Hi, I am working on exporting IFC file for both cylinder and cone geometries (in fact my geometry are MSB(manifold solid brep) solid/surface body) under IFC4 schema DTV mvd. I found I have two ways to represent cylinder geometry: by IfcAdvancedBrep / IfcShellBasedSurfaceModel with underline surfa…

For a cone I use ifcExtrudedAreaSolidTapered [image] Any tools can view and measure ifc4 includes geometry type is IFCADVANCEDBREP In search of a reference viewer (which I miss at bS) I tried BIMcollab. It understand ifcExtrudedAreaSolidTapered too. This saves a lot of t…

[image] bsbock: ifcExtrudedAreaSolidTapered Thanks! Use this seems make sense to create for a solid cone. Do you have any clue how to represent a surface cone geometry?

Also, what’s the consideration for not using IfcRightCircularCone? thttps://standards.buildingsmart.org/IFC/DEV/IFC4_2/FINAL/HTML/schema/ifcgeometricmodelresource/lexical/ifcrightcircularcone.htm

Do you have any clue how to represent a surface cone geometry? … I think, you must calculate all face-points and than you can use https://standards.buildingsmart.org/IFC/DEV/IFC4_2/FINAL/HTML/link/ifcfacetedbrep.htm but the Information, that it is a cone, is lost.

I see no reason not to use ifcRightCircularCone for a not tapered cone. Both are ifcGeometricRepresentationItem, see inheritance (extract without ifc-prefix): GeometricRepresentationItem .SolidModel . .SweptAreaSolid . . .RevolvedAreaSolid . . . …

Thank you @bsbock ! I see solid cone representation is quite flexible. however if we want keep surface cone body (with the cone information), then ifcRightCircularCone /ifcExtrudedAreaSolidTapered can’t fit well. Instead I noticed there is a IfcSurfaceOfRevolution can act as inner geometry type to ma…

AdvancedBrep with IfcCylindricalSurface Vs. IfcRightCircularCylinder

Developers

bsbock September 5, 2019, 4:53pm 2

For a cone I use ifcExtrudedAreaSolidTapered

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AdvancedBrep with IfcCylindricalSurface Vs. IfcRightCircularCylinder

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