FAQ

3D scanning is the process of using lasers, structured light, or photogrammetry to capture the precise shape, surface, and dimensions of a real-world object or space and convert it into a digital 3D model, often called a “point cloud” or mesh. Direct Dimensions has been performing high-accuracy 3D scanning since 1995, converting raw scan data into CAD-ready models for engineering, manufacturing, art conservation, architecture, and entertainment applications.

Accuracy depends on the equipment and application: handheld structured-light scanners typically capture in the range of tens of microns to a fraction of a millimeter, while dedicated metrology tools like the FARO Arm reach accuracy as low as 23 microns, and desktop systems like the Artec Micro II reach 5-micron accuracy. Direct Dimensions selects the right scanner for each job based on the object’s size and the precision your application requires.

3D scanning converts physical objects and environments into precise digital models, a process also called reality capture, as-built documentation or geometric digitization. Common applications include reverse engineering parts that no longer have original drawings, quality inspection and dimensional verification against CAD files, custom fabrication where new parts must fit existing geometry, heritage preservation and digital archiving, as-built documentation for renovation and BIM workflows, 3D printing source files, medical and orthotics fitting, forensic documentation and visual effects or game asset creation. If your project involves measuring, replicating or digitizing something physical, 3D scanning is likely the right tool.

Reverse engineering is the process of recreating an accurate CAD model of a physical part or object that has no existing design file, often because the original drawings are lost, the part was hand-built, or it has been modified over time. Direct Dimensions scans the physical object, then uses software such as Geomagic Design X to rebuild it into fully editable, manufacturable CAD geometry.

A digital twin is a highly accurate 3D digital replica of a physical object or environment, built from 3D scan data. It can be used for analysis, simulation, documentation, visualization, or as the basis for manufacturing a replacement part. Direct Dimensions creates digital twins for equipment, vehicles, buildings, and artwork.

A point cloud is the raw set of X, Y, Z coordinates captured directly by a scanner. A mesh connects those points into a solid surface (typically a triangulated .STL or .OBJ file). A CAD model goes a step further, converting that surface into parametric, editable solid geometry (such as a SolidWorks or STEP file) that engineers can modify and use for manufacturing. Direct Dimensions can deliver data at any of these three stages depending on your project’s needs.

Laser scanners project a laser line across a surface and measure the reflection for high-precision, metrology-grade data, ideal for industrial parts and reverse engineering. Structured-light scanners project a pattern of light to capture full-color, detailed geometry quickly, and are well suited to organic shapes like sculpture or the human form. Photogrammetry builds a 3D model from overlapping photographs and is useful for very large or hard-to-reach subjects, including drone-based capture of buildings or terrain. Direct Dimensions uses all three methods, often in combination, depending on the object and the desired output.

Photogrammetry reconstructs 3D geometry from overlapping photographs using software algorithms. It is cost-effective, captures rich color texture and scales well to large outdoor subjects, though accuracy depends on image quality, lighting and ground control. Laser scanning emits laser pulses and measures return time to build a precise point cloud directly. It is faster for large environments, works in low light and typically delivers higher geometric accuracy, making it well suited to architecture, engineering and construction work. The terms lidar and laser scanning are largely interchangeable in professional practice, with lidar more common in geospatial and aerial contexts. For many projects the two technologies complement each other.

A traditional CMM requires the part to be brought into a temperature-controlled lab and typically captures individual measured points. Portable options like the FARO Arm bring fixed-CMM-grade accuracy directly to the part on the shop floor and can capture millions of non-contact points for full surface inspection, not just discrete points, making it faster for both reverse engineering and quality inspection work.

Every scanner design involves trade-offs between accuracy, working volume, speed, portability, surface compatibility and cost. A high-resolution structured light scanner excels on small detailed industrial parts in a controlled environment but struggles outdoors. A long-range terrestrial laser scanner can map an entire building interior quickly but will not resolve fine surface detail on a small component. A handheld laser scanner offers flexibility and portability but may sacrifice some accuracy compared to fixed systems. Matching the scanner (or scanners) to the project rather than defaulting to the most expensive or most familiar tool is a core part of what we do.

