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Even though SCIA Engineer knows the entity "node" and uses it for various purposes (mainly related to the definition of structure model), nodes themselves are not defined as separate and self-standing entities. A new node can only be defined as an integral part of a new 1D member. It is not possible to define an independent and self-standing node.
On the other hand, it is possible that, thanks to various geometric manipulations, some nodes become self-standing. This may occur after a node looses its relation to the 1D member, for example due to the deletion of the 1D member. Such nodes are called free nodes and have no specific purpose in the project. Therefore, SCIA Engineer offers tools for their removal (see chapter Deleting the nodes).