Definition from ISO/CD 10303-41:1992: The shape aspect is an identifiable element of the shape of a product.
Definition from buildingSMART: The IfcShapeAspect allows for grouping of shape representation items that represent aspects (or components) of the shape of a product. Thereby shape representations of components of the product shape represent a distinctive part to a product that can be explicitly addressed.
NOTE: The definition of this class relates to the STEP entity shape_aspect. Please refer to ISO/IS 10303-41:1994 for the final definition of the formal standard.
HISTORY: New Entity in IFC Release 2.0
|ShapeRepresentations||:|| List of
IFC2x Edition 3 CHANGE The data type has been changed from IfcShapeRepresentation to IfcShapeModel with upward compatibility
|Name||:||The word or group of words by which the shape aspect is known. It is a tag to indicate the particular semantic of a component within the product definition shape, used to provide meaning. Example: use the tag "Glazing" to define which component of a window shape defines the glazing area.|
|Description||:||The word or group of words that characterize the shape aspect. It can be used to add additional meaning to the name of the aspect.|
|ProductDefinitional||:|| An indication that the shape aspect is on the physical boundary of the product definition shape. If the
value of this attribute is TRUE, it shall be asserted that the shape aspect being identified is on such
a boundary. If the value is FALSE, it shall be asserted that the shape aspect being identified is not
on such a boundary. If the value is UNKNOWN, it shall be asserted that it is not known whether or not
the shape aspect being identified is on such a boundary.
EXAMPLE: Would be FALSE for a center line, identified as shape aspect; would be TRUE for a cantilever.
|PartOfProductDefinitionShape||:||Reference to the product definition shape of which this class is an aspect.|