Natural language names
Gerader Kreiskegel
Right Circular Cone
Cône de révolution
Semantic definitions at the entity
Entity definition

The IfcRightCircularCone is a Construction Solid Geometry (CSG) 3D primitive. It is a solid with a circular base and a point called apex as the top. The tapers from the base to the top. The axis from the center of the circular base to the apex is perpendicular to the base. The inherited Position attribute defines the IfcAxisPlacement3D and provides the location and orientation of the cone:

Figure 369 illustrates geometric parameters of the cone. The cone is positioned within its own placement coordinate system. The origin is the center of the bottom circular disk, that lies in the XY plane. The apex lies on the positive z axis at [0, 0, Height].


Figure 369 — Right circular cone geometry

NOTE  Entity adapted from right_circular_cone defined in ISO 10303-42.
HISTORY  New entity in IFC2x3

Texture use definition

On the circular side, textures are aligned facing upright with origin at the back (+Y direction) revolving counter-clockwise. Textures are stretched or repeated to the extent of the base circumference according to RepeatS. Textures are compressed linearly going upwards towards the top point according to RepeatT.

On the bottom face, textures are aligned facing front-to-back, with the center of the circle aligned to the center of the texture.

Figure 370 illustrates default texture mapping with a clamped texture (RepeatS=False and RepeatT=False). The image on the left shows the texture where the S axis points to the right and the T axis points up. The image on the right shows the texture applied to the geometry where the X axis points back to the right, the Y axis points back to the left, and the Z axis points up.

Side Normal Origin X Origin Y Origin Z S Axis T Axis
Side +Y 0 +Radius 0 -X (towards top point)
Bottom -Z -Radius +Radius 0 +X -Y

Figure 370 — Right circular cone textures

Attribute definitions
#AttributeTypeCardinalityDescription G
2HeightIfcPositiveLengthMeasure The distance between the base of the cone and the apex.X
3BottomRadiusIfcPositiveLengthMeasure The radius of the cone at the base.X
Inherited definitions from supertypes
Entity inheritance IfcCsgPrimitive3D IfcGeometricRepresentationItem IfcRepresentationItem
Attribute inheritance
S[0:1]Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.
IFC2x3 CHANGE  The inverse attribute LayerAssignments has been added.
IFC4 CHANGE  The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.
S[0:1]Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.
IFC2x3 CHANGE  The inverse attribute StyledByItem has been added.
1PositionIfcAxis2Placement3D The placement coordinate system to which the parameters of each individual CSG primitive apply.X
IfcDimensionCountThe space dimensionality of this geometric representation item, it is always 3. X
2HeightIfcPositiveLengthMeasure The distance between the base of the cone and the apex.X
3BottomRadiusIfcPositiveLengthMeasure The radius of the cone at the base.X
Formal representations
XML Specification
 <xs:element name="IfcRightCircularCone" type="ifc:IfcRightCircularCone" substitutionGroup="ifc:IfcCsgPrimitive3D" nillable="true"/>
 <xs:complexType name="IfcRightCircularCone">
   <xs:extension base="ifc:IfcCsgPrimitive3D">
    <xs:attribute name="Height" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
    <xs:attribute name="BottomRadius" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
EXPRESS Specification
ENTITY IfcRightCircularCone
 SUBTYPE OF (IfcCsgPrimitive3D);
  Height : IfcPositiveLengthMeasure;
  BottomRadius : IfcPositiveLengthMeasure;

Link to EXPRESS-G diagram EXPRESS-G diagram

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