IfcColourRgb

Natural language names
RGB-Farbe
Colour Rgb
Couleur RGB
Change log
ItemSPFXMLChangeDescription
IFC2x3 to IFC4 4.0.0.0
    IfcColourRgbMOVEDSchema changed from IFCPRESENTATIONRESOURCE to IFCPRESENTATIONAPPEARANCERESOURCE.
IFC2x3 to IFC4 4.0.0.0
    IfcColourRgbMOVEDSchema changed from IFCPRESENTATIONRESOURCE to IFCPRESENTATIONAPPEARANCERESOURCE.
Semantic definitions at the entity
Entity definition

NOTE  Definition according to ISO/CD 10303-46:1992
A colour rgb as a subtype of colour specifications is defined by three colour component values for red, green, and blue in the RGB colour model.

NOTE  In contrary to the usual value range of colour components being integer from 0...255, the definition from ISO10303-46 defines the colour components as real from 0.0 ... 1.0. Applications need to execute this conversion before populating the colour RGB values.

NOTE  Corresponding STEP name: colour_rgb. The name attribute has been omitted, the data type for the reg, green and blue parts is IfcNormalizedRatioMeasure, that already includes the range restrictions for the values. Please refer to ISO/IS 10303-46:1994, p. 138 for the final definition of the formal standard.

HISTORY  New entity in IFC2x2.

Attribute definitions
#AttributeTypeCardinalityDescription G
2RedIfcNormalisedRatioMeasure The intensity of the red colour component.
NOTE  The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual.
X
3GreenIfcNormalisedRatioMeasure The intensity of the green colour component.
NOTE  The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual.
X
4BlueIfcNormalisedRatioMeasure The intensity of the blue colour component.
NOTE  The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual.
X
Inherited definitions from supertypes
Entity inheritance IfcColourSpecification IfcPresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcPresentationItem
IfcColourSpecification
1NameIfcLabel? Optional name given to a particular colour specification in addition to the colour components (like the RGB values).
EXAMPLE  Names of a industry colour classification, such as RAL.
IFC2x3 CHANGE  Attribute added.
X
IfcColourRgb
2RedIfcNormalisedRatioMeasure The intensity of the red colour component.
NOTE  The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual.
X
3GreenIfcNormalisedRatioMeasure The intensity of the green colour component.
NOTE  The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual.
X
4BlueIfcNormalisedRatioMeasure The intensity of the blue colour component.
NOTE  The colour component value is given within the range of 0..1, and not within the range of 0..255 as otherwise usual.
X
Formal representations
XML Specification
 <xs:element name="IfcColourRgb" type="ifc:IfcColourRgb" substitutionGroup="ifc:IfcColourSpecification" nillable="true"/>
 <xs:complexType name="IfcColourRgb">
  <xs:complexContent>
   <xs:extension base="ifc:IfcColourSpecification">
    <xs:attribute name="Red" type="ifc:IfcNormalisedRatioMeasure" use="optional"/>
    <xs:attribute name="Green" type="ifc:IfcNormalisedRatioMeasure" use="optional"/>
    <xs:attribute name="Blue" type="ifc:IfcNormalisedRatioMeasure" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcColourRgb
 SUBTYPE OF (IfcColourSpecification);
  Red : IfcNormalisedRatioMeasure;
  Green : IfcNormalisedRatioMeasure;
  Blue : IfcNormalisedRatioMeasure;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcSurfaceStyleLighting IfcSurfaceStyleShading IfcColourOrFactor IfcLightSource IfcLightSourceGoniometric

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