IfcAnnotationSurface
Definition
from IAI: An IfcAnnotationSurface is a
surface or solid with texture coordinates assigned. It provides the
capabilities
to assign
- surface shading information,
- surface rendering information
- surface lighting information
- surface textures
to a surface, or all surfaces
of a face based surface model, a shell
based surface model, or a solid model. If the assigned IfcSurfaceStyle
defines textures by including an instance of IfcSurfaceStyleWithTextures,
the attribute TextureCoordinates
determines the mapping of the
texture to the surface(s) of the Item.
In case of vertex based
geometry, texture maps may be used to define the texture coordinates
for each face.
The style information is linked by using the IfcStyledItem
to the IfcAnnotationSurface instance.
NOTE
No direct
corresponding STEP
entity, the entity has been defined in analogy to the other annotation
occurrence entity.
HISTORY
New entity in
Release IFC2x Edition 3.
EXPRESS specification:
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| WR01
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SIZEOF([
'IFCGEOMETRYRESOURCE.IFCSURFACE',
'IFCGEOMETRICMODELRESOURCE.IFCSHELLBASEDSURFACEMODEL',
'IFCGEOMETRICMODELRESOURCE.IFCFACEBASEDSURFACEMODEL',
'IFCGEOMETRICMODELRESOURCE.IFCSOLIDMODEL',
'IFCGEOMETRICMODELRESOURCE.IFCBOOLEANRESULT',
'IFCGEOMETRICMODELRESOURCE.IFCCSGPRIMITIVE3D']
* TYPEOF(Item)
) >= 1;
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Attribute definitions:
| Item
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Geometric representation item, providing the geometric definition of the annotated surface. It is further restricted to be a surface, surface model, or solid model.
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| TextureCoordinates
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Texture coordinates, such as a texture map, that are associated with the textures for the surface style. It should only be given, if the IfcSurfaceStyle associated to the IfcAnnotationSurfaceOccurrence contains an IfcSurfaceStyleWithTextures.
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Formal Propositions:
| WR01
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Only surfaces, surface models, solids and 3D primitives and CSG results are applicable as Items.
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Inheritance graph
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| ENTITY IfcAnnotationSurface;
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