The long overdue third instalment of my ‘The role of PDFs in BIM’ trilogy
Let
me start with a long-winded explanation on, how this post is not supposed to be
an argument based on the question of ‘why would one want to import one (or
hundreds) of PDF file(s) into any working BIM model?’.
There
are two reasons for me wanting to avoid this argument, one being that, those in
the know will fall neatly on either side of the argument, strongly believing
that to be totally unnecessary or an essential capability of the BIM toolset
they use. And no amount of questioning their stance will likely to move them
from it.
The
second reason is that, I do have a lot of dear friends and colleagues that are
avid Revit users who will feel somewhat personally attacked by the notion that
this question could be the absolute key issue of almost anything BIM –
considering their beloved toolset’s inability to deal with it. There is little
point in undermining those personal relationships of mine and to reinforce my
goodwill and intentions it I’ll admit to the Great Truth of BIM, again, and
again –
‘Autodesk
rules the BIM world. Revit is the King of BIM!’.
Now,
can I get on with exploring PDFs in BIM models?
Through
my work I build BIM models from other people’s designs, either during the
official design process, following it as part of preparing construction tenders,
parallel to building the real thing or even post construction for settling
residual claims between parties.
I
am a hands-on modeller and my speed, accuracy and ability to deduct useful
information based on the model is highly reliant on how I can make use of the
hundreds and thousands of PDF documents that are available for the
stage/project I am working on.
These
PDF’s, needless to say are always prepared by others and never with the view to
make my life easier, so even before they get into the model, they must be
scrutinised, analysed, weeded-out and ordered.
Once
that is done I usually end up with still a large number of files wanted to be
imported and while it is a tedious process, I like it as it helps me get to
know the project.
ArchiCAD
is my tool of choice and I really enjoy how it handles PDF’s within its BIM
models.
Here
are 10 of the features I can list from the top of my head:
(yes
I know…why would you want to bring in a PDF, when a DWG will do and it slows
down the file and makes it unusable and…. – let’s just for a minute accept, I
LIKE bringing PDF’s in my models and just for a minute, let’s savour these little clever tools);
1.
ArchiCAD imports PDF’s as Drawings (as opposed to images)
2.
While importing one can choose on the fly any page from a hundred (thousand)
page document.
3.
Once imported the file can be resized, or shaped any way one likes (i.e.
creating nods and curving edges and offsetting and whatnot)
4.
Literally hundreds of sheets can be imported and kept linked up with no noticeable
impact on file-speed and/or agility.
5.
ArchiCAD allows one to use the Trace&Reference with PDF’s the same
way as with any other drawing element.
6.
One can ghost a plan behind a section (real or PDF-ed) or a detail in-front
a relevant section.
7.
One can use colours on the PDF’s
8.
And/or make them transparent (at varying degrees);
9.
One can slide between the ghosted views and the views can be moved
within references without physically relocating.
10.
The files stay linked and it is very easy to update even when moving
between various media (like memory sticks).
I
am sure there are other neat little features that ArchiCAD has for dealing with
PDFs that I am missing here, but I really wanted to concentrate on the ones
that I use daily.
I
sometimes question myself, if I HAD to work on a BIM model and not have these
features available would I get by?
I
sure would – but man, would I hate it too.
I
guess also that I would only hate it
because I have had the experience to model ‘with the features available at hand’
– otherwise, one does not miss what one does not know.
So,
to sum it up – this post is to state, that like it or not, PDFs are and will be
for a long time part and parcel of any BIM related activity (trust me, I work
in the real AEC).
And
sure, Revit is still the King.