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Datums are reference geometry used to construct Datum Reference Frames (DRFs) — the coordinate systems that anchor GD&T evaluations like Profile. Voyager’s Datum Tool, part of 3D Auto-Dimensioning, lets you define datums on both your scanned part and on imported CAD so the two can be correlated for accurate datum simulation.
All measurements should be performed on an ROI that roughly orients your part to the correct orientation. The datums you define inherit the orientation of the ROI they are built on.
The Datum Tool is available in Dimensioning Mode.

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Supported datum types

Voyager currently supports three datum types:
  • Plane — built from a single extracted plane feature
  • Axis — built from a single extracted cylinder feature
  • Midplane — built from a pair of parallel plane features
More types and richer datum-simulation parameterization will be added over time.

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Defining datums on a scanned part

Datum defined from detected feature set
Datums on the part are built from features produced by Automatic Feature Extraction. To define a datum:
1

Select the Datum Tool

Choose Datum from the Toolbar in Dimensioning Mode.
2

Choose a datum type

Pick Plane, Axis, or Midplane.
3

Pick the source feature(s)

Click the extracted plane (Plane), cylinder (Axis), or pair of parallel planes (Midplane). Eligible features highlight on hover.
4

Label and submit

Assign a label (such as A, B, or C) and submit. The new datum is added to the scene.

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Defining datums on imported CAD

Datum defined on imported STEP file of CAD
Datums can also be defined on uploaded CAD models. Use the Import Tool to bring a .STEP file into your Project — see Nominal CAD Import for the focused walkthrough — then run the same Datum workflow against the CAD body.
For Profile, you must define a corresponding DRF on both the imported CAD and on the scanned part. Matching labels (for example, A, B, C) on each side enable Voyager to correlate the two frames in the Profile workflow’s datum-correlation step.

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Adjusting leaders and labels

Each datum displays a leader and a labeled flag in the Viewport. Use the leader and label controls in the Attributes Panel to adjust orientation and offset. Clean placement makes it easier to read complex DRF setups in Reporting Mode Bookmarks, Renders, and Animations.