Natural language names
Specular Roughness
Rugosité pour le spéculaire
Semantic definitions at the type
Type definition

The IfcSpecularRoughness defines the datatype for the reflection resulting from the roughness of a surface through the height of surface impurities where the specular highlight is made sharper with small values for the roughness, such as 0.1. Applies to "glass", "metal", "mirror" and "plastic" reflection models. Larger values, close to 1.0 decrease the specular fall-off.

IfcSpecularRoughness is of type REAL. It is constraint to values between (and including) 0 and 1.

NOTE  The datatype relates to the definition of "shiness" in ISO/IEC 14772-1, which is the reciprocate value to the specular roughness.
HISTORY  New type in IFC2x2.
Formal Propositions
WR1Specular roughness shall be given as a non-negative value less than or equal to 1.0
Formal representations
XML Specification
 <xs:simpleType name="IfcSpecularRoughness">
  <xs:restriction base="xs:double"/>
EXPRESS Specification
TYPE IfcSpecularRoughness = REAL;
  WR1 : {0.0 <= SELF <= 1.0}

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcSpecularHighlightSelect

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