ISO 10303-214:2010(E)

Figure — Arrowleft Figure — Clause 4 Figure — Arrowright

4.2.261 Geometrical_relationship

A Geometrical_relationship is the relationship between two Design_discipline_item_definition objects specifying two parts that are geometrically related. Therefore, the shape of the related parts may be represented only once and can be reused for the geometrically related situation. In this case the shape of the relating Design_discipline_item_definition is derived from the shape of the related Design_discipline_item_definition.

The two Design_discipline_item_definition objects that are related by this relationship shall belong to different Item_version objects. Other properties except shape are not subject to this relationship and therefore are not 'inherited' from the related Design_discipline_item_definition to the relating Design_discipline_item_definition.

EXAMPLE Figure 42 shows an example for a Geometrical_relationship: in this case the left mudguard of a car is symmetrical to the right mudguard. A given plane mirroring transformation specifies the location of the left mudguard regarding the location of the right mudguard.

A Geometrical_relationship is a type of Item_definition_relationship.

The data associated with a Geometrical_relationship are the following:

4.2.261.1 definition_placement

The definition_placement specifies the Geometric_model_relationship_with_transformation or the Template_instance that has the Transformation to be applied to the related Design_discipline_item_definition in order to define the location and the orientation within the context of the relating Design_discipline_item_definition . Translation, rotation, and mirroring, i.e., inversion, is included; scaling is not included. In the case of a Template_instance, the scale factor shall be omitted or set to 1.0.

See geometrical_relationship to geometric_model_relationship_with_transformation and geometrical_relationship to template_instance for the application assertions.

There shall be exactly one object that defines the definition_placement for a Geometrical_relationship.

4.2.261.2 description

The description specifies additional information about the Geometrical_relationship.

See geometrical_relationship to multi_language_string for the application assertion.

The description need not be specified for a particular Geometrical_relationship.

If present, there shall be exactly one object that defines the description for a Geometrical_relationship.



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