IfcColourRgb

Item	SPF	XML	Change	Description
IFC2x3 to IFC4
IfcColourRgb			MOVED	Schema 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

#	Attribute	Type	Cardinality	Description	C
2	Red	IfcNormalisedRatioMeasure	[1:1]	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
3	Green	IfcNormalisedRatioMeasure	[1:1]	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
4	Blue	IfcNormalisedRatioMeasure	[1:1]	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

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcPresentationItem
IfcColourSpecification
1	Name	IfcLabel	[0:1]	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.	X
IfcColourRgb
2	Red	IfcNormalisedRatioMeasure	[1:1]	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
3	Green	IfcNormalisedRatioMeasure	[1:1]	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
4	Blue	IfcNormalisedRatioMeasure	[1:1]	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

XSD 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;

 EXPRESS-G diagram

	RGB-Farbe
	Colour Rgb
	Couleur RGB