**fuse_nset

Description

This command joins nodes forming a “mini-union” algorithm, or can also be used to “clean up” a mesh with possible gaps in nodes. This is very useful when batch mesher transforms are applied to an initially exploded arrangement of sub-meshes, which are then to be transformed together and glued. It is also an effective method to make cracks (in the absence of using **crack_2d).

Syntax

**fuse_nset \(~\,\) [ *nset1 nset-name ] \(~\,\) [ *nset2 nset-name ] \(~\,\) [ *cleanup_nset nset ] \(~\,\) [ *cleanup_mesh ] \(~\,\) [ *tolerance tol ] \(~\,\) [ *relative ] \(~\,\) [ *exclude_nset excluded_nset ] \(~\,\) [ *average_locations ] \(~\,\) [ *allow_mixed_fuse ] \(~\,\) [ *keep_orphans ] \(~\,\) [ *iterate ] \(~\,\) [ *debug ] \(~\,\) [ *debug_nset_name ]

*nset1

when not running in *cleanup_mesh mode, this specifies the name of one of the two node sets which will be compared. It is required for standard use.

*nset2

enter the node set name to be compared with nset1.

*cleanup_nset

cleanup only the nodes of a given nset. It must be used jointly with *cleanup_mesh.

*cleanup_mesh

this changes the mode of operation to a “clean up” mode, where all nodes closer than the tolerance are joined.

*tolerance

enter a real value for the magnitude of distance between nodes at or below which they will be considered the same (its default value is that of the global parameter Mesher.MeshFusion).

*relative

Relative tolerance with respect to the size of the mesh zone in which the nodes are merged.

*exclude_nset

exclude a nset from the clean-up.

*average_locations

this indicates that the new node position for joined nodes is in the middle of their original positions. By default the node position in node set one is taken.

*allow_mixed_fuse

fuse nodes of different dimension.

*keep_orphans

A flag to keep orphan nodes (by default orphan nodes are removed).

*iterate

To iterate the fusion process until no node can be merged.

*debug

create a new nset (the default name is debug_nset. The name can also be specified using *debug_nset_name name) which shows the nodes that have been fused (only the remaining ones). Useful to see what would happen is fuse_nset were not called. You can for instance make a fake call to fuse_nset with the cleanup_mesh option to see where nodes are doubled.