You can submit a quote request through the Direct Dimensions website describing your object, goals, and desired output, or contact the team directly at info@directdimensions.kinsta.cloud or 410-998-0880. Direct Dimensions is based in Owings Mills, Maryland, and its mobile scanning teams travel on-site nationwide.

The more context you can share upfront the more accurate and useful your quote will be. Most helpful is a description or photos of what needs to be scanned, the approximate size, what the data will be used for, the accuracy or tolerance requirements if known, the deliverable format you need, any access constraints or scheduling requirements and whether the object has reflective, transparent or very dark surfaces. You do not need to have all the answers before reaching out and we’ll ask the right questions during the consultation.

Turnaround time varies based on the object’s size, complexity, and the deliverable required. A simple scan may take an hour, while full reverse-engineering or large architectural projects can take several days or weeks. Direct Dimensions can provide a project-specific timeline as part of your quote.

Cost depends on the size and complexity of the object, the accuracy required, and how the resulting data will be used. Direct Dimensions offers a lower-cost, streamlined service for straightforward scanning projects, as well as full-service engineering and CAD modeling engagements for more complex needs. The best way to get an accurate estimate is to submit a quote request describing your project.

Raw scan data, typically a point cloud, is processed and cleaned to remove noise, fill gaps and align multiple scans into a single registered dataset. Depending on your needs we then generate deliverables such as a polygon mesh (STL or OBJ), a native CAD, a BIM model (like Revit), a 2D drawing, an inspection report with color deviation maps or a georeferenced point cloud (E57). We discuss deliverable format at the start of every project because the intended downstream use determines the most useful output.

Deliverables can include mesh formats (.STL, .OBJ, .PLY), CAD-native and neutral formats (STEP, IGES, SolidWorks, and others), and web-friendly formats for platforms like Sketchfab or Matterport for online viewing. The right format depends on how the data will be used downstream. Direct Dimensions will recommend a format based on your project goals.

Yes. Once the project is delivered you own the scan data outright, including the point clouds, meshes and any derivative files we produce. We do recommend clients keep their own archived copies of the raw data, as scan files can be large and we do not offer indefinite cloud storage as a standard service. If you have specific data handling, confidentiality or IP requirements, which are common in aerospace, defense and medical contexts, we are happy to address those before work begins.

Yes. Direct Dimensions has documented buildings, statuary, and artwork for preservation and digital archiving purposes, including projects like the 3D documentation of St. Wenceslaus Catholic Church in Baltimore and sculpture by artists such as Matisse and Degas. This work supports virtual tours, restoration planning, and permanent digital records of sites whose physical future may be uncertain.

Yes. Direct Dimensions’ scanning team and equipment are fully mobile, so scanning can take place on-site wherever the object or space is located, from a factory floor to a museum gallery to a historic building. This avoids the risk and cost of transporting large, heavy, or delicate items.

There are no hard size limits and the right approach scales with the object. On the small end, specialized high-resolution scanners can capture objects just a few millimeters across, such as dental components, coins, jewelry or small mechanical parts, though features below roughly 0.2 mm may not resolve clearly with most handheld systems. On the large end, buildings, aircraft, ships and entire facilities can be scanned by combining long-range laser scanners, photogrammetry and other tools. Larger and more complex scans require more equipment, scanning time and processing, which is reflected in project cost.

Yes. This is one of the most common reverse-engineering requests Direct Dimensions receives, especially for legacy military, industrial, and marine/ground vehicle components that predate 3D CAD design. The physical part is scanned, then rebuilt into accurate, manufacturable CAD geometry that can be sent directly to a machine shop or 3D printer.

Yes. Once an object is scanned and converted into a digital model, Direct Dimensions can reproduce it through 3D printing or CNC manufacturing, at the original scale or resized, for restoration, exhibit replicas, or prototyping. A recent example is a National Park Service project that produced a detailed 32-inch replica of the Mission San Cayetano de Calabazas ruins.

Accuracy requirements vary enormously by application. Precision metrology and first-article inspection typically demand ±0.01 to 0.05 mm, while reverse engineering of machined parts generally falls in the ±0.05 to 0.1 mm range. Custom fit fabrication is usually satisfied by ±0.1 to 0.5 mm, and as-built documentation for construction and BIM workflows typically calls for 1 to 5 mm overall accuracy. Heritage documentation and visual applications are more forgiving still. As a practical guide: your scanner’s accuracy should be roughly five to ten times better than your tightest tolerance requirement.

