software lab presentation
TRANSCRIPT
Transforming Building Information Modeling based product models to STEP-Format
SOFTWARE LAB Final PresentationShahbaz HaiderYousuf DinarAthanasios Tegos
SUPERVISORS:Felix Frischmann Julian Amann Dr.-Ing. Stefan TrometerChair for Computation in Engineering Computational Modeling and Simulation CADFEM GmbH, [email protected] [email protected] [email protected]
Transformation of Building Information Modeling based product models to STEP-Format
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ContentITask OverviewII TimelineIII Model Abstraction - LOD 1 (Standard and Oriented Bounding Boxes) - LOD 2 - LOD 3 - LOD 4 - BIM IVPreview in GUI VVideoVI Conclusion
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I Task Overview
Understand and handle IFC-based building product models
IFC TO STEPData conversion: Ifc2Step format Model change: model abstraction LOD 1-4 models
ANSYS/CADFEMsimulations based onsimulation modelderived from IFC-modelChair for Computation in EngineeringChair of Computational Modeling and Simulation
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1st Presentation2nd PresentationFinal PresentationChair for Computation in EngineeringChair of Computational Modeling and Simulation
Development conceptGetting familiar with Qt, OpenCascade, IfcOpenShellCreation platform and tools
Getting familiar with OpenCascade IFC openshellCreation of GUI IFC to STEPModel Abstraction- LOD 1 (Standard Bounding Box)
Model Abstraction - LOD 1 (Oriented Bounding Box) - LOD 2 - LOD 3 - LOD 4 Preview in GUIImprovements in GUI
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III MODEL ABSTRACTIONWhy its necessary ?How to do it ? Level of details .
- LOD 1 (Standard and Oriented Bounding Boxes) - LOD 2 - LOD 3 - LOD 4 - BIM
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LOD-1
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LOD-1Creation of Bounding Box
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Revit Model (IFC)LOD 1Bounding Box
LOD-1 (Standard Box)
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Revit Model (IFC)LOD 1Bounding Box
LOD-1 (Oriented Bounding Box)
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DefinitionA volume that bounds (encapsulates) one, or more, objects.Bounded objects can have arbitrarily complex geometry.Ideal Characteristics Some desired properties include:Tight fitting around the bounded objectsInexpensive computationEasy transformation (e.g. rotation)Little memory requirement for storage
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Bounding Volume Categories
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Arbitrarily oriented rectangular boundsFaces are aligned with the coordinate axes of its parent coordinate systemMany possible representationsBounding VolumesAxis-Aligned Bounding Boxes (AABB)Oriented Bounding Boxes (OBB)
Also called Standard Bounding Boxes (SBB) Rectangular six-sided boxes whose face normals are parallel to the axes of the coordinate system
LOD-1 (Oriented Bounding Box)
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Standard Bounding Box TopView IfcWall TopView Oriented Bounding Box TopView
LOD-1 (Oriented Bounding Box)
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12Standard Bounding BoxRevit BuildingModelOriented Bounding Box
Oriented vs Standard Bounding Box
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An OBB appears the following advantages and disadvantages over the AABBAdvantagesMinimization of the bounding volumeBetter approximation of shapesSignificant reduction of the necessary geometric tests against real geometryDisadvantagesMore complex and expensive distance and intersection of two bounding boxes13
LOD-2
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LOD-2
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LOD 2 LOD 2 with Roof
Revit Model (IFC)
LOD-3 Approaches
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LOD 3 LOD 3 at certain orientation
Revit Model (IFC)
LOD-3 LIMITATIONS
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Bounding Box of StoreyBalconyWindow
Rectangular Building Non-Rectangular Building Bounding Box of Storeyhttp://resources.esri.com/help/9.3/arcgisdesktop/com/gp_toolref/data_management_tools/how_simplify_building_data_management_works.html
LOD-4
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LOD-4
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Revit Model (IFC)
BIM
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BIM (STEP)Revit Model (IFC)
BIM
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BIM (STEP)Revit Model (IFC)
IV Preview in GUI
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V Video
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VI ConclusionCreated basic structure for conversion from IFC to Step, abstraction of the model, and visualization of final result Tested different models and results were quite promising. Improvements in GUI (preview section)Limitations of LOD 2Limitations of LOD 3Scope of the project can be extended integrating our models in existing big city models for large scale simulations
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Thank you for your attention
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