Class Ifc4x2::IfcSurfaceStyleLighting

Nested Relationships

This class is a nested type of Struct Ifc4x2.

Inheritance Relationships

Base Type

Class Documentation

class Ifc4x2::IfcSurfaceStyleLighting : public Ifc4x2::IfcPresentationItem

IfcSurfaceStyleLighting is a container class for properties for calculation of physically exact illuminance related to a particular surface style.

Figure 294 shows the reflection and transmission components from an incident ray. The sum of the components for reflection and transmission is a value of 1.0 denoting that the incident ray is completely decomposed into reflection and transmission components. Each value of reflection and transmission is therefore within the range 0.0 to 1.0.

Figure 294 — Surface style lighting

All these factors can be measured physically and are ratios for the red, green and blue part of the light. These properties are defined in the model as Type IfcColorRGB with a factor for each colour.

EXAMPLE A green glass transmits only green light, so its transmission factor is 0.0 for red, between 0.0 and 1.0 for green and 0.0 for blue. A green surface reflects only green light, so the reflectance factor is 0.0 for red, between 0.0 and 1.0 for green and 0.0 for blue.

HISTORY New entity in IFC 2x2.

Public Types

typedef IfcTemplatedEntityList<IfcSurfaceStyleLighting> list

Public Functions

::Ifc4x2::IfcColourRgb *DiffuseTransmissionColour() const

The degree of diffusion of the transmitted light. In the case of completely transparent materials there is no diffusion. The greater the diffusing power, the smaller the direct component of the transmitted light, up to the point where only diffuse light is produced.A value of 1 means totally diffuse for that colour part of the light. The factor can be measured physically and has three ratios for the red, green and blue part of the light.

void setDiffuseTransmissionColour(::Ifc4x2::IfcColourRgb *v)
::Ifc4x2::IfcColourRgb *DiffuseReflectionColour() const

The degree of diffusion of the reflected light. In the case of specular surfaces there is no diffusion. The greater the diffusing power of the reflecting surface, the smaller the specular component of the reflected light, up to the point where only diffuse light is produced. A value of 1 means totally diffuse for that colour part of the light. The factor can be measured physically and has three ratios for the red, green and blue part of the light.

void setDiffuseReflectionColour(::Ifc4x2::IfcColourRgb *v)
::Ifc4x2::IfcColourRgb *TransmissionColour() const

Describes how the light falling on a body is totally or partially transmitted. The factor can be measured physically and has three ratios for the red, green and blue part of the light.

void setTransmissionColour(::Ifc4x2::IfcColourRgb *v)
::Ifc4x2::IfcColourRgb *ReflectanceColour() const

A coefficient that determines the extent that the light falling onto a surface is fully or partially reflected. The factor can be measured physically and has three ratios for the red, green and blue part of the light.

void setReflectanceColour(::Ifc4x2::IfcColourRgb *v)
const IfcParse::entity &declaration() const
IfcSurfaceStyleLighting(IfcEntityInstanceData *e)
IfcSurfaceStyleLighting(::Ifc4x2::IfcColourRgb *v1_DiffuseTransmissionColour, ::Ifc4x2::IfcColourRgb *v2_DiffuseReflectionColour, ::Ifc4x2::IfcColourRgb *v3_TransmissionColour, ::Ifc4x2::IfcColourRgb *v4_ReflectanceColour)

Public Static Functions

const IfcParse::entity &Class()