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Forums >> Revit Structure >> Technical Support >> moving a model group affects all instances?

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Mon, Jul 17, 2017 at 9:55:52 AM | moving a model group affects all instances?

#1

Daggie


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When I am moving or changing location of a model group (on the same level), it is very slow and i noticed it is : Extending changes to group "x"  to all instances.

why does it need to change to all of them if i only changed the location?

is this why it is taking so long for every simple change?



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Mon, Jul 17, 2017 at 12:21:55 PM | moving a model group affects all instances?

#2

Beaucoupnice


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Revit's not so great with groups, especially if they contain a lot of objects and a mixture of 3D & 2D content.

To plagiarise an article I previously wrote on LinkedIn (see link below for reference as it does have quite a few good tips)Grouping multiple 3D objects that vary in category and geometry creates complex 3D relationships e.g. grouping building floors in multi-level developments. Larger groups require more processing time and have an increased risk of errors during changes. When the time to process group changes starts taking too long it is time to break that group into smaller groups.When large complex groups are mirrored, Revit can struggle to maintain group associations. This leads to processing lags and errors. Avoid mirroring complex groups and instead just create new groups from the mirrored designs.Don’t have lines in your groups, only have families. Lines increase your model size with each copy.If you have already created the group and need to place multiple instances of it, place the group from your project browser, don’t copy and paste them from other views.https://www.linkedin.com/pulse/rapidfire-revit-ii-hard-words-morrow-brady


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Mon, Jul 17, 2017 at 3:16:37 PM | moving a model group affects all instances?

#3

WWHub


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Revit groups do work but it takes awhile to understand how they work and their limitations.

In your case, you really don't tell us anything about your group and how it is placed. As Beau has noted, mirrored or rotated groups can have problems but you are talking about affecting other placed groups.  That would not be a typical problem unless you are actually editing this group ...whatever it is.


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