3D rendering glossary
3D scanning: what it is, how it works and applications
3D scanning is the process of capturing the shape, measurements and often the colour of a real object, environment or building and turning them into a three-dimensional model on the computer. Capture is done with a laser scanner, structured light or photogrammetry, and the result is a point cloud or 3D mesh used in architecture, industry and heritage.
How 3D scanning works
Every scanning process follows the same logic: measure thousands or millions of points on the surface of what you want to capture and record the position of each one in X, Y and Z coordinates. The set of these points forms the point cloud, which can later be converted into a mesh (polygons) and receive texture with the real colour.
- Planning: define what will be captured, the required accuracy and how many capture positions will be needed.
- Capture: the equipment records the object or environment from various angles.
- Registration: the various captures are aligned in a single coordinate system.
- Clean-up: removal of noise, people, cars and unwanted reflections.
- Processing: generation of the mesh, texture application or modelling over the point cloud (in BIM, for example).
- Export: formats such as E57, LAS, PLY, OBJ, FBX or native files from Revit and other programmes.
3D scanning technologies
| Technology | How it captures | Best use |
|---|---|---|
| Laser scanner (terrestrial LiDAR) | Measures distance with 360-degree laser pulses | Buildings, facades, architectural surveys, construction sites |
| Structured light | Projects light patterns and reads the deformation | Small and medium parts with high detail, industry |
| Photogrammetry | Calculates shape from many overlapping photos | Terrain, monuments, objects with rich texture |
| Drone photogrammetry | Georeferenced aerial photos | Topography, land subdivisions, surroundings of developments |
| Handheld scanner and LiDAR phones | Fast capture on the move | Indoor environments, quick measurements, lower accuracy |
Where 3D scanning is used
Architecture and construction
In renovations, retrofits and extensions, the laser scanner produces an accurate survey of what exists, including level differences, out-of-plumb walls and exposed services. The resulting model serves as the basis for the design and for BIM. On construction sites, scanning compares what has been built with the design and records progress.
In practice: Render Fabrik is a 3D architectural rendering studio working with clients in Brazil and Europe, with a quote within 24 hours.
Property market
Completed properties can be scanned to generate virtual tours and floor plans from the actual space. Drone photogrammetry captures the land and surroundings of a development, which helps insert the project into aerial views with accuracy.
Historic heritage
Churches, listed facades and monuments are scanned for documentation, restoration and promotion. The model preserves the exact shape even if the original suffers damage.
Industry and product
In industry, scanning is used for reverse engineering, quality control and creation of models for catalogues, e-commerce and augmented reality.
What to deliver and request in a scanning project
Before commissioning a scan, it is worth clearly defining what will be done with the result. For a renovation project, the useful deliverable is usually the registered point cloud and a BIM or CAD model with walls, openings and levels. For promotion, a lightweight textured mesh that opens in web viewers is more interesting. For architectural visualisation, the ideal is to receive the terrain and surroundings in a format compatible with the modelling software, with correct coordinates and scale.
Asking for the expected accuracy, file formats and coordinate system avoids rework.
Best practices and limitations
- Difficult surfaces: glass, mirrors and highly polished metals reflect the laser or light and create gaps. They often require treatment or manual modelling.
- Heavy files: point clouds of entire buildings take up many gigabytes. Processing needs to be planned.
- Fit-for-purpose accuracy: a LiDAR phone is fine for measuring a room; a historic facade survey requires a professional scanner.
- A point cloud is not a render: scanning captures the real shape, but the sales image still needs clean modelling, materials, lighting and post-production.
3D scanning and architectural visualisation
For a visualisation studio, 3D scanning is a starting point, not the final product. A survey of the land or an existing property ensures that the project appears in the right place, with the real surroundings. From it, the studio models and renders the external 3D images, produces the 3D virtual tour or builds an interactive virtual model with fidelity to the location.
Frequently asked questions
What is the difference between 3D scanning and 3D modelling?
Scanning captures something that already exists in the real world. 3D modelling builds the object from scratch on the computer, from drawings, plans or imagination. Often the two are combined.
What is a point cloud?
It is the set of points measured by the scanner, each with its position in space and, sometimes, its colour. Visually it resembles a 3D photograph formed by points.
Can you do 3D scanning with a phone?
Yes. Photogrammetry apps and phones with a LiDAR sensor can make simple captures of objects and environments. Accuracy is lower than professional equipment, but sufficient for references and approximate measurements.
Does 3D scanning replace a topographic survey?
In many cases it complements it. Drones and scanners generate detailed models of the terrain, but surveys with legal value still require a qualified professional and control points.