With Autodesk holding a 63% (NBS National BIM Survey) share of the CAD drawing market what affect will this have on open BIM for the future? What does open BIM actually mean and what are these COBie files that we keep hearing about? With these points in mind this week’s article will focus on open and closed BIM and the interoperability of BIM software as well as asking one or two questions about what all this means for the future of an open BIM collaborative working environment.
Closed BIM generally refers to when BIM
processes are carried out on a single platform whereas open BIM refers to when
the BIM environment crosses multiple platforms regardless of the software
vendor, in essence an ‘open’ shareable design environment using open standard
data.
To achieve an open BIM project environment information
needs to be shared/exported to a non-proprietary format, such as IFC’s. Currently
there are strong opinions and voices behind the drive towards open BIM with the
Government specifying in the BIS-BIM-strategy-Reports that Maturity Level 4
BIM should achieve “Fully open process and data integration enabled by IFC/IFD.” Many individual BIM experts are also pushing for the drive towards an
open standard BIM future.
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| Sourced from - BIS-BIM-strategy-Report (2011) |
To briefly explain what IFC data formats are,
they are in essence an 'open' and neutral data format which set a data standard
which if utilised can assist in the 'interoperability' between software
packages. As stated by BuildingSMART “Industry Foundation
Classes (IFC) are the open and neutral data format for openBIM.” The data standard which has
been developed by Building SMART international, if adhered to enables for the
exchange of models and information between multiple software types, in essence
achieving interoperability.
Interoperability
is a significant word which if involved in BIM already you will be more than
familiar with, if not it’s something that you will begin to understand the
significance as you progress further into the world of BIM. For files and
models to be shared and merged amongst multiple analysis tools and offices they
need to be ‘interoperable’. If software packages have the ability to be
interoperable then it means that time can be saved through not having to
continually redevelop new building geometry for each tool that you wish to
utilise to carry out your various analysis.
The importance of this interoperability of files and models across all
the teams involved within a BIM project is a pressing concern within BIM which
is continually being intensely developed.
Interoperability is a key factor that needs to be drummed home when
considering BIM and is seen as being a key component in the future success of
BIM projects and needs to be carefully considered at every step.
If the work produced by varying teams is
carried out and outputted in an interoperable manner then it allows for
multiple teams to work collaboratively on a project without necessarily holding
the same software skills and licences. When reading and encountering BIM these
are key words that you will soon become familiar with; interoperability,
collaborative working, shareable data, data integration, IFC’s, data sharing
protocols to name a few….all of these words and terms hope to lead the
construction industry to one place, a ‘fully open process’ and working
environment.
COBie is another tool that is also vastly
becoming synonymous with BIM. COBie is a tool which
allows for a multitude of non-graphical data and information to be stored in an
organised manner, in essence a spreadsheet. All of this data can then be handed
over to the client/facilities management department allowing for easy access to
a multitude of details post-completion without having the unenviable task of
sifting through a mass of fragmented documentation looking for specific details
such as the manufacturer’s contact details of a door handle! With COBie the
intention is that all of this information can be kept in an up-datable database
which can be easily accessed and kept up to date throughout the whole life
cycle of a building, from concept through to demolition. Interesting further
reading on COBie can be found at NBS by Stephen Hamil.
 |
| Sourced from http://www.bimtaskgroup.org/cobie-uk-2012/ |
It
is argued that this topic of interoperability of file formats and software
packages will be a major factor in determining BIM's success and whether it’s a
smooth transition from isolated design practices to a truly collaborative BIM
environment. Software programmes
such as REVIT can sometimes be referred to as closed BIM, but I feel this is
not a clear defined point as REVIT does have the capability to export file
types in the ‘open’ BIM IFC format which allows for interoperability between
designs and models. For instance REVIT can export all of the information and
modal data from REVIT in the IFC data format which can then be imported into
various other software packages, beyond the Autodesk circle of software. So with this in mind you have to be careful
when considering what is truly open BIM and what is closed BIM as the
boundaries are not always clear.
The
voices behind 'open' BIM are actively encouraging BIM practitioners to utilise
the IFC data formats and open BIM standards, with part of the hope that no one
software vendor will have a monopoly on the market. According to the recent NBS NationalBIM Survey 2013, within the scope of their research pool Autodesk
currently hold a 63% share of the CAD drawing market so clearly they have a
large proportional share of the market. What will be interesting over the years
to come will be to see how this large market share affects the progression and
evolution of BIM in the coming years. Will Autodesk’s share open up or close
down the interoperability of BIM? Are Autodesk going to be happy to push
forward with open BIM or is it in their interest to actually tie practitioners
into their product package? This is something that will be interesting to see
how it pans out and how far down the open BIM road BIM can progress with
Autodesk and the other software contenders a clear defining factor in how
‘open’ BIM becomes.
To
collaborate efficiently with a goal at reducing cost, time and carbon central
to the ethos of BIM then in my opinion surely we need to push forward with an
open approach to BIM sharing standards. I feel that with the research being
continually progressed by the likes of BuildingSMART, NBS and the OPEN BIM Network as well as many others a collaborative open BIM future is possible and with the likes of the
big guns within the software industry supposedly on board than surely it’s just
a case of how do we get there rather than should we head in that direction?
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Do you feel an open BIM future is or should be the only way forward for BIM or do you think one software vendor will end up ruling the roost and lock down the market? Please feel free to add to the discussion further.
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