Portable 3D Scanners and LiDAR Sensors

Accuracy, speed and the light source behind them

Quoted accuracy ranges from about 0.02 mm to a few centimetres, and the gap reflects different jobs. Structured-light scanners using blue light or laser stripes capture small and medium objects in fine detail, while LiDAR measures rooms and large scenes at centimetre-level accuracy. Scan speed is stated in frames per second or points per second; more speed makes handheld scanning forgiving, because tracking holds as you move. Dark, shiny or transparent surfaces defeat most optical scanners, so many users dust such parts with scanning spray first.

Output formats and software decide what you can do next

A scan is only useful if the next program can open it. STL suits 3D printing, OBJ and PLY keep colour and texture, and point-cloud formats such as LAS, E57 or XYZ feed surveying and CAD tools. Most scanners work through their own software, so check which operating system it runs on and how powerful the computer must be. Some listings are robotics sensors with ROS drivers rather than object scanners; they stream depth or range data and do not produce a finished mesh on their own.

Questions about Portable 3D Scanners and LiDAR Sensors

Can a 3D scanner capture a whole room?

Object scanners are usually built for parts up to roughly human size. For rooms, look at LiDAR units, which trade fine detail for range, or at scanners that state a working distance of several metres.

Do I need a powerful computer for scanning?

Often, yes. Processing dense point clouds into meshes is demanding, and some scanner software lists graphics-card or memory requirements. Check the software requirements against your computer before choosing a model.

How accurate do I need the scanner to be?

Match it to the job. Reverse-engineering a small mechanical part calls for accuracy around a tenth of a millimetre or better, while scanning a person, a sculpture or a room for visualisation is fine with a few millimetres or more.