Developing a CityGML/IFC interface to integrate BIM models with Geo models

Transcript

1. Developing a CityGML/IFC interface to integrate BIM models with Geo models First prototype meeting 2017-04-19
2. Recap: our goal and solution Develop an interface between CityGML and IFC to prepare for a fundamental solution to bridge the gap between Geo and BIM. 1. open-source API to represent IFC + CityGML with the same data structure 2. recommendations for future integration
3. Use case 1 Supporting the lifecycle of objects with a continuous information chain, ie using geoinformation in BIM application and IFC datasets in GIS applications.
4. Use case 1 Supporting the lifecycle of objects with a continuous information chain, ie using geoinformation in BIM application and IFC datasets in GIS applications.
5. Use case 2 Supporting the lifecycle of objects with a continuous information chain, ie using geoinformation in BIM application and IFC datasets in GIS applications.
6. Use case 2 Supporting the lifecycle of objects with a continuous information chain, ie using geoinformation in BIM application and IFC datasets in GIS applications. CHAPTER 3. REPRESENTATION SCHEMES edge−use opposite edge−use vertex sphere map svertex sedge oriented edge sphere map vertex edge−use svertex svertex svertex sedge oriented facet ure 3.3: A selective Nef complex: We show one facet with two vertices, their ere maps, the connecting edges, and both oriented facets. Shells and volumes omitted. ge-uses: An edge can have many incident facets (non-manifold situation). We introduce two oppositely oriented edge-uses for each incident facet; one for each orientation of the facet. An edge-use points to its corresponding ori- ented edge and to its oriented facet. We can uniquely identify each edge use with an shalfedge, or, in the special case, also with an shalfloop. cets: We store oriented halffacets as boundary cycles of oriented edge-uses. We http://doc.cgal.org/latest/Nef_3/index.html
7. Prototype status IFC entities supported so far
8. Simple primitives • IfcCartesianPoint • IfcDirection • IfcVector • IfcPlane
9. Placements / transformations • IfcAxis1Placement • IfcAxis2Placement2D • IfcAxis2Placement3D • IfcCartesianTransformationOperator2D • IfcCartesianTransformationOperator2DnonUniform • IfcCartesianTransformationOperator3D • IfcCartesianTransformationOperator3DnonUniform • IfcLocalPlacement
10. Curves/wires • IfcCircle • IfcEllipse • IfcLine • IfcEdge • IfcOrientedEdge • IfcEdgeLoop • IfcPolyLoop • IfcPolyline • IfcCompositeCurve • IfcTrimmedCurve ܜ଒ ܜଓ ܜଔ ܜକ
11. Faces • IfcArbitraryClosedProfileDef • IfcArbitraryProfileDefWithVoids • IfcRectangleProfileDef • IfcRoundedRectangleProfileDef • IfcRectangleHollowProfileDef • IfcTrapeziumProfileDef • IfcCircleProfileDef • IfcCircleHollowProfileDef • IfcEllipseProfileDef • IfcFace
12. Faces (more) • IfcCShapeProfileDef • IfcLShapeProfileDef • IfcIShapeProfileDef • IfcTShapeProfileDef • IfcUShapeProfileDef • IfcZShapeProfileDef • IfcDerivedProfileDef
13. Volumetric shapes • IfcExtrudedAreaSolid • IfcExtrudedAreaSolidTapered • IfcConnectedFaceSet • IfcCsgSolid • IfcBlock • IfcBooleanResult • IfcSphere • IfcRectangularPyramid • IfcRightCircularCylinder • IfcRightCircularCone • IfcTriangulatedFaceSet • IfcHalfSpaceSolid
14. • IfcRepresentation • IfcGeometricSet • IfcShellBasedSurfaceModel • IfcManifoldSolidBrep • IfcMappedItem • IfcFaceBasedSurfaceModel Abstract shapes
15. Status of received datasets
16. CUVO Ockenburghstraat KOW
17. Witte_de_Withstraat (20150508)
18. Rabarberstraat144
19. To do • Solve issues with exporting triangulated output with holes • Implement CityGML output • Tests with zoning plans (once received) • Use CityGML in design software? Export of all to IFC brep? Merge in one file? Worth it? • Test simplebim CityGML add-on (once licence is received)
20. Problems encountered so far • Validity issues in IFC datasets (e.g. precision, order- dependency, best way to do checks, etc.) • Discretising curves and surfaces, fitting faces to planes • Minimal approach in Geo vs. large number of classes in BIM • BIM concepts that differ in Geo software (e.g. faces)
22. Thank you!