Defines the position from which the sub-assembly is measured.
None does not measure the sub-assembly position.
Bolt measures the position of the sub-assembly from the bolts. If bolts are not included in the sub-assembly, or if it is not possible to measure the position from bolts, Tekla Structures measures the sub-assembly position from the reference point.
Extrema points measures the position of the sub-assembly from the bounding box of the sub-assembly.
Reference point measures the position of the sub-assembly from the reference point.
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