IFC (IFC4X3_ADD2) under development IfcIndexedPolygonalTextureMap Semantic 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 for further explanation.

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

Instantiation diagram showing the use of _IfcIndexedPolygonalTextureMap_
Figure — Use of _IfcIndexedPolygonalTextureMap_ Entity inheritance Attributes

# Attribute Type Description
IfcTextureCoordinate (1)
1 Maps LIST [1:?] OF IfcSurfaceTexture

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.

IfcIndexedTextureMap (2)
2 MappedTo IfcTessellatedFaceSet

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

3 TexCoords IfcTextureVertexList

Indexable list of texture vertices.

Click to show 3 hidden inherited attributes Click to hide 3 inherited attributes
IfcIndexedPolygonalTextureMap (1)
4 TexCoordIndices SET [1:?] OF IfcTextureCoordinateIndices

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

Table Formal representation

ENTITY IfcIndexedPolygonalTextureMap
 SUBTYPE OF (IfcIndexedTextureMap);
	TexCoordIndices : SET [1:?] OF IfcTextureCoordinateIndices;
END_ENTITY; References

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