Protected	`class function IfcClassName: String; virtual;`
Protected	`function WantsGlobalId: Boolean; override;`
Published	`procedure AddIsDecomposedBy(const ChildObject: TIfcObjectDefinition);`
Public	`constructor Create(AOwner: TComponent); override;`
Public	`destructor Destroy; override;`
Public	`function BuildNode(const Mapping: TCastleIfcMapping): TTransformNode; override;`

Properties

Published	`property GlobalId: String read FGlobalId write FGlobalId;`
Published	`property OwnerHistory: TIfcOwnerHistory read FOwnerHistory write FOwnerHistory;`
Published	`property Name: TIfcLabel read FName write FName;`
Published	`property Description: TIfcText read FDescription write FDescription;`
Published	`property HasContext: TIfcRelDeclares read FHasContext write FHasContext;`
Published	`property IsDecomposedBy: TIfcRelAggregatesList read FIsDecomposedBy;`
Published	`property Decomposes: TIfcRelAggregatesList read FDecomposes;`
Published	`property HasAssociations: TIfcRelAssociatesList read FHasAssociations;`
Published	`property ObjectType: TIfcLabel read FObjectType write FObjectType;`
Published	`property LongName: TIfcLabel read FLongName write FLongName;`
Published	`property Phase: TIfcLabel read FPhase write FPhase;`
Published	`property RepresentationContexts: TIfcRepresentationContextList read FRepresentationContexts;`
Published	`property UnitsInContext: TIfcUnitAssignment read FUnitsInContext write FUnitsInContext;`
Published	`property IsDefinedBy: TIfcRelDefinesByPropertiesList read FIsDefinedBy;`
Published	`property Declares: TIfcRelDeclaresList read FDeclares;`

Description

Methods

Protected class function IfcClassName: String; virtual;

This item is declared in ancestor TIfcPersistent.

Name for the IFC standard, used in IFC files. By default, this is just ClassName with prefix 'T' removed.

Source: scene/load/ifc/castleifc_ifc_types.inc (line 56).

Protected function WantsGlobalId: Boolean; override;

This item is declared in ancestor TIfcRoot.

This item has no description. Showing description inherited from TIfcPersistent.WantsGlobalId.

If True, instances of this class will have GlobalId auto-assigned at saving, and they will be saved as part of the "data" list in IFC JSON files.

Strictly following the spec, this should be only defined for TIfcRoot, because only IfcRoot has GlobalId. In reality, we need GlobalId at TIfcPersistent to load some files, and we sometimes need WantsGlobalId = True to save some files.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1675).

Published procedure AddIsDecomposedBy(const ChildObject: TIfcObjectDefinition);

This item is declared in ancestor TIfcObjectDefinition.

Add given TIfcObjectDefinition instance to the IsDecomposedBy list of this object. Adds also new intermediate TIfcRelAggregates instance.

This shall be used to add top-level IfcSpatialStructureElement instances to the project, e.g.:

TIfcSite instance inside IfcProject,
IfcBuilding instance inside TIfcSite,
IfcBuildingStorey instance inside IfcBuilding

Properties

Published property GlobalId: String read FGlobalId write FGlobalId;

This item is declared in ancestor TIfcPersistent.

Globally unique identifier for the object instance.

Note: Not declared as TGUID, because TGUID cannot be published, but also we don't really need it: for our purposes, this identifier is just an arbitrary string.

Note: IFC 4.3 specification puts this only at IfcRoot, not at every IFC class. But testcase https://github.com/buildingsmart-community/Community-Sample-Test-Files/blob/main/IFC%204.0.2.1%20(IFC%204)/ISO%20Spec%20archive/wall-with-opening-and-window.json (from IFC 4.0) shows this can be present at any IFC class, in particular TIfcGeometricRepresentationContext.

In fact, TIfcGeometricRepresentationContext needs to have GlobalId to be successfully saved (avoid recursively trying to serialize it) in some cases. We indicate such classes with WantsGlobalId.

IFC JSON documentation says this, which seems to (unfortunately it is not unambiguous enough...) allow this at any IFC class: "Whereas the globalId attribute is only available to those elements that are descendent of the IfcRoot entity in the EXPRESS schema, we encourage a broader use of this globalId, to enable referencing between objects in a JSON file when useful.".

Source: scene/load/ifc/castleifc_ifc_types.inc (line 79).

Published property OwnerHistory: TIfcOwnerHistory read FOwnerHistory write FOwnerHistory;

This item is declared in ancestor TIfcRoot.

Information about the current ownership of that object.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1678).

Published property Name: TIfcLabel read FName write FName;

This item is declared in ancestor TIfcRoot.

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1680).

Published property Description: TIfcText read FDescription write FDescription;

This item is declared in ancestor TIfcRoot.

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1681).

Published property HasContext: TIfcRelDeclares read FHasContext write FHasContext;

This item is declared in ancestor TIfcObjectDefinition.

References to the context providing context information such as project unit or representation context. It should only be asserted for the uppermost non-spatial object.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1866).

Published property IsDecomposedBy: TIfcRelAggregatesList read FIsDecomposedBy;

This item is declared in ancestor TIfcObjectDefinition.

References to the decomposition relationship being an aggregation.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1869).

Published property Decomposes: TIfcRelAggregatesList read FDecomposes;

This item is declared in ancestor TIfcObjectDefinition.

References to the decomposition relationship being an aggregation.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1872).

Published property HasAssociations: TIfcRelAssociatesList read FHasAssociations;

This item is declared in ancestor TIfcObjectDefinition.

Reference to the relationship objects, that associates external references or other resource definitions to the object. Examples are the association to library, documentation or classification.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 1877).

Published property ObjectType: TIfcLabel read FObjectType write FObjectType;

The object type denotes a particular type that indicates the object further. The use has to be established at the level of instantiable subtypes.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5183).

Published property LongName: TIfcLabel read FLongName write FLongName;

Long name for the context as used for reference purposes.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5186).

Published property Phase: TIfcLabel read FPhase write FPhase;

Current project phase, or life-cycle phase of this project.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5189).

Published property RepresentationContexts: TIfcRepresentationContextList read FRepresentationContexts;

Context of the representations used within the context.