Combines a series of finite linear and open curved objects at their common endpoints to create a single 2D or 3D object. The type of object that results depends on the types of objects selected, the type of object selected first, and whether the objects are coplanar. 

Construction lines, rays, and closed objects cannot be joined. 

Select Source Object or Multiple Objects to Join at Once: 

Select lines, polyline, 3D polylines, arcs, elliptical arcs, helixes, or splines. 

Line

Only line objects can be joined to the source line. The line objects must all be collinear, but can have gaps between them. 

Polyline

Lines, polylines, and arcs can be joined to the source polyline. All objects must be contiguous and coplanar. The resulting object is a single polyline. 

3D Polyline

Any linear or curved object can be joined to the source 3D polyline. All the objects must be contiguous, but can be non-coplanar. The resulting object is either a single 3D polyline or a single spline, depending on whether you are joining to a linear or a curved object respectively. 

Arc

Only arcs can be joined to the source arc. All the arc objects must have the same radius and center point, but can have gaps between them. The arcs are joined in a counterclockwise direction starting from the source arc. 

The close option converts the source arc into a circle. 

Elliptical Arc

Only elliptical arcs can be joined to the source elliptical arc. The elliptical arcs must be coplanar and have the same major and minor axes, but can have gaps between them. The elliptical arcs are joined counterclockwise starting from the source elliptical arc. 

The Close option converts the source elliptical arc into an ellipse. 

Helix

Any linear or curved object can be joined to the source helix. All objects must be contiguous, but can be non-coplanar. The resulting object is a single spline. 

Spline

Any linear or curved object can be joined to the source spline. All objects must be contiguous, but can be non-coplanar. The resulting object is a single spline. 

1. A line object results from joining collinear lines. The lines can have gaps between their endpoints. 
   
2. An arc or circle object results from joining coplanar arcs with the same center point and radius. The arcs can have gaps between their endpoints. Lengthening occurs in a counterclockwise direction. A circle object results if the joined arcs form a complete circle. 
   
3. A spline object results from joining splines, elliptical arcs, or helixes together, or to other objects. The objects can be non-coplanar. 
   
4. A polyline object results from joining coplanar lines, arcs, polylines, or 3D polylines. 
   
5. A 3D polyline results from joining non-coplanar objects other than curved objects. 
   

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