Autodesk 256B1-05A761-1301 - AutoCAD Revit Structure Suite 2010, User Manual

Page: 596 / 1638

Unconstrained and Referenced-Based Forms
Depending on the tools used to create them, 2 types of form are created in the conceptual design environment.
■ unconstrained form
■ reference-based form
The behavior of these 2 forms may differ when they are modified.
Reference-based form Unconstrained form
Displays a dashed line when highlighted. Displays a solid line when highlighted.
Created when there is a need for a paramet-
ric relationship between the form and
other geometry or references. Created when there is no need to rely on
another form or type of reference.
Created using reference lines, reference
points, or any part of another form. Click
Create Tab
➤
Draw panel
➤
Reference.
Created using any line in the Draw panel.
Click Create tab
➤
Draw panel
➤
Line.
Dependent on its references. When its de-
pendent reference changes, the reference-
based form changes. Not dependent on other objects.
Profiles are locked by default for extrusions
and sweeps. Profiles are unlocked by default.
Edited by directly editing the reference
element. For example, select a reference
line and drag it using the 3D controls. The edges, surfaces, and vertices can be
edited directly.
Related topic
■ Form Types on page 556
Converting Reference-based Forms to Unconstrained Forms
1 Select the reference lines on a reference-based form.
2 Click Modify Reference Lines tab
➤
Element panel
➤
Element Properties drop-down
➤
Instance
Properties.
3 Clear Is Reference Line.
The form is unconstrained.
554 | Chapter 11 Conceptual Design Environment