A building information model is typically constructed using two methodologies. The first is to model using tools designed to construct specific types of elements. For example a Wall tool is used to build a Wall or a Roof tool used to build a Roof. These tools are built-in to most authoring tools. The second methodology is to use objects. Objects can be both static (i.e. they are dimensionally fixed in height, length and width and are fixed in their settings) and parametric (i.e. can be a single object used for various dimensional requirements / settings).
Objects vary from authoring platform to authoring platform, including the terminology used, but the aim is largely the same. In this piece we will look at how these objects are made up for the Lego Villa Savoye project. This includes how these objects are compiled into a library to be added to an authoring file for use by the model author.
In order to build the Lego Villa Savoye model the first thing that needed to be done was to construct all the objects needed within the set. As mentioned already there are a variety of ways of doing this. (i.e static or parametric). For this project the objects are all modelled as static objects. Part of the reason for this approach was because I wanted to use the object names to drive much of the data that could be attached to the objects.
The first part of building these objects was to establish the dimensions of the objects. 90% of the objects are constrained by standard Lego sizes and the dimensions for the objects were based on the details contained on this website. Not all the objects were covered by this site but the ones that weren’t could largely be worked out as the whole Lego system is based on a modular approach.
Once the object sizes had been determined then the objects could be modelled. This was done using ARCHICAD’s Morph tool which allows the user to draw shapes and then push and pull these as required. A similar approach would be conducted in Trimble Sketchup. This modelling technique is a very straightforward process and requires no coding knowledge.
Having completed the modelling, each Lego component could be saved as an object. The objects were each saved with the Name and Colour of the object. Below is an example of one of the objects in the ARCHICAD Object dialogue.
Image: An object example in ARCHICAD
In order for objects to be easy to find within a model file they are typically ordered within a library. The structure of these libraries assists the model author in finding the required object to place into the model they are constructing.
Approaches to libraries varies by software so this part focusses on how this works in ARCHICAD. Whilst the approach will be different in other tools the principle of libraries and objects is largely the same.
For ARCHICAD libraries, the objects are placed in folders within a main library folder on a server. The organisation of these can vary as required and obviously this project the approach is very bespoke!
The library for this project has been organised by how users typically would approach a Lego project which is to focus their attentions on the colour of the piece they are looking for.
So folder names have been created to match the colours of the Lego blocks – Black, Bright Blue, Bright Orange, Bright Red, Dark Stone Grey, Earth Green, Medium Stone Grey, Transparent and White.
Each folder contains one of each type of object. For this project we have simply created one object for each type so each object name will appear in the library. For example their are 17 types of Black pieces and you will see each one in the image below.
However we could have taken a different approach and created less objects that were fully parametric. In fact we could have created only one object (using GDL programming in ARCHICAD) that could have had its settings adjusted to provide each geometry shape and colour we required. This requires knowledge of a specific programming language. This is incredibly powerful and can result in much smaller libraries. However like all the posts in this series I wanted to keep all the concepts simple to explain to lay people so I have not covered more on GDL programming here.
Image: The ARCHICAD library structure on a server showing the folders and the Black objects placed in the correct folder
Image: At the top are the libraries loaded into the file and below are the objects within the Black folder that a user can place into the model
Image: Bright Blue Object displayed in the Bright Blue folder
Image: Bright Red Object displayed in the Bright Red folder
Image: Dark Stone Grey Objects displayed in the Dark Stone Grey folder
Image: Earth Green Objects displayed in the Earth Green folder
Image: Medium Stone Grey Objects displayed in the Medium Stone Grey folder
Image: Transparent Objects displayed in the Transparent folder
Image: White Objects displayed in the White folder
Project files can have multiple libraries attached to them. As a company we typically have the out-of-the-box library, an office library and a project specific library attached to each file. The project specific library can be added to as the project develops so it is not critical to have all objects built before the project starts.
Well organised libraries and logically named objects form a crucial part of building information model files. Whilst there are obvious benefits to well organised and well constructed objects the real benefit will be to others in the process.
Rob Jackson, Associate Director, Bond Bryan Digital
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