The object being scanned needs to remain still during capture, as most scanners build their model by combining data from multiple passes and movement between those passes causes misalignment and ghosting in the final data. For people, this means holding a comfortable and relaxed pose. For machinery, we typically scan during a scheduled downtime window. Some specialized high-speed scanning systems can capture slow and predictable motion, and photogrammetry setups with burst-mode cameras can freeze fast-moving subjects. We are happy to discuss the specifics of your situation before committing to an approach.

Outdoor scanning is very common and direct sunlight is the primary challenge, since ambient infrared can overwhelm the projected light used by structured light and some laser scanners. Wind can also move vegetation, signage or other elements mid-scan, creating noise in the data. We account for these conditions through scanner selection, scheduling around lighting conditions and post-processing techniques to clean environmental artifacts. Large outdoor subjects including building facades, infrastructure, terrain and vehicles are routinely captured using long-range terrestrial laser scanning, photogrammetry or drone-based lidar.

These are the three surface types that challenge most optical 3D scanners. Reflective surfaces scatter light unpredictably, causing gaps or distortion in the data. Transparent surfaces refract the projected light so the scanner cannot locate the surface, and very dark or matte-black objects absorb so much light that there is little signal to measure. In practice all three can be handled by applying a temporary (and harmless) matte scanning spray, adjusting scanner settings, using polarized filters or selecting a scanner technology better suited to the surface such as blue laser or infrared. We will always tell you upfront if surface preparation is needed.

Scanning the same object or structure at multiple points in time and aligning the resulting datasets lets you measure deformation, wear, corrosion, settlement or any other physical change with high precision, a process often called change detection or deviation analysis. This is used in structural health monitoring, manufacturing process control, mold and tooling wear tracking and construction progress verification. The key is consistent methodology: the same coordinate reference system, the same accuracy targets and documented scan conditions so that comparisons remain meaningful across sessions. We can even develop custom comparison systems for your specific needs.

Direct Dimensions provides 3D scanning and dimensional measurement services across engineering and manufacturing, aerospace and defense/DoD, architecture and construction (AEC), art and museum conservation, entertainment and VFX, and research and development. Clients have included Lockheed Martin, Northrop Grumman, the U.S. Navy and Army, the National Park Service, and major art museums and studios.

Both. In addition to providing full-service, in-house and on-site scanning and modeling services, Direct Dimensions is a Gold Certified Partner and official reseller of Artec 3D scanners, and also sells products and software from FARO, Surphaser, Geomagic, PolyWorks, and custom solutions created by Direct Dimensions.

Direct Dimensions has been pioneering 3D scanning methods and solutions for over 30 years, founded in 1995 at a time when the field itself was just taking shape. We were not simply early adopters but active contributors to developing the workflows, applications and standards that the industry now takes for granted. In three decades we have worked across aerospace, automotive, art, architecture, military, museum, medical and film VFX production, with notable projects including the original 1903 Wright Brothers propeller, the Liberty Bell, the Tomb of the Unknown Soldier, the National Air and Space Museum and much of Times Square in New York City. Major clients have included Lockheed Martin, Northrop Grumman, the US Navy, the National Park Service, Disney/Marvel and the Jeff Koons Studio.

Yes. Direct Dimensions offers certified training courses at its Owings Mills, Maryland facility for the scanning and software products it sells, and trainers can also travel to your location or conduct training virtually. Courses can be tailored to your team’s specific tasks and equipment.

PASS is a fully automated 3D scanning system developed by Direct Dimensions that digitizes small parts in about two minutes with the push of a button, at up to +/- 10-micron precision, without manual repositioning. It’s designed for organizations that need to digitize large collections of parts efficiently, for inventory management, e-commerce, digital catalogs, or research archiving

Yes. Direct Dimensions has more than 30 years of experience supporting defense, military, and government organizations, scanning everything from ships, submarines, and aircraft to individual gear and equipment, particularly for legacy systems that predate digital CAD records.