Reviewing Model Groups

The majority of current projects I’m consulting to are multi-family housing, or patient care.  Both utilize model groups extensively to efficiently duplicate and update the repetitive room/unit layouts across multiple levels.  While good for repetition and update management, groups can be processing intensive for Revit. A few things to keep in mind:

a) Exclusions from groups are VERY processing intensive.  With each regeneration, Revit must individually check each group instance and ‘remove’ exclusions.   If processing triggers a ‘clock time’ violation, excluded groups are often ‘fixed’ by Revit by duplicating the group and adding the dreaded “1” suffix, which means – that group will not update with it’s original group, and you may not notice that until a deadline!

TIP: Keep your groups to the lowest common denominator, and add to, rather than subtract from.

b) Watch for group elements that extend beyond their intended range – such as this multi-story shaft wall (that shouldn’t have been included in the group in the first place) – that once copied up to higher floors, resulted in overlapping walls that had to be excluded from subsequent group instances.

How to avoid / check for these?  Work with 2 views – the plan view and a 3D view.  Select desired elements in plan; ‘temporarily isolate elements’ in 3D to verify the elements selected.  In this case, either remove the multi-story wall from the group (and follow up removing duplicated walls on other levels) or modify the wall to a single level height and reinclude it into the subsequent group instances.

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