Class TIfcIndexedPolygonalTextureMap

Unit

Declaration

type TIfcIndexedPolygonalTextureMap = class(TIfcIndexedTextureMap)

Description

Mapping of the 2-dimensional texture coordinates to a set of polygonal bounded faces onto which it is mapped. It is used for mapping the texture to faces of an IfcPolygonalFaceSet. Such faces may have inner loops.

Spec: https://standards.buildingsmart.org/IFC/RELEASE/IFC4_3/HTML/lexical/IfcIndexedPolygonalTextureMap.htm

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 757).

Hierarchy

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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 Create(AOwner: TComponent); override;
Public destructor Destroy; override;

Properties

Published property GlobalId: String read FGlobalId write FGlobalId;
Published property Maps: TIfcSurfaceTextureList read FMaps;
Published property MappedTo: TIfcTessellatedFaceSet read FMappedTo write FMappedTo;
Published property TexCoords: TIfcTextureVertexList_Spec read FTexCoords write FTexCoords;
Published property TexCoordIndices: TIfcTextureCoordinateIndicesList read FTexCoordIndices;

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 constructor Create(AOwner: TComponent); override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 705).

Public destructor Destroy; override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 706).

Public constructor Create(AOwner: TComponent); override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 761).

Public destructor Destroy; override;

This item has no description.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 762).

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 Maps: TIfcSurfaceTextureList read FMaps;

Reference to the one (or many in case of multi textures with identity transformation to geometric surfaces) subtype(s) of TIfcSurfaceTexture that are mapped to a geometric surface by the texture coordinate transformation.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 712).

Published property MappedTo: TIfcTessellatedFaceSet read FMappedTo write FMappedTo;

Reference to the IfcTessellatedFaceSet to which it applies the texture map.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 745).

Published property TexCoords: TIfcTextureVertexList_Spec read FTexCoords write FTexCoords;

Indexable list of texture vertices.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 748).

Published property TexCoordIndices: TIfcTextureCoordinateIndicesList read FTexCoordIndices;

Set of texture coordinate indices for polygonal faces with and without inner loops.

Source: scene/load/ifc/castleifc_ifc_standard_types.inc (line 766).


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