IfcIndexedPolygonalTextureMap

Natural language names

Semantic definitions at the entity

Entity definition

The IfcIndexedPolygonalTextureMap provides the 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.

The TexCoords defined at supertype IfcIndexedTextureMap are a two-dimensional list of texture coordinates providing two parameter values for each indexed texture vertex. The set of TexCoordIndices provides the texture coordinates for the list of IfcIndexedPolygonalFace referred to via MappedTo.Faces. The texture coordinates at each IfcTextureCoordinateIndices correspond to the vertex points at the referenced IfcIndexedPolygonalFace. See also Figure 543 for further explanation.

Figure 543 shows how to use IfcIndexedPolygonalTextureMap to provide the texture and texture coordinates for IfcPolygonalFaceSet.

Instantiation diagram showing the use of IfcIndexedPolygonalTextureMap

Figure 543 — Use of IfcIndexedPolygonalTextureMap

HISTORY New entity in IFC4.3.0.0

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
4	TexCoordIndices	IfcTextureCoordinateIndices	S[1:?]	Set of texture coordinate indices for polygonal faces with and without inner loops.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcPresentationItem
IfcTextureCoordinate
1	Maps	IfcSurfaceTexture	L[1:?]	Reference to the one (or many in case of multi textures with identity transformation to geometric surfaces) subtype(s) of IfcSurfaceTexture that are mapped to a geometric surface by the texture coordinate transformation.	X
IfcIndexedTextureMap
2	MappedTo	IfcTessellatedFaceSet		Reference to the IfcTessellatedFaceSet to which it applies the texture map.	X
3	TexCoords	IfcTextureVertexList		Indexable list of texture vertices.	X
IfcIndexedPolygonalTextureMap
4	TexCoordIndices	IfcTextureCoordinateIndices	S[1:?]	Set of texture coordinate indices for polygonal faces with and without inner loops.	X

Formal representations

XML Specification

 <xs:element name="IfcIndexedPolygonalTextureMap" type="ifc:IfcIndexedPolygonalTextureMap" substitutionGroup="ifc:IfcIndexedTextureMap" nillable="true"/>

 <xs:complexType name="IfcIndexedPolygonalTextureMap">

  <xs:complexContent>

   <xs:extension base="ifc:IfcIndexedTextureMap">

    <xs:sequence>

     <xs:element name="TexCoordIndices">

      <xs:complexType>

       <xs:sequence>

        <xs:element ref="ifc:IfcTextureCoordinateIndices" maxOccurs="unbounded"/>

       </xs:sequence>

       <xs:attribute ref="ifc:itemType" fixed="ifc:IfcTextureCoordinateIndices"/>

       <xs:attribute ref="ifc:cType" fixed="set"/>

       <xs:attribute ref="ifc:arraySize" use="optional"/>

      </xs:complexType>

     </xs:element>

    </xs:sequence>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcIndexedPolygonalTextureMap

 SUBTYPE OF (IfcIndexedTextureMap);

  TexCoordIndices : SET [1:?] OF IfcTextureCoordinateIndices;

END_ENTITY;

 EXPRESS-G diagram

References: IfcTextureCoordinateIndices

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