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Consider the following structure: If you select [P1.1, P1, P2], you will be able to select a first geometry belonging to P1 (geometry can belong to P1.1 or not) or P2, and a second geometry under P3. The transformation computed to snap the first geometry on the second geometry will then be applied to P1 only, highest father of the sub-set [P1, P1.1] and P2. This ensures that the set of components selected as inputs to the Cumulative Snap command will be kept as a rigid block along the definition of multiple constraints, which is a condition to the definition of a consistent constraints environment. |