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Section 3.5: Material Section Up Chapter 3: Free Format Input Subsection 3.6.1: Nodes Section

## 3.6 Mesh Section

The Mesh section contains all the mesh data, including nodal coordinates and element connectivity. It has the following sub-sections:
Nodes defines the nodal coordinates of the mesh
Elementsdefines the elements of the mesh
NodeSet defines a node set
Edge defines an edge, i.e. a set of line elements
Surface defines a surface, i.e. a set of facets
DiscreteSetdefines a set of discrete elements (e.g. springs)
ElementSet defines an element set
SurfacePairdefine a surface pair that can be used by a contact definition.
At least one Nodes must be defined and one Elements section. The other sections are optional. The NodeSet, Edge, Surface, DiscreteSet, ElementSet, and SurfacePair sections define sets of nodes, edges, facets, discrete elements, elements, and surface pairs, respectively, and can be referenced by other sections of the model file. For instsance, boundary conditions can be defined by referencing the sets to which the boundary condition will be applied.
Section 3.5: Material Section Up Chapter 3: Free Format Input Subsection 3.6.1: Nodes Section