Could SketchUp be transformed to a BIM or PEN System?

hank

I also think this is a great direction to push SU. I am an architect with some marginal IT and programming experience who loves SU. The beauty of working in Sketchup is the ease with which objects can be created. It is not unlike actual sketching in that, with a few simple strokes, you can evaluate and critique your design. The problem from a production standpoint is that Sketchup is a dead-end. Once you've got the design just right and the client has seen and approved the various views of the model, then you get to start all over from scratch with a traditional 2D drafting program or BIM modeler. The best you can hope for is that you can export a few section slices or a dumb 3D model as the startpoint. Either way, all your Sketchup proficiency and modeling gymnastics only got you to the beginning. What's worse, the disconnect between documenting a design and displaying it means that any refinements made during documentation aren't reflected in the original Sketchup model. Thus, subsequent changes requiring a client presentation will probably send you back to an out-of-date Sketchup model.

Essentially, SU is missing the documentation aspect of traditional drafting software. You can create models easily, but you can't document them: annotating, dimensioning (well), tagging, etc. A preliminary step would be to focus on what each program does well: SU is great at 3D object creation, AutoCAD or other 2d drafting programs are great at noting up 2d representations. Bridge these two functions with script that automates the export of 2D model representations using view planes: define a series view planes, each with a direction they are "looking", and the tool would automate the export of each view plane's 2D representation to a file or series of files. The resulting file(s) would then be linked into the drafting program for dimensioning and annotation. Updated views could be dumped out of SU periodically as design progresses.

Also, this strategy would allow you to manage file sizes in a way that does not over-tax either program. A wall section view plane in SU would be a cut through anomalous masses with certain thicknesses. When the 2D representation gets to the drafting program, details like insulation, studs, and anchor bolts could be added over the top of the section profile. This is essentially how Revit works in my experience anyway. Rather than drawing every stud in 3D, you draw them over the top of the section cut.

Eventually, it would be great to link this tool to tabs within SU and do the dimensioning and annotating in SU or Layout, but at least in the meantime this would give people a way to use their beloved SU models rather than having to ditch them when it comes to Construction Documents.

To pick up on one of Chris's earlier posts, I too think the old "Word Processor" template needs to be chucked. Revit and the other big guys have taken BIM in the wrong direction in creating a Family and Category based system of components that assumes every object needs to know what it is and should be governed by the rules of the category to which they belong. Why can't a wall be Sphere-shaped or a window be paraboloid? Why should the categories of model objects be fixed to some AutoDesk programmer's interpretation of what categories go into a building? If categories must be used, let people model whatever they want and ASSIGN objects to categories and CREATE their own categories instead. The same goes for embedded data and schedules. Try to get Revit to schedule Doors and Curtain Wall Doors and its a hack job - don't forget to exclude all the non-door curtain wall panels!!! Dynamic Components in SU allow users to control what kind of data is embedded in an object completely and does not limit the kind of data extraction routines that can be drawn up.

In my opinion, BIM as we currently see it is headed for the same train wreck of proprietary hacks and endless reverse incompatible new releases and patches. With the current level of modeling inflexibility, users will continue to complain that they can't make the program do X and software companies will continue to hack the programs to allow them to do so. Hack piled upon Hack and you get Architectural Desktop all over again.

Anyway, this is probably the wrong place to discuss the intricacies of how this could proceed. What about a SU-BIM Google group? I will make my marginal programming knowledge available for what its worth.

plot-paris

spot on, Hank! thats exactly the problem of current CAD/BIM solutions. they force their rules of organisation on you with all means. the spherical wall is a great image - just not possible with CAD programms.

