IFC4.3.x-development

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Officially published schema has dev mark in name

1

Want to share here https://github.com/buildingSMART/IFC4.3.x-output/issues/619

I-Sokolov

IFCPolynomialCurve is missing a clear definition

6

I think we should provide a short definition of a polynomial curve in IFC beyond `Polynomial Curve`. How should the coefficients be applied? should it be:` IFCPOLYNOMIALCURVE([#], (0.0,1.0,3.14), [y], [z])...

Tgest

Check Status on https://ifc43-docs.standards.buildingsmart.org/IFC/RELEASE/IFC4x3/HTML/lexical/Pset_ActuatorPHistory.htm https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD2_TC1/HTML/schema/ifcbuildingcontrolsdomain/pset/pset_actuatorphistory.htm

SebQonic

e.g. Ifc4.Pset_BuildingElementProxyProvisionForVoid.Shape => Ifc4x3.Pset_ProvisionForVoid.VoidShape. This is really annoying for implementers. Please provide a flatlisted changelog.

SebQonic

Structural Analysis Model

17

In the validation service, the types of topological representation (https://ifc43-docs.standards.buildingsmart.org/IFC/RELEASE/IFC4x3/HTML/lexical/IfcTopologyRepresentation.htm) must be added to the valid_representation_type csv file, because for structural members (that are related to topological representations), the service...

GioStamoulos

Proposed documentation change and rules for IfcOffsetCurveByDistances

4

In [5.4.3.1](https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcAlignment.htm) IfcOffsetCurveByDistances is described as `IfcOffsetCurveByDistances as a 2D or 3D curve defined relative to an IfcGradientCurve or another IfcOffsetCurveByDistances.` IfcGradientCurve is 3D so 2D doesn't make sense. Suggest...

RickBrice

Ambiguity on whether nesting is part of the spatial decomposition

1

The [element nesting concept](https://ifc43-docs.standards.buildingsmart.org/IFC/RELEASE/IFC4x3/HTML/concepts/Object_Composition/Nesting/Element_Nesting/content.html) describes this: > The hosted component should not be contained in the spatial hierarchy, i.e. the concept Spatial Containment shall not be used at the level...

Moult

Default value for IfcAxis2PlacementLinear.Axis is not defined

2

The default value of IfcAxis2PlacementLinear.Axis is not defined. Using IfcAxis2Placement3D for inspiration, you could say that the default Axis is (0,0,1). However, IfcAxis2PlacementLinear.RefDirection, when omitted, is taken from the curve...

RickBrice

IfcAxis2Placement3D is clear that either both Axis and RefDirection are either both provided or neither are provided. IfcAxis2PlacementLinear does not state such a requirement. Should it?

RickBrice

Should IfcSegmentedReferenceCurve be a subtype of IfcGradientCurve?

1

This is a bit of a minor thing, but should IfcSegmentedReferenceCurve be a subtype of IfcGradientCurve? It's a backwards compatible change to make. It would make things more consistent, and...

aothms