Knot Type | |
Type de nœud |
Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
---|---|---|---|---|
IfcKnotType | ADDED |
The IfcKnotType indicates the particular form of b-spline knots.
NOTE Definition according to ISO/CD 10303-42:1992
This type indicates that the B-spline knots shall have a particularly simple form enabling the knots themselves to be defaulted.
NOTE Type adapted from knot_type defined in ISO 10303-42.
HISTORY New type in IFC4.
Constant | Description |
---|---|
UNIFORM_KNOTS | The form of knots appropriate for a uniform B-spline curve. |
QUASI_UNIFORM_KNOTS | The form of knots appropriate for a quasi-uniform B-spline curve. |
PIECEWISE_BEZIER_KNOTS | The form of knots appropriate for a piecewise B�?©zier curve. |
UNSPECIFIED | The type of knots is not specified. This includes the case of non uniform knots. |
<xs:simpleType name="IfcKnotType">
<xs:restriction base="xs:string">
<xs:enumeration value="uniform_knots"/>
<xs:enumeration value="quasi_uniform_knots"/>
<xs:enumeration value="piecewise_bezier_knots"/>
<xs:enumeration value="unspecified"/>
</xs:restriction>
</xs:simpleType>
TYPE IfcKnotType = ENUMERATION OF (
UNIFORM_KNOTS,
QUASI_UNIFORM_KNOTS,
PIECEWISE_BEZIER_KNOTS,
UNSPECIFIED);
END_TYPE;