ISO 10303-214:2010(E)
A Centre_of_mass is the centre of the mass of a body. The relative position of the Centre_of_mass within the body is an invariant datum relative to rotation and translation. The Centre_of_mass is a characteristic of an item, not its shape.
NOTE 1 If a shape representation is present, the Centre_of_mass is usually derivable from the shape representation. However, as a characteristic of an item, it may be pre-defined in order to reflect a requirement.
NOTE 2 In order to convey the information about the actual centre of mass of a geometric model, the use of General_shape_dependent_property with value 'centroid' for its attribute 'property_type' is appropriate.
A Centre_of_mass is a type of Shape_dependent_property.
The data associated with a Centre_of_mass are the following:
The centre_point specifies a point in three-dimensional space that defines the location of a Centre_of_mass in the Cartesian_coordinate_space.
The is_defined_in specifies the Cartesian_coordinate_space in which the property is applicable.
NOTE The values of geometry related properties are specified relative to a Cartesian_coordinate_space.
EXAMPLE A Centre_of_mass may be specified in different coordinate spaces for different dimensioning applications.
See centre_of_mass to cartesian_coordinate_space for the application assertion.
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