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Tuesday, February 9, 2010

Revit - Anchor Symbol & Equality Constraints - Tech Tip

Source: http://revitclinic.typepad.com/my_weblog/

One item to keep in mind with multiple equality constraints is the anchor symbol. The anchor symbol can be used in multi-segmented, equality constrained dimensions to determine which element will remain stationary.
The anchor symbol will not appear if one of the referenced objects [ex. reference plane] is pinned.
Center Ref. Plane Pinned Center Ref. Plane Unpinned
It can be important to verify the anchor location if a family does not appear to flex after a dimensional parameter is added. In the example video below [no sound] two versions of the anchor location are displayed. You can see how the anchor location will affect how the E.Q. constraints move in relation to the anchored reference plane:

Video Example
Somewhat related to this issue, if you find you cannot apply a dimensional parameter to a string where it should work, try the process below:

1. You apply a parameter to a dimension, and receive the error “Constraints are not satisfied”.
2. Before adding the parameter to the dimension, change the distance to match the default value for the parameter in Family Types.
3. Then add the parameter to the dimension and verify that it flexes properly.
Video Example

Link: The Revit Clinic


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