1. Inspect a visual overlay
An overlay is a useful first review. Display both models in the same coordinate frame and inspect obvious additions, removals or movement. Check whether the viewer has aligned the models automatically. An overlay can conceal a small change behind a surface, so a visual match should not be recorded as proof of equality.
2. Compare aggregate properties
Volume, area, centre of gravity and bounds can identify a large transfer problem quickly. They are useful screening signals. Different shapes can share the same aggregate values, however, so matching numbers cannot close a detailed revision review.
3. Review a sampled distance map
A distance view helps locate differences and communicate their scale. Record the units, colour range, alignment and sample scope. A maximum observed value belongs to the sampled points; it is not automatically a certified bound over every surface. Zoom into the changed region before preparing the inspection handoff.
4. Review added and removed regions
A Boolean difference can help describe material additions and removals when the input geometry satisfies the method’s prerequisites. Record any failed prerequisite. Do not turn an unavailable Boolean result into a zero-change finding or discard other completed observations.
5. Compare the product information
Review assembly structure and supported semantic PMI alongside geometry. A changed tolerance can matter even if the nominal shape is unchanged. Conversely, a geometry edit can affect a characteristic whose displayed value has not changed.
Choose a combined review
Start with exact input identities and a known baseline. Use the methods that answer the engineering question, then document the gaps. PartDatum Compare presents supported observations and preserves unresolved scope; the quality team decides whether the evidence is sufficient for the intended use.