|Unconstrained form||Reference-based form|
|Displays a solid line when highlighted. ||Displays a dashed line when highlighted. |
|Created when there is no need to rely on another form or type of reference.||Created when there is a need for a parametric relationship between the form and other geometry or references.|
Created using any line in the Draw panel. Click Home tabDraw panel Line.
Created using reference lines, reference points, or any part of another form. Click Home tabDraw panel Reference.
|Not dependent on other objects.||Dependent on its references. When its dependent reference changes, the reference-based form changes.|
|Profiles are unlocked by default.||Profiles are locked by default for extrusions and sweeps.|
|The edges, surfaces, and vertices can be edited directly.||Edited by directly editing the reference element. For example, select a reference line and drag it using the 3D controls.|