Class TIfcDirection
Unit
Declaration
type TIfcDirection = class(TIfcPersistent)
Description
Direction in 2D or 3D.
Spec: https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcDirection.htm
Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 417).
Hierarchy
- TObject
- TPersistent
- TComponent
- TIfcPersistent
- TIfcDirection
Overview
Methods
| Protected | function WantsGlobalId: Boolean; virtual; |
| Protected | class function IfcClassName: String; virtual; |
| Public | constructor Create(AOwner: TComponent); override; |
| Public | destructor Destroy; override; |
| Public | constructor CreateVector(const AOwner: TComponent; const AVector: TVector3); |
Properties
| Published | property GlobalId: String read FGlobalId write FGlobalId; |
| Published | property DirectionRatios: TCastleVector3PersistentSimple read FDirectionRatios; |
Description
Methods
| Protected | function WantsGlobalId: Boolean; virtual; |
|
If 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 | |
| Protected | class function IfcClassName: String; virtual; |
|
Name for the IFC standard, used in IFC files. By default, this is just ClassName with prefix 'T' removed. | |
| Public | constructor Create(AOwner: TComponent); override; |
|
FDim: TIfcDimensionCount; Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 426). | |
| Public | destructor Destroy; override; |
|
This item has no description. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 427). | |
| Public | constructor CreateVector(const AOwner: TComponent; const AVector: TVector3); |
|
Create instance with given direction ratios. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 430). | |
Properties
| Published | property GlobalId: String read FGlobalId write FGlobalId; |
|
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 IFC JSON documentation says this, which seems to (unfortunately it is not unambiguous enough...) allow this at any IFC class: "Whereas the | |
| Published | property DirectionRatios: TCastleVector3PersistentSimple read FDirectionRatios; |
|
Defined as 2 or 3 values of TIfcReal type. In practice, this is just a 3D vector for our engine. Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 440). | |
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