IfcSpecularHighlightSelect

Definition from IAI: The IfcSpecularHighlightSelect defines the selectable types of value for specular highlight sharpness.

> NOTE: The two select types relate to the different ways to specifiy the sharpness (or shininess) of the specular part of the reflectance equation. It relates to the attributes:

> - in ISO10303-46 the attribute specular_exponent is given
> - in VRML97 the attribute shininess is given

> For each surface side style only one of the two methods is needed for calculating the specular part of the equation

> HISTORY: New type in Release IFC2x 2nd Edition.

EXPRESS specification:

TYPE IfcSpecularHighlightSelect = SELECT
( | IfcSpecularExponent, IfcSpecularRoughness);
END_TYPE;