IfcOpticalMaterialProperties

Definition from IAI: A container class with material optical properties defined in IFC specification.

> HISTORY: New entity in Release IFC2x.

EXPRESS specification:

ENTITY IfcOpticalMaterialProperties
SUBTYPE OF ( | IfcMaterialProperties);
VisibleTransmittance | : | OPTIONAL IfcPositiveRatioMeasure;
SolarTransmittance | : | OPTIONAL IfcPositiveRatioMeasure;
ThermalIrTransmittance | : | OPTIONAL IfcPositiveRatioMeasure;
ThermalIrEmissivityBack | : | OPTIONAL IfcPositiveRatioMeasure;
ThermalIrEmissivityFront | : | OPTIONAL IfcPositiveRatioMeasure;
VisibleReflectanceBack | : | OPTIONAL IfcPositiveRatioMeasure;
VisibleReflectanceFront | : | OPTIONAL IfcPositiveRatioMeasure;
SolarReflectanceFront | : | OPTIONAL IfcPositiveRatioMeasure;
SolarReflectanceBack | : | OPTIONAL IfcPositiveRatioMeasure;
UNIQUE
UR11 | : | Material;
END_ENTITY;

Attribute definitions:

VisibleTransmittance | : | Transmittance at normal incidence (visible). Defines the fraction of the visible spectrum of solar radiation that passes through per unit area, perpendicular to the surface.
SolarTransmittance | : | Transmittance at normal incidence (solar). Defines the fraction of solar radiation that passes through per unit area, perpendicular to the surface.
ThermalIrTransmittance | : | Thermal IR transmittance at normal incidence. Defines the fraction of thermal energy that passes through per unit area, perpendicular to the surface.
ThermalIrEmissivityBack | : | Thermal IR emissivity: back side. Defines the fraction of thermal energy emitted per unit area to "blackbody" at the same temperature, through the "back" side of the material.
ThermalIrEmissivityFront | : | Thermal IR emissivity: front side. Defines the fraction of thermal energy emitted per unit area to "blackbody" at the same temperature, through the "front" side of the material.
VisibleReflectanceBack | : | Reflectance at normal incidence (visible): back side. Defines the fraction of the solar ray in the visible spectrum that is reflected and not transmitted when the ray passes from one medium into another, at the "back" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.
VisibleReflectanceFront | : | Reflectance at normal incidence (visible): front side. Defines the fraction of the solar ray in the visible spectrum that is reflected and not transmitted when the ray passes from one medium into another, at the "front" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.
SolarReflectanceFront | : | Reflectance at normal incidence (solar): front side. Defines the fraction of the solar ray that is reflected and not transmitted when the ray passes from one medium into another, at the "front" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.
SolarReflectanceBack | : | Reflectance at normal incidence (solar): back side. Defines the fraction of the solar ray that is reflected and not transmitted when the ray passes from one medium into another, at the "back" side of the other material, perpendicular to the surface. Dependent on material and surface characteristics.

Inheritance graph

ENTITY IfcOpticalMaterialProperties;
ENTITY IfcMaterialProperties;
Material | : | IfcMaterial;
ENTITY IfcOpticalMaterialProperties;
VisibleTransmittance | : | OPTIONAL IfcPositiveRatioMeasure;
SolarTransmittance | : | OPTIONAL IfcPositiveRatioMeasure;
ThermalIrTransmittance | : | OPTIONAL IfcPositiveRatioMeasure;
ThermalIrEmissivityBack | : | OPTIONAL IfcPositiveRatioMeasure;
ThermalIrEmissivityFront | : | OPTIONAL IfcPositiveRatioMeasure;
VisibleReflectanceBack | : | OPTIONAL IfcPositiveRatioMeasure;
VisibleReflectanceFront | : | OPTIONAL IfcPositiveRatioMeasure;
SolarReflectanceFront | : | OPTIONAL IfcPositiveRatioMeasure;
SolarReflectanceBack | : | OPTIONAL IfcPositiveRatioMeasure;
END_ENTITY;