I think there are three core things that have to be changed with SketchUp:

it has to become a solid modeller; or more precicely a 'semi-solid modeller'. let me explain: you start out with a SketchUp drawing as you always did - by drawing lines on a flat plane and thereby creating surfaces. but if you now take the push/pull tool to extrude a face, instead of creating five additional faces around an empty space, SketchUp generates a solid cube. later you can define 'what' elements are. so if you tell the cube (or a whole group of solids) to be a wall, it will behave like that. so if you cut a section through it, the texture of the cut wall will have a typical wall pattern - or even a series of layers, thats up to you.
SketchUp has to become a Nurbs Modeller (or T-Spline). Why? Well, a circle needs to be a circle and not only a bunch of lines roughly assembled in the shape of a circle. Such a degree of precision is expected of a CAD program. and it would make creating organic shapes with SketchUp a lot easier (and get the file size down considerably).
well, the third is what Hank said: A thorough documentation! ideally with a high level of automation. after creating an element that is supposed to be a wall, simply tell it to be a wall (i.e. dynamic components). tell each window and door component to be such. if you now cut a secion through the building you only have to hit the auto-dimenstioning tool and because SketchUp knows what is a wall, a window or a piece of furniture, it can do all the work for you!

such a SketchUp is one of my greatest dreams, almost as important as world peace
(men learned to control fire, they designed the wheel - and they created the new SketchUp!)

linea

I would add to that that that you need to be able to draw walls and insert windows, doors etc in a 2d plan view. Much as I embrace 3d, if I'm drawing a large building in SU, it drives me mad that you cannot easily do this. I have created components with 2d and 3d layers so that I can position them in a plan view, but I spent all day yesterday cutting holes for windows.

thomthom

@linea said:

... but I spent all day yesterday cutting holes for windows.

I got a plugin in the workings, which enables a cut-out component to cut through two faces. That should make things easier in terms on placing objects inside "thick walls".

wbarch

Hank: Great comments, I too dread the "architectural desktop" business model that requires multiple gymnastics and loaded scripts to complete a project (going through that right now on a Revit project that requires endless tweaking of the families). I think your comments about auto-generated views for documentation and annotation is actually close to becoming a reality. If you haven't yet, check out IMSI's DoubleCAD, they are attempting to build a bridge between sketchup and 2-D documentation that allows continued changes to SU model to reflect/update in the construction documents (would work similar to your Revit analogy re: detail drawings).

linea: have you used Didier's cutting component ruby? This has worked well for me, allows you to define a cutting plane for each door or window component by points, and then just right-click to cut a wall. You can also specify offset distance for the door or window in a wall.

For everyone who hasn't yet, check out InsiteBuilders web site and blog (Dennis Fukai). Dennis' work with SU as a construction modeler is great. I think he's got a good method for organizing the building elements in a flexible BIM/PEN fashion that gets away from the rigid Revit family/category model.

Now all we have to do is figure out how to adopt these (or create similar) methods, and put everything together.... (I know, easier said than done.....but we're close in my opinion).

-WB

linea

Hi, thanks, I've seen that script but didn't understand what it did, I'll try that.

jim smith

@wbarch said:

. If you haven't yet, check out IMSI's DoubleCAD, they are attempting to build a bridge between sketchup and 2-D documentation that allows continued changes to SU model to reflect/update in the construction documents (would work similar to your Revit analogy re: detail drawings).
-WB

I just read the Doublecad newsletter update today and it seems like once again effort outside Google are making the main SU wish list items happen. It appears, unless I am mistaken, that the SU interactive feature only works in the pro version, which is not a bad price for a full function Acad clone. I have a copy of the free version and it is good to work with and seems to work and play well with Acad. Has anyone had a chance yet to try Doublecad with SU as Mr. Manning has described below?

"SketchUp users can benefit
from advanced workflow
By William Manning, IDX Renditioner Senior Director

Test DoubleCAD XT Pro and try this... If you are a SketchUp user, consider opening the .SKP to automatically generate viewports in paperspace with all the correct layer visibility from SketchUp. Then replace the geometry in model space with an Xref of the original .SKP model. Changes you make when you continue to edit in SketchUp will be reflected even in your paperspace views the next time you open the DoubleCAD .2CD file or update the reference in the block palette.

