IfcDimensionCount
Definition from ISO/CD 10303-42:1992: A dimension count is a
positive integer used to define the coordinate space dimensionality.
Definition from buildingSMART: The IfcDimensionCount is restricted
to have the dimensionality of either 1, 2, or 3 - the WR1 had been added as an
addition to the STEP P42 entity dimension_count. In contrary to the STEP P42
constraint, that all geometric representation items within a geometric
representation context are forced to have the same dimension count, the IFC
geometry allows mixed dimensions, particularly when defining the boundary of
planar surfaces.
NOTE Corresponding STEP type:
dimension_count, please refer to ISO/IS 10303-42:1994, p. 14 for the final
definition of the formal standard.
HISTORY New Type in IFC Release
1.5
EXPRESS specification:
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| TYPE IfcDimensionCount = INTEGER;
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Formal Propositions:
| WR1
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:
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The dimension count should be an integer between 1 and 3 NOTE: This is a further constraint by IFC, the
upper limit does not exist in STEP.
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