IFC 4.3.x development IfcSurfaceStyleRefraction Semantic definitions at the entity

IfcSurfaceStyleRefraction extends the surface style lighting, or the surface style rendering definition for properties for calculation of physically exact illuminance by adding seldomly used properties. Currently this includes the refraction index (by which the light ray refracts when passing through a prism) and the dispersion factor (or Abbe constant) which takes into account the wavelength dependency of the refraction.

NOTE  If such refraction properties are used, the IfcSurfaceStyle should include within its set of Styles (depending on whether rendering or lighting is used) an instance of IfcSurfaceStyleLighting and IfcSurfaceStyleRefraction, or an instance of IfcSurfaceStyleRendering and IfcSurfaceStyleRefraction.

HISTORY  New entity in IFC2x2. Attributes

#Attribute Type Description
1RefractionIndex OPTIONAL IfcRealThe index of refraction for all wave lengths of light. The refraction index is the ratio between the speed of light in a vacuum and the speed of light in the medium. E.g. glass has a refraction index of 1.5, whereas water has an index of 1.33
2DispersionFactorOPTIONAL IfcRealThe Abbe constant given as a fixed ratio between the refractive indices of the material at different wavelengths. A low Abbe number means a high dispersive power. In general this translates to a greater angular spread of the emergent spectrum. Entity inheritance

dot_inheritance IfcSurfaceStyleRefraction IfcSurfaceStyleRefraction IfcPresentationItem IfcPresentationItem IfcSurfaceStyleRefraction->IfcPresentationItem IfcPresentationItem_children 16 more... IfcPresentationItem_children->IfcPresentationItem Formal representations

ENTITY IfcSurfaceStyleRefraction
 SUBTYPE OF (IfcPresentationItem);
	RefractionIndex : OPTIONAL IfcReal;
	DispersionFactor : OPTIONAL IfcReal;