Choosing the right 3D scanning method can make or break a project. Laser scanning, structured light scanning, and photogrammetry all capture real-world objects as digital 3D data, but they differ in accuracy, speed, cost, and the kinds of parts they handle best. After more than two decades of scanning everything from machined metal parts to sculptures at our Glendale studio, we can tell you the “best” scanner is simply the one matched to the object in front of it. Here is how we decide, and how you can too.

How Laser 3D Scanning Works

Laser scanners sweep one or more laser lines across an object while sensors measure how the lines deform over the surface. Each pass captures millions of points, which software stitches into a precise mesh. Laser scanning is the workhorse for engineering applications: it handles medium to large parts, works in varied lighting, and delivers the tight tolerances needed for inspection and reverse engineering. If your end goal is a CAD model that has to fit an existing assembly, laser scanning is usually where we start.

How Structured Light Scanning Works

Structured light scanners project a pattern of light, typically stripes or grids, onto the object while cameras record how the pattern bends. From that distortion the software computes highly detailed geometry in seconds per shot. Structured light excels at small to medium objects with fine surface detail: jewelry, dental models, consumer product housings, and artistic pieces. Resolution is excellent, and because the scanner captures a full field of view at once rather than a moving line, small parts digitize very quickly.

Where Photogrammetry Fits In

Photogrammetry builds a 3D model from dozens or hundreds of overlapping photographs taken from different angles. Its two big advantages are scale and color: it can capture objects as large as vehicles, rooms, or building facades, and it records full-color texture that laser and structured light systems typically do not. The trade-off is dimensional accuracy, which is lower and less predictable than the other two methods. We reach for photogrammetry when visual realism matters more than engineering tolerances, such as scanning for animation, AR/VR assets, archiving, or props.

Comparing the Three 3D Scanning Methods

Accuracy: laser and structured light both reach into the tens of microns on well-behaved surfaces; photogrammetry is generally in the sub-millimeter to millimeter range. Object size: structured light favors small and detailed, laser covers small through large, photogrammetry scales the largest. Color capture: photogrammetry wins clearly. Cost: photogrammetry is usually the most economical, with laser and structured light priced similarly per project.

Reverse engineering and inspection

Choose laser or structured light. Both produce watertight, dimensionally reliable meshes we can convert into parametric CAD for manufacturing.

Art, heritage, and visual media

Choose photogrammetry, or pair it with structured light when you need both fine geometry and true color.

A Note on Difficult Surfaces

Shiny, transparent, and very dark surfaces scatter or absorb projected light, which challenges laser and structured light scanners alike. A temporary matte developer spray solves this in most cases and wipes off cleanly afterward. Deep pockets and internal channels may be impossible for any optical scanner to see; in those cases we combine scan data with manual measurement to complete the model.

Not Sure Which Method You Need?

You do not have to pick the technology yourself; that is our job. Send us photos of your object, its rough dimensions, and what you plan to do with the file, and we will recommend the right approach and a firm price. eCadCam has offered professional 3D scanning in Los Angeles for over 22 years, with laser, structured light, and photogrammetry all in-house at our Glendale studio, plus CAD modeling to turn scans into manufacturable designs. Request a free quote today at 213.489.1173.