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Warren, Our
approach to 3D IFC import is based on the observation that most 3D CAD models
have been - and in the future will be - formulated for other primary purposes
than thermal performance simulation. They are rarely appropriate as is but an
engineer needs to be able to control the mapping between model spaces and
thermal zones. Quite often a more or less manual selection will be the most
practical, e.g. the model may contain all the rooms of a building and for the
thermal model, you want to study perhaps a single floor or a group of
exceptional rooms. Our
thermal tool, IDA Indoor Climate and Energy 3.0, has it own 3D geometrical
modeler into which one may import an IFC 1.5.1 or 2.0 model as a (3D)
"background model". The user then instantiates the individual IFC spaces or
groups of spaces that he or she wishes to study. This has proven to be a
powerful time-saver and has been commercially available for about a year.
Other
information such as constructions may also be imported from the IFC model,
should they be present there. However, this is rarely the case in today?s
practice, where it seems that most 3D models are still defined for a single
purpose, such as making a visualization, rather than being a generally
applicable description of the building. We have seen some pretty ?interesting?
3D models from unaware CAD modelers. There is a demo session showing a simple case of IFC import on www.equa.se/ice Best
regards, Per
Sahlin
------------------------------------------ From: postman@xxxxxxxx [mailto:postman@xxxxxxxx]On Behalf Of Warren A. Campbell Sent: Sunday, September 01, 2002 8:54 PM To: Bldg-sim@xxxxxxxx Subject: [Bldg-sim] 3D Modeling / Energy Analysis Compatibility
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