3D Musketeers // Scanning Series

How 3D scanners actually see

Six ways to turn a real object into measurable 3D data, one animated schematic each, drawn from the gear we run in our Tampa shop. Every scanner here is working on the same part: a 3D-printed plaque of our logo, the same mark our printers trace on the kinematics page. The small inset shows what the scanner's own camera sees - that view is the whole trick. Chips light up as each part of the system works. Press Focus on any section for a full-screen view.

Handheld structured light

projected pattern / two cameras / sweep by handIn our shop: Artec Spider, Eva, Leo

A projector throws a known stripe pattern onto the object. Seen from the cameras beside it, the stripes bend wherever the surface bulges or dips. The amount of bend at every pixel is turned into depth by triangulation, thousands of times a second, while you sweep the scanner by hand. The Leo shows the scan building on its own screen as you go.

Projector Cameras Triangulate

Best for: Parts from a coin to a car panel, people, anything you can walk around; reverse engineering, inspection, full-color archives
Pros: Fast, dense, full color, no marker dots on most parts, works on site; our Spider is accurate to 0.05 mm
Cons: Needs line of sight; very shiny, black, or clear surfaces need a matte spray; a steady hand matters

stripe bend -> depth one frame = thousands of points

Turntable structured light

fixed head / the part turns / desk scaleIn our shop: Matter and Form THREE

The same stripe-projection idea, with one difference: the scanner never moves. The part sits on a motorized turntable that steps around in known angles, and the head captures at every stop. Because each frame comes from a fixed, calibrated position there is no hand shake and no drift between passes. Flip the part once for the underside and the software stitches both.

Projector Cameras Turntable Align

Best for: Desk-sized parts that have to be exact: machined components, castings, molds, small products, museum objects
Pros: The most accurate way we have to scan a desk-sized part; hands-free and repeatable; full color
Cons: The object has to fit on the table; undercuts and the underside need a second orientation; it stays on the desk

known angle + fixed camera -> every frame already aligned

Blue laser + IR handhelds

laser lines / markers / infrared mode / deep-hole lineIn our shop: Creality Raptor, Creality Pika, AI Scan 01

Several thin blue laser lines sweep the part at once while two cameras watch them bend. A laser line stays crisp on shiny or dark metal where a projector washes out. Small marker dots around the part give the scanner fixed reference points, so even featureless surfaces track. Switch to IR mode and it projects an invisible speckle pattern instead: no markers, bigger objects, faster coverage. A single-line mode reaches down bores and slots (here, the plaque's mounting hole) - that one line is what the old single-laser scanners were, now bundled in.

Blue lines IR speckle Markers Cameras

Best for: Machined and cast metal, engine and powersports parts, molds, dark or glossy things that fight a projector
Pros: Cuts through glare; high-accuracy on small parts; IR mode covers big objects without dots; light and cheap enough to carry anywhere
Cons: Blue mode wants markers on plain parts; color capture varies by model; a smaller sweet spot than the Leo

blue lines: shiny metal, markers IR speckle: big, no markers one line: deep holes

LiDAR / time of flight

laser pulse / stopwatch / spinning mirror / 3D cloudIn our shop: Artec Ray

The scanner fires a laser pulse, times how long it takes to bounce back, and turns that time into distance (light covers a meter in about three billionths of a second). A mirror spins the beam up and down while the head turns, so one tripod setup paints the whole space - floor, walls, objects, ceiling - as a 3D point cloud.

Pulse Mirror (up/down) Head (around) Timer

Best for: Buildings, crash scenes, bridges, stadiums, factory floors, anything too big to walk a handheld around
Pros: Enormous range from one spot; works outdoors; millions of points in minutes
Cons: Coarser than handhelds, so no fine detail; shadows behind objects need extra setups; heavy tripod kit

distance = c x time / 2 c = 299,792,458 m/s

Photogrammetry

many photos / matched features / solved camerasIn our shop: Artec Studio

No projector, no laser - just dozens of overlapping photos. Software finds the same surface detail in several photos, works out where each camera must have been standing, and intersects the sight lines to place every point in 3D. It is how you scan a mountain with a drone or a statue with a phone. We run it inside Artec Studio, usually to add fine color or to tie a handheld scan to a bigger scene.

Shutter Match Solve

Best for: Large textured things: terrain, buildings, sculptures, film and game assets
Pros: Any camera works; best color and texture of any method; scales from a ring to a city
Cons: No true size without a reference scale bar; fails on plain, shiny, or see-through surfaces; hours of computing

same point in 2+ photos -> sight lines cross -> 3D point

Industrial CT

x-ray / rotating part / reconstructed volumeThrough our partner: Lumafield

Every method above only sees the outside. CT shoots x-rays through the part while it turns on a stage; a detector records a shadow at each angle. Software stacks hundreds of those shadows into a solid volume, so internal channels, voids, and hidden cracks show up as clearly as the outer skin. Here it sees the honeycomb infill inside the printed plaque and an air pocket you would never spot from outside. When a job needs it, we run it through Lumafield and hand you the results.

X-ray tube Rotary stage Detector Reconstruct

Best for: Internal features, porosity in castings and 3D prints, sealed assemblies, failure analysis
Pros: The only way to measure inside without cutting; captures inner and outer surfaces in one go
Cons: Lab equipment, not portable; part size and density limits; the most expensive scan per part

shadows at 360 angles -> volume of voxels -> slice anywhere

At a glance

pick by object, not by gadget

Swipe sideways to see all columns

Method	Fine detail	Speed	Object size	Color	Shiny / dark	Inside the part	Where
Handheld structured light	High	Fast	Coin to car	Yes	Spray first	No	Shop or on site
Turntable structured light	Highest, desk scale	Medium, automatic	Fits the table	Yes	Spray first	No	Desk
Blue laser + IR	High	Fast	Part to vehicle	Varies by model	Good	No	Shop or on site
LiDAR	Low	Fast	Room to stadium	Camera overlay	Good	No	On site, tripod
Photogrammetry	Medium	Slow	Ring to city	Best	Poor	No	Anywhere
Industrial CT	High	Slow	Small to medium	No	Irrelevant	Yes	Partner lab

Rule of thumb from our shop: small and detailed, handheld structured light. Desk-sized and it has to be exact, the turntable. Shiny metal, blue laser. Big and far away, LiDAR. Need the inside, CT. Not sure? Tell us about the object and we pick.