point Cloud Look Like?

When viewed in software like Autodesk ReCap or Leica Cyclone, a point cloud looks like a dense, three-dimensional cloud of coloured dots. The Leica BLK360 captures integrated HDR photography alongside the scan data, which is mapped onto the points to produce a colourised point cloud — so it doesn't just measure the space, it also looks like it.

You can fly through a point cloud in 3D, slice it at any height to produce a plan view, cut sections through it and measure any dimension directly from the data. The level of detail is extraordinary — individual bricks, mouldings, structural connections and surface textures are all visible and measurable.

What File Formats Is a Point Cloud Delivered In?

Point clouds are delivered in standard industry formats:

• RCP (Autodesk ReCap Project) — the native Autodesk format. Loads directly into Autodesk ReCap, AutoCAD and Revit. This is the primary delivery format for most projects and the one your design team will use if they work in Autodesk software.
• E57 — an open standard format that can be opened in virtually any point cloud or BIM application. Used where the design team works in non-Autodesk software (ArchiCAD, Bentley, Trimble etc.).
• LAS / LAZ — formats used primarily in GIS and topographical applications. Used for site surveys and geo-referenced datasets.

At SurveyX we deliver point clouds in RCP and E57 format as standard with every scanning survey.

How Do Architects and Engineers Use a Point Cloud?

In AutoCAD

RCP files can be loaded directly into AutoCAD as a point cloud underlay. The cloud appears in three dimensions and can be sliced at any height to show a plan view. Drawing production — tracing floor plans, elevations and sections from the point cloud — uses this slice view as the reference. Every wall, opening and feature can be traced with confidence because the point cloud shows exactly where everything is.

In Revit

Point clouds are linked into Revit projects via the Insert → Point Cloud workflow. The cloud appears as a three-dimensional reference dataset in all views — plan, section, elevation and 3D. When building an as-built BIM model, every wall, floor, ceiling and opening is positioned by snapping to the point cloud, ensuring the model accurately reflects the scanned building.

For Design Checking

Even after drawings and models have been produced, the point cloud remains available as a reference dataset. Design teams use it to check proposed interventions against the actual building geometry — verifying clearances, checking sightlines, confirming structural positions — without having to return to site.

Do I Need the Point Cloud, or Just the Drawings?

For most projects, the drawings produced from the point cloud are all you need. You receive clean DWG and PDF files that your architect can work from immediately — the point cloud is the tool we used to produce them, but you don't necessarily need the raw data itself.

However, there are situations where having the point cloud is genuinely valuable:

• Your design team works in Revit and wants to load the point cloud as a reference
• The project is complex and the design team wants to be able to query dimensions from the raw data
• The building is listed or historic and a complete three-dimensional record is valuable for future reference
• The project involves BIM coordination and the point cloud forms part of the federated dataset

At SurveyX, point cloud data is included free with every scanning survey — you receive the RCP and E57 files alongside your DWG and PDF drawings as standard.