BIM stands for – building information modeling – in addition to 3D CAD model spatial representation of an object BIM models add certain information, one could call it a database. Each element is defined (walls, windows, floors etc.) the model is parametric as a result 2D plans, sections and elevations can be generated automatically from any defined position or direction.
BIM models may also contain other then structural elements – so called MEP like electrical, pluming etc.
Exchanging data between BIM formats proofed to be changeling and it could cause some problems we can create native BIM models in two leading formats Revit (from AutoDesk), AECOSim (from Bentley Systems).
Same as on the ‘standard’ models deciding on the level of detail is crucial.
While the BIM process in its conception was a tool for new construction, as we are all aware a significant percentage of projects are concerned with the redevelopment of existing building stock. Throughout the lifecycle of a project 3D laser scanning becomes a key application. The foundation of any BIM process is the data that the design will be built upon. An appropriate scan to BIM model will provide the basis of this foundation.
At 3Deling we are highly experienced in the collection and processing of accurate point cloud data. 3D parametric models can be produced directly from the pointcloud, typically in Revit format however if required we can deliver in Bentley AECOsim.
From the model 2D sheets can be produced at any specified location for plans, sections or elevations. It should be noted that these sheets will not produce the same level of information as would normally be supplied on a typical 2D survey, however should it be required we can enhance this information manually if specified at the outset.
As with any survey data, specification is all important. In the BIM environment, due to the almost infinate variables available this becomes critical. We will work with our clients to define specification at the outset. Due to the collaborative nature of the BIM process it may be necessarys to consult a number of key stakeholders within the project before producing a definative specification.

See Level of Detail for BIM models >>> 

Things to Consider:
LOD (Level of Detail) How much detail do you need in the model? Think about what the plan for the building is. You may need high detail on a retained facade for example but low detail on internal partitioning if all you require is to quantify the volume that will be removed.
LOI (Level of Information) How much inteligence do you need from the modelled elements? Be aware that in an existing structure the surveyor may not be able access all elements of the building and will not have in depth knowledge in all disiplines. Discuss any likely limitations at the outset.

What coordinate system will be used? This is often overlooked but can be critical. Decide at the outset, protect it on site, ensure all stakeholders are aware of it and use it.
Base point of the model. Again often overlooked but difficult to change later. Decide on a location and ensure all stakeholders are aware. It will make federation of models from the various disiplines much easier if its consistent from day one.
BIM is a collaborative process. To gain the maximum benefit in terms of time and cost savings, just as with any building its important to start on firm foundations.


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Project examples - BIM models:

Historic Elevation in Płock
Villa Zgorzelec
Newcastle School
Manchester Library

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