To take it a step further, if you then use the Drafting Palette on the Xref in model space, even your sections and fragmented views will be associative to the SketchUp model."

errror404

sing me up for it!

Mike Lucey

Here is the link to DoubleCAD, http://www.doublecad.com/

and this video showing how it works with SketchUp, http://downloads.imsidesign.com/Flash/DoubleCADFlash/Import-From-Sketchup-800-600/Import-From-Sketchup-800-600.htm

Mike

wmanning

Not much of a video really...

Now that the AIA Expo is over, and we release our v1.1 this week, I'll see what I can do to show more. We do a pretty good job with SketchUp, but know that there are huge opportunities to improve. So we'd love input from this group.

Thanks,
William

chrisglasier

@hank said:

I also think this is a great direction to push SU. I am an architect with some marginal IT and programming experience who loves SU. The beauty of working in Sketchup is the ease with which objects can be created. It is not unlike actual sketching in that, with a few simple strokes, you can evaluate and critique your design.

I have been looking at Sketchup as an image provider to support all aspects of building - images to support the "select this; put it here" core of both design and construction. Here is a snapshot of the way I start space planning, which I think is similar to "not unlike actual sketching":

Fixed dimensions: site & products -- Not the start; how it ended up.

@hank said:

... the problem from a production standpoint is that Sketchup is a dead-end.

I am sure it need not be; please have a look here to see my start on outputing design and construction sketches. These would provide support to simple text and links to comprehensively pursue both processes.

A problem is setting each scene. Whilst style, outliner, layer and all the other dialogs seem to me to give all the right opportunities, the numbers of windows makes life very awkward (impossible if you want to use handheld controls (that would be pretty modern!)).

So I am thinking of modifying the nameset interface to deal with this as well as the selection and positioning of components, a cocktail of the good!

This might just allow those interested to extract the information they need in the format they want on the machine of their choice, rather than designers deciding what they want to reveal with which software.

@hank said:

Anyway, this is probably the wrong place to discuss the intricacies of how this could proceed. What about a SU-BIM Google group? I will make my marginal programming knowledge available for what its worth.

How it taste?

Chris

chrisglasier

Now I have made a model in Sketchup (here) with sets of nested components and groups, layers, styles, camera positions, section planes and cuts, shadow settings, scenes and so on, I feel much more confident we could come up with a better solution to help the production of scenes for more universally useful displays and/or images. This will rival the complicated CW systems Mike Lucey mentioned earlier in this thread.

I say "we" because the task involves expertise that would take me many more months to figure out. Let me outline a performance specification to see whether I can lure some collaboration for a community project.

It is not the content of menus and dialog boxes that concern me but how they clutter the screen and how they inhibit non modelers from seeing what they want to see. My solution was to use animation so that menus and dialog box items are displayed alternately in a single minimalist control panel. Hence I came up with namesets which simply lays down the items in energised html cells in associative index format.

May namePanel.jpg

A nameset itself is actually an outliner for components, but it is extended with collections and groupings. Collections are components that naturally belong together physically whereas groupings are for components that come from the same source or relate to regulations and such similar subjects. An important aspect is that such collections and groupings are determined within a javascript array, thus avoiding complications of using groups* and nested components for such purposes - no "open, edit and close" operations are required here.

So far I designed a nameset to pick up ready made components from an external source for positioning within a model. This nameset is assembled by adding collection, grouping and finally component names from lists of suggestions - defining hierarchical trails from the big idea to its smallest parts. As the process proceeds, the index value of entities is also added to a javascript display array allowing navigation from the nameset or directly in the SU display.

I am now looking to extract the components used in models such as mine and find a way to define collections and groupings to get back to the singular big idea of the project. Of course, much of this is in the layers I named, and maybe these should be offered as suggestions since some grouping often has little to do with the actual modeling process.

