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If the selection is such that no attachments or rigid domains satisfy the rules above, the Source list in the parent node will only contain the entry None (if the parent node is a joint), or Select a connection point (if the parent node is a Spring-Damper).
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If the selection is such that some attachments or rigid domains satisfy the rules above, the None entry in the Source list in the parent node will be removed, and one of the attachments or rigid domains will be selected as default. This means that if the selection is such that the Source list has only one unique item, this item is automatically selected.
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If the selection is empty, the behavior is as if Use selection filter were not selected.
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