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Friday, June 11, 2010

Limits of Selection - The Revit Clinic [Tip]

tSource: http://revitclinic.typepad.com/my_weblog/2010/06/limits-of-selection.html

Another good issue came across my desk the other day that I wanted to share. Some of you might run into this, but my guess would be that you will not.
A customer was working on some rather large projects and was running into a problem with being able to select all the elements in the file. They would go to a 3D view and attempt to window select everything in the model. In this case, they were grouping their curtain walls together and everything else was turned off.
When they would select everything, Revit would only select 16,383 objects in the view. If they selected half the model, they could get another 16,383 objects, and the other half would give them about 12,000. Something wasn't adding up.
Turns out that Revit prevents you from selecting more than 16,383 objects at a time. It was a mechanism implemented to prevent what we call "Runaway" selection and have a negative impact on the software and the model. It was an older "feature" so to speak, before there were Revit files that could get this big.
A obvious solution is that you can select the model in chucks that are smaller than 16,383.
By the way, 16,384 is 2 to the 14th power, (we let you select one less than this number), just some info for any geeks out there.
If you have run into this selection limit, let me know, I'd be interested to hear what you have done.
Limits of Selection - The Revit Clinic

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