Join

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Join

The Join command connects objects together to form a single object.

Join turns lines into polylines, curves into polycurves, surfaces and polysurfaces into polysurfaces or solids.

Join does not change the surfaces. It is merely a test to see if the surfaces edges are within 2x tolerance. If they are, then they are tagged as joined and not available for further joining.
The edge of a surface can be joined to curves.
You can join curves that touch end-to-end.
The order the objects are selected determines the layer of the new joined object.
You can join surfaces and polysurfaces that touch at naked edges.
You can join meshes that do not touch (disjoint meshes).
Joining does not change the underlying surface geometry. It simply "glues" adjacent objects together so meshing, Boolean operations, and intersections can cross seams without gaps.
To change a surface's geometry so it fills in a gap, use MatchSrf or fill the gap with a new surface created by FilletSrf, BlendSrf, BlendEdge, FilletEdge, NetworkSrf, or Patch.
To change two adjacent surfaces into a single surface, use MergeSrf. Pay special attention to the setting of the Smooth option to get the geometry you want.

Select the objects (curves, surfaces, polysurfaces, or meshes) to join.
Use SelChain to select a string of curves that touch end to end.

Select an object (curve, surface, polysurface, or mesh).
Select the next object.
To select a surface edge as a curve to join, see sub-object selection.
When you are finished selecting objects to join, press Enter.

Command-line options
Undo	The Undo option removes the last selected object from the join operation.

See also