# Node definition

 This section describes the methods for defining nodes in an Abaqus input file. In a preprocessor such as Abaqus/CAE, you define the model geometry rather than the nodes and elements; when you mesh the geometry, the preprocessor automatically creates the nodes and elements needed for analysis. Although the concepts discussed in this section apply in general to the node definitions in the input file that is created by Abaqus/CAE, the methods and techniques described here apply only if you are creating the input file manually. Node definition consists of: assigning a node number to the node; optionally specifying a local coordinate system in which to define nodes; defining individual nodes by specifying their coordinates; grouping nodes into node sets; creating nodes from existing nodes by generating them incrementally, by copying existing nodes, or by filling in nodes between the bounds of a region; and mapping a set of nodes from one coordinate system to another. If any node is specified more than once, the last specification given is used. Abaqus will eliminate all unnecessary nodes before proceeding with the analysis. This feature is useful because it allows points to be defined as nodes for mesh generation purposes only. The following topics are discussed:
 Related Topics In Other Guides *NCOPY *NFILL *NGEN *NMAP *NODE *NSET *SYSTEM

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