Protected	`function WantsGlobalId: Boolean; virtual;`
Protected	`class function IfcClassName: String; virtual;`
Public	`constructor Create(AOwner: TComponent); override;`
Public	`destructor Destroy; override;`
Public	`function BuildNode(const Mapping: TCastleIfcMapping; const ParentProduct: TIfcProduct; const LitAppearance, UnlitAppearance: TAppearanceNode): TAbstractChildNode;`

Properties

Published	`property GlobalId: String read FGlobalId write FGlobalId;`
Published	`property AxisTag: TIfcLabel read FAxisTag write FAxisTag;`
Published	`property AxisCurve: TIfcCurve read FAxisCurve write FAxisCurve;`
Published	`property SameSense: Boolean read FSameSense write FSameSense;`
Published	`property PartOfU: TIfcGrid read FPartOfU write FPartOfU;`
Published	`property PartOfV: TIfcGrid read FPartOfV write FPartOfV;`
Published	`property PartOfW: TIfcGrid read FPartOfW write FPartOfW;`
Published	`property HasIntersections: TIfcVirtualGridIntersectionList read FHasIntersections;`

Description

Methods

Protected function WantsGlobalId: Boolean; virtual;

This item is declared in ancestor TIfcPersistent.

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_types.inc (line 52).

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).

Public constructor Create(AOwner: TComponent); override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3307).

Public destructor Destroy; override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3308).

Public function BuildNode(const Mapping: TCastleIfcMapping; const ParentProduct: TIfcProduct; const LitAppearance, UnlitAppearance: TAppearanceNode): TAbstractChildNode;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3309).

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 AxisTag: TIfcLabel read FAxisTag write FAxisTag;

The tag or name for this grid axis.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3314).

Published property AxisCurve: TIfcCurve read FAxisCurve write FAxisCurve;

Underlying curve which provides the geometry for this grid axis.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3317).

Published property SameSense: Boolean read FSameSense write FSameSense;

Defines whether the original sense of curve is used or whether it is reversed in the context of the grid axis.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 3321).

Published property PartOfU: TIfcGrid read FPartOfU write FPartOfU;

If provided, the IfcGridAxis is part of the UAxes of IfcGrid.