What Is 3D Laser Scanning?

The Creaform HandyScan Black Elite uses active stereo vision with structured light triangulation. It projects a pattern of laser crosses onto the surface and uses two calibrated cameras to observe how that pattern deforms. By measuring the angular difference between the projected pattern and its observed deformation, the scanner calculates the precise 3D position of each point via trigonometric triangulation.

This is fundamentally different from time-of-flight measurement (used in LiDAR), which measures the round-trip time of a laser pulse. Triangulation is slower per-pulse but far more accurate at short range — which is why it's the right technology for mechanical parts where you need ±0.025mm, not the ±10mm typical of LiDAR.

The scanner emits 7 laser crosses simultaneously, capturing 1.8 million points per second. It operates at Class 2 laser power — eye safe at normal operating distances. No scanning spray or surface preparation is required for most materials. Highly reflective or transparent surfaces (chrome, glass) may require a light coating of developer spray.

Each scan frame is registered to the previous frame using retroreflective targets (small adhesive dots placed on the part or surrounding surface) and/or feature-based registration for parts with sufficient geometric complexity. The result is a continuous, registered point cloud that covers the entire visible surface of the object.

Volumetric accuracy describes the worst-case deviation between a measured point and its true position anywhere in the scanner's measurement volume. The HandyScan Black Elite's volumetric accuracy is ±0.025mm — meaning any single measurement point is guaranteed to be within 0.025mm of its true 3D position, regardless of where the scanner is positioned relative to the part.

This is distinct from resolution (the minimum spacing between captured points) and repeatability (how consistently the scanner produces the same result across repeated scans). All three matter for different applications:

• Accuracy matters for first article inspection and GD&T verification against a nominal CAD model
• Resolution matters for capturing fine surface detail — threads, radii, sharp edges
• Repeatability matters for production inspection where the same part is measured repeatedly

For comparison: a standard caliper has accuracy of ±0.02mm but measures only one point at a time. The HandyScan captures 1.8 million points per second at ±0.025mm — providing complete surface coverage rather than spot measurements.

The scanner is NIST-traceable, meaning its calibration is traceable to national measurement standards maintained by the National Institute of Standards and Technology. This is a requirement for aerospace, defense, and regulated manufacturing inspection work.

A polygon mesh represents geometry as a collection of vertices, edges, and faces — typically triangles in scan-derived meshes. The quality of a mesh is described by several parameters:

• Triangle count: Higher triangle counts preserve fine detail but produce larger files. A typical mechanical part mesh ranges from 500,000 to 5 million triangles. Schimmel Engineering delivers both full-resolution and 80%-decimated meshes as standard — the decimated version is easier to handle in downstream software.
• Watertight (manifold) mesh: A mesh with no holes, non-manifold edges, or self-intersections. Required for 3D printing, FEA analysis, and CAD import. Most raw scan meshes require post-processing to become watertight — filling scan shadows, smoothing noise, and repairing artifacts.
• Raw mesh: The unprocessed triangulation of the point cloud. Useful for inspection workflows where you want to preserve every measured point, including surface texture and noise.

Mesh files are delivered in STL (stereolithography — universal, no color) and OBJ (Wavefront — supports color/texture maps) formats. Both are compatible with all major CAD, slicing, and inspection software.

Importantly: a mesh is not parametric. It describes shape as a triangulated shell — not as engineering features. You cannot directly dimension a mesh, apply tolerances, or modify features the way you can with a parametric CAD model. The mesh is the starting point for parametric reconstruction, not the end point for manufacturing.

Parametric modeling from scan data follows a structured workflow that Schimmel Engineering performs in SolidWorks 2026 Professional with reference to the processed mesh:

• Datum extraction: Identify primary, secondary, and tertiary datum planes from the scan geometry. These become the coordinate system for the model and the reference for all GD&T callouts.
• Feature identification: Interpret what each region of the mesh represents as a machining or fabrication operation. A cylindrical region is a turned bore or boss — not just a curved surface.
• Nominal geometry reconstruction: Fit idealized geometry to the scan data. A bore that measures 24.97mm after years of wear is modeled as 25.00mm — the design intent — unless the application requires an as-built nominal.
• Tolerance application: Assign GD&T callouts based on functional requirements, mating interface criticality, and manufacturing process capabilities. This is engineering judgment that the scan itself cannot provide.
• Validation: Import the completed model back into inspection software and compare against the original mesh. Deviation mapping confirms the model accurately represents the scanned part within specified tolerance bands.

The output is a fully history-based SolidWorks part file (.SLDPRT) with a complete feature tree — every extrude, revolve, and fillet is editable. Neutral formats (STEP AP214, IGES) are also exported for use in other CAD platforms.

A CAD model tells a machinist the shape. A manufacturing drawing tells them the requirements — which dimensions are critical, what tolerances apply, what surface finish is required, and what material to use. Most domestic CNC shops can work from a STEP file alone for simple parts. For anything with:

• Critical fit interfaces (shaft/bore, press fits, clearance fits)
• GD&T requirements (flatness, perpendicularity, true position)
• Surface finish specifications (Ra values, post-processing requirements)
• Overseas manufacturing (drawings prevent ambiguity across language barriers)
• Legal or regulatory documentation requirements

...a fully dimensioned manufacturing drawing is required. Schimmel Engineering produces drawing packages in SolidWorks Drawing format exported to PDF and DXF/DWG, formatted for both domestic and international vendors. Drawing packages typically add $500–$1,000 over the base CAD model fee depending on part complexity and number of sheets.

STEP AP203 transfers solid geometry and topology — the shape and how surfaces connect. It does not transfer color, material, or assembly structure metadata. Supported by all major CAD platforms since the mid-1990s.

STEP AP214 is a superset of AP203 that adds color, layer information, and limited metadata. Use AP214 when transferring assemblies with visual organization or when the recipient's CAD platform supports it. This is the format Schimmel Engineering exports by default.

IGES (Initial Graphics Exchange Specification) predates STEP and has known limitations: it transfers surfaces rather than solids, can produce open shells that need repair in the receiving software, and has less consistent implementation across CAD platforms. Use only when the receiving system doesn't support STEP.

For overseas manufacturing vendors — particularly in China and Southeast Asia — STEP + PDF drawing is the most reliable combination. STEP eliminates unit confusion (millimeters are encoded in the file), and the PDF drawing provides the tolerance and finish information that a STEP file alone cannot convey.