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In Dimensioning Mode, the Import Tool loads a .STEP file as the nominal CAD body for your scanned part. The imported CAD is the reference geometry that Profile evaluates the scan against, and is also where you define the CAD-side half of your Datum Reference Frame using the Datum Tool.
This page covers the Dimensioning Mode workflow for nominal CAD import. For the broader Import Tool — including .STL Mesh import in Analysis Mode — see the main Import Tool article.

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Why a separate workflow

Nominal CAD import is the only point in 3D Auto-Dimensioning where data enters Voyager from outside the scanner. The CAD body provides:
  • The exact nominal geometry that Profile compares against your scan.
  • A surface on which you can build a CAD-side Datum Reference Frame that mirrors the DRF defined on the scanned part.
Because STEP carries native units and exact geometry, no scale entry is required at import time — Voyager preserves the units defined in the file.

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Workflow

1

Switch to Dimensioning Mode

Select the Dimensioning tab from the Mode tabs on the left-hand side of Voyager.
2

Open the Import Tool

Select the Import Tool from the Toolbar. In Dimensioning Mode the Import Tool accepts .STEP files.
3

Upload your .STEP file

Choose the STEP file representing the nominal part. The imported body appears in the Data Panel as a new Data Object.
4

Define datums on the imported CAD

Use the Datum Tool to build a DRF on the imported CAD that mirrors the DRF on the scanned part. Matching labels (for example, A, B, C) make datum correlation in Profile trivial.
5

Run Profile

With matching DRFs on both the part and the CAD, run Profile to evaluate deviation.
Export STEP files from your CAD tool with the part isolated as a single body. Multi-body assemblies should be split before upload so Profile evaluates the intended geometry.

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File guidance

A few practical tips for clean STEP imports:
  • Single body per file. If your CAD model contains assemblies or fixtures, export only the part to be evaluated.
  • Native units preserved. STEP files declare their own units; Voyager respects them. There is no scale field to set, unlike the .STL flow in Analysis Mode.
  • Geometry, not tessellation. STEP is exact geometry, so polygon count is not a concern — unlike the .STL flow used by the Compare Tool, where polygon density affects accuracy.