Whichever way round, a nameset in this context offers a means to navigate a project, providing automation to zoom and pan (but not orbit I think), and one means to determine what layers are on and off and which components are hidden or not.

May displayDevice.jpg

The main aspect of namesets I have neglected until now is display configurations offered by camera, styles, layers, scene manager, shadows and so forth (some I suspect still unknown to me). It seems that this too should take on the nameset automated index type format instead of individual devices so that you can easily work different combinations.

A principle concern is whether all this can be achieved using a web dialog with ruby callbacks for all required Sketchup commands; so perhaps this is the first question to pursue, assuming there is interest in this answer to Mike's topical question.

My regards

Chris

changed from layers 27 May

utiler

@hank said:

Anyway, this is probably the wrong place to discuss the intricacies of how this could proceed. What about a SU-BIM Google group? I will make my marginal programming knowledge available for what its worth.

Gee Hank, that's the most interesting 'first post' I have ever seen here!!!!

I too vote a SU-BIM [or PEN] discussion group. Although I couldn't add much value in the way of technical programming, I would certainly be an avid contributor from UI functionality right through to documentation communication....

Bring it on!!!

fionmacool

@utiler said:

@hank said:

Anyway, this is probably the wrong place to discuss the intricacies of how this could proceed. What about a SU-BIM Google group? I will make my marginal programming knowledge available for what its worth.

Bring it on!!!

I'm all ears and willing to pitch in. I checked out Hank's plugin and it seems to work very well. I'm trying to figure out the logic and how it can help my workflow. It hasn't clicked with me yet but its a very nice programming job.

I would love to see it when SketchUp is able to take on the tasks of 1. Outputting quantities and schedules, room sizes etc. 2. Automatically updated references in LayOut for Sections and Details. The kind of stuff that Revit is able to do. Anyone know who is doing interesting work in that area?

utiler

@fionmacool said:

I really like the 1001bit tools also: http://www.1001bit.com (I think it was mentioned earlier)

1001bit tools are great, Paul. I agree!!! I am helping Goh with some enhancements at the moment but time is an issue.....

Dan Rathbun

How to BIMify SketchUp: Collaborative editing works for building programming, too!
A blog by Alex Schreyer (posted September 30th, 2008,) with links, and replies with other links.

301 Moved Permanently

(www.alexschreyer.net)

Dan Rathbun

IFC2SKP plugin
http://www.ohyeahcad.com/ifc2skp/index.php

Question? Is there an SKP2IFC ?

Update: I checked their forum at: http://ifc2skpforum.websitetoolbox.com/
and they mention almost 2 years ago that the SKP exporter would be out 'in a few months'; the world is still waiting...

fionmacool

@dan rathbun said:

IFC2SKP plugin
http://www.ohyeahcad.com/ifc2skp/index.php

Question? Is there an SKP2IFC ?

Thanks for that Dan. Yes, a system that works the other way around would be much much more relevant. Going from Revit to SketchUp is putting the cart before the horse (as far as I can see). If this ever becomes available I would love to hear about it.

Dan Rathbun

.
Interesting post over at Google Groups:

"A plugin for 5D construction animation in Sketchup"

rickgraham

I'd like to point out that while all of your comments are PART of what BIM is, it is not complete.

BIM is taking parts and putting them together to make a finished product. BIM is able to categorize how many lineal feet of blueboard you need. BIM is making a change in the process (like changing a window), and it will autoreplicate through the entire project including the bill of materials or estimating form, thus giving you a revised cost of the project. For Civil folks, BIM is knowing how much dirt is needed to haul away or bring into the site. It is knowing how much 24" diameter smooth-lined plastic pipe (SLPP) is needed, how many type-c catch basins. It is knowing when there is an interference (two items trying to occupy the same space).

Having said that, SU can use components, but (unless I am unaware of any), be able to track quantities used for estimating. I think it is completely doable, but would take massive work to really be called a BIM system.

My thoughts only.

Rick