General Information
Measurements, independently of their type, have a few things in common.
- You can choose units for measuring various physical quantities in the
Preferences dialog box. For more information, see Table 13.
- You can create several measurements, and save them in a review. markup.
- Measurements are not associative. They are not recomputed if the geometry
changes.
- Measure and
Measure Thickness commands are not available while
reviewing drawings.
- The Measure and Measure
Thickness commands create non-persistent features when a markup
is not created or disabled. These measurements can be removed by selecting the
Remove previous non-persistent measure option. For
more information, see Measure.
These
non-persistent measurements are added to the newly created slide as
persistent measurements. For non-persistent measures, context menu is not available.
- A default measurement type is provided based on the selected objects The
alternative measurement types and representations are available for selection in
the context toolbar during the creation of the measurement. After the measurement is created,
only the representation can be changed.
For more information on measurements
that can be created for various combinations of geometries selected, see
Multiselection for Measurements.
About Measurement Accuracy
The accuracy of a measurement depends on the accuracy of the underlying geometry
(that is, the geometry upon which the measurement is based).
Understanding How Accuracy Works
- 3D Accuracy (Sag)
-
The value used to tessellate geometrical data is known 3D accuracy,
or sag.
3D accuracy influences the quality of the 3D geometry, and may
therefore also influence the accuracy of a measurement.
- Exact Geometry vs. Approximate Geometry
- Exact geometry contains canonical information (line, circle, plane,
cylinder, cone, and sphere), whereas approximate geometry does not
contain any canonical information.
- Measurement Accuracy
-
The accuracy of a measurement depends on the 3D accuracy, or on the
sag, of the underlying geometry.
If the result is exact, the accuracy value is 0.001mm. If the result
is approximate, the accuracy value is twice the sag value.
What You Should Remember
- A measurement is exact only when all selected geometries are exact. If at
least one of the selected geometries is approximate, then the measurement is
approximate.
- Once the measurement is created, you can display the accuracy mode by
selecting the measurement and clicking Display More
 in the context toolbar.
The Specific Case of Measurements Based on Section Curves
When you cut through objects using a section plane, section curves are
displayed. When creating measurements based on section curves, you need to keep a
few things in mind.
- Section curves are considered as approximate geometries. Therefore, measurements
based on section curves are approximate.
- Measurement based on section curves are not associative. If you move the
section plane, section curves are modified, but measurements are not modified
accordingly.
- You can only create measurements on section curves, not on the cut area enclosed
by the section curve.
See Sectioning Items.
Measuring with Dynamic Loading
- While measuring geometries or distance between two features, the geometries
under consideration cannot be unloaded. To do so, you need to delete the measure
feature.
- Only the loaded elements are considered for measurements. The elements loaded in
the session after the measuring process is complete, are not considered.
- While measuring elements, if the selected product is partially loaded,
- the whole product is highlighted in orange.
- the geometries loaded after the selection of the product are displayed
with less opacity.
- the measurement results is displayed in warning style (orange) to
indicate that the geometry is partially loaded.
Once the measure is created, only the warning style is kept.
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