TEETHING PROBLEMS – GC to Revit – My response

QUESTION FROM READER: I’ve integrated the GC tool (thanks to the Revit conference contacts!) into an elective class starting early next year and am working with some Masters students using this and Rhino’s Grasshopper tool.
There are still teething problems with the integration back to Revit (or into a BIM workflow is more accurate I guess) and would appreciate and comments on this.

MY RESPONSE:

Hi David

I will just quickly respond to your question – in brief – and say the following:

I am okay with the GC model remaining in DWG format with the Revit model. (I know this is technically not best practice – but I think in this instance the pros out way the cons. I would say in response to your question that I am also okay with GC generating all the required BIM data for the GC part of the model. whilst the Revit model generates the data for all Revit related model.

In that sense I do think that we need to reconsider the purist approach/ ideal that so many have clung to for so long…

The more I get to grips with BIM the more I believe that BIM should not be so much a single model driven solution as much as it should be a database- associated-with-a-collaborative- collection-of-models-solution.  (Ha-ha … A new term for scrabble fans ;-p)

My point being that the ideal of cramming every single bit of information into a single model environment (even per discipline) might – potentially- be too idealistic given the current limitations within software’s from various sources to integrate fully.

I hope this answers your questions in some form.

  • Essentially my approach would be to build a Revit model where appropriate
  • Import a GC model (in DWG) where Revit cannot generate the require form and complexity
  • Generate automatic Fabrication plans (AMEN!!!!!) through GC and import into Revit to keep documentation output set tidy. (This will become an ongoing management task – since the GC will not remain live if changes are made. But I think it can be managed with good ol’ fashioned communication ;-)
  • Schedules for Revit model obviously come from Revit
  • Schedules for GC model from GC- Since the GC form could not be generated in Revit (And if it could you would obviously do it in Revit – unless GC fabrication plans where still a requirement) So in that case import schedules into Revit or even better… export all relevant data into a neutral database environment.

That would be my plan of attack… which I’m sure might ruffle a few feathers – but hey there’s always more than one way to achieve an out come.

I hope that was helpful and has answered your question for the most part.

I would just say that I would not waste hours of my life converting a GC model into Revit massing (Apply by face) unless it was really-really worth while. And I can’t imagine when it would be…mmmm… Sure it means you will need to dimension the GC model every time you re-load but my response to that would be – dimension the GC model in detail only when it’s resolved!

GC is a very specific software that should be used to generative a unique range of forms that currently Revit and other 3d modeling software’s currently cannot.  Sure – there is some time lost in rework of dimensions… but hey – I wouldn’t be game to try model some of the GC forms in Revit. Apart from the fact that you must remember that the BUZZ about GC is it’s ASSOCIATIVE, LIVE and can generate new forms based on new formulas or constraints. Use it’s strengths and adapt your BIM solution accordingly. That would be my approach.

I’d be happy to approve your comments and findings if you wish to share them on this blog in future. Mm… I did say it was going to be a short response – I cant seem to help myself sometimes!!! Have fun.

Cheers for now

Michelle.

 

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