Monday, June 30, 2008

Removing Invisible Constraints

We had a situation at office: An user tried to move a wall and Revit moved two other walls along with it. We searched for any constraints or locks. None. Even if the constraining dimension is deleted, Revit shows a lock when the constrained elements are selected. We searched for the missing constraints using the technics here. To no avail.

Updated 20080724: There is a "Constrains" object in the Annotation category in the VG dialog box. May be constrains were switched off in that such a case, it is easy to switch it on > select and unconstrain.

The project is quite complicated with phases, worksets, design options, etc. We just wanted to get rid of the constraint. To select and delete the invisible constraint:

  1. Selected the wall and moved it with the Disjoin option.
  2. Revit gave an error saying some objects will be deleted.
  3. The constraining dim was the first one in the list. We could not check the box and delete it and we could not delete the other objects (like wall tags, etc.) along with them. So we noted the object id and canceled out of the command.
  4. We did: Tools menu > Elements ids > Select by id and selected the constraint and deleted it.


Amit Uppal said...

Hello, A strange thing happening, I unlock both constrained Locks of a Level. But after Unlocking, when I click again on that Level then the Locks appear as Locked again. How this can happened, I m using RAC 2008.

Nicholas said...

I cant say much without looking at your project. You could switch on the 'constraints' element in the Annotation tab in the VG dialog box to see if the levels are infact constrained and then right click on the constraint to remove them.
You can also dimension the levels to see if a locked dim shows up.
The end points of levels are typically constrained with the end points (extents) of other levels which is different that what is discussed in this blog.