Class TIfcCompositeCurve

Description
Hierarchy
Methods
Properties

Unit

CastleIfc

Declaration

type TIfcCompositeCurve = class(TIfcBoundedCurve)

Description

IFC class IfcCompositeCurve.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5923).

Hierarchy

Show Additional Members:

Overview

Methods

Protected function WantsGlobalId: Boolean; virtual;
Protected class function IfcClassName: String; virtual;
Public function BuildNode(const Mapping: TCastleIfcMapping; const ParentProduct: TIfcProduct; const LitAppearance, UnlitAppearance: TAppearanceNode): TAbstractChildNode; virtual;
Public procedure UpdateCrossSection(const CrossSection: TVector2List; var CrossSectionConvex: Boolean); 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; override;

Properties

Published property GlobalId: String read FGlobalId write FGlobalId;
Published property LayerAssignment: TIfcPresentationLayerAssignment read FLayerAssignment write FLayerAssignment;
Published property StyledByItem: TIfcStyledItem read FStyledByItem write FStyledByItem;
Published property Segments: TIfcSegmentList read FSegments;
Published property SelfIntersect: TIfcLogical read FSelfIntersect write FSelfIntersect;

Description

Methods

Protected function WantsGlobalId: Boolean; virtual;

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;

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

Build a node to display this using Castle Game Engine. Returns Nil if not possible / not implemented.

Parameters
ParentProduct
Parent TIfcProduct, to be used with TCastleIfcMapping.ConnectShapeAndProduct call.

It can be Nil (and TCastleIfcMapping.ConnectShapeAndProduct is already prepared to handle it too) if no particular TIfcProduct is parent of this, which (right now) only happens for some internal usage in UpdateCrossSection for throw-away shape instances.

LitAppearance
Appearance that should be used for all shapes created here, if they are supposed to be lit (made of polygons). May be given as Nil.
UnlitAppearance
Appearance that should be used for all shapes created here, if they are supposed to be unlit (made of lines, points). May be given as Nil.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 368).

Public procedure UpdateCrossSection(const CrossSection: TVector2List; var CrossSectionConvex: Boolean); virtual;

Update CrossSection to be used by IfcExtrudedAreaSolid. In the base class, this reuses BuildNode and extracts cross section information from a temporary node. Override to provide more optimized implementation.

Set CrossSectionConvex to False if the cross-section is potentially concave. By default we assume faster True, so convex.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 934).

Public constructor Create(AOwner: TComponent); override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5928).

Public destructor Destroy; override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5929).

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

This item has no description. Showing description inherited from TIfcRepresentationItem.BuildNode.

Build a node to display this using Castle Game Engine. Returns Nil if not possible / not implemented.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5931).

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 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 LayerAssignment: TIfcPresentationLayerAssignment read FLayerAssignment write FLayerAssignment;

Assignment of the representation item to a single or multiple layer(s). Nil if none.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 374).

Published property StyledByItem: TIfcStyledItem read FStyledByItem write FStyledByItem;

Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve. Nil if none.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 380).

Published property Segments: TIfcSegmentList read FSegments;

The component bounded curves, their transitions and senses. The transition attribute for the last segment defines the transition between the end of the last segment and the start of the first; this transition attribute may take the value discontinuous, which indicates an open curve.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5940).

Published property SelfIntersect: TIfcLogical read FSelfIntersect write FSelfIntersect;

Indication of whether the curve intersects itself or not; this is for information only.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 5944).

Generated by PasDoc 0.17.0.snapshot.

Copyright Michalis Kamburelis and Castle Game Engine Contributors.

This webpage is also open-source and we welcome pull requests to improve it.

We use cookies for analytics. See our privacy policy.