Specifications

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The Join tool is streamlined to automatically combine selected objects using typical selection methods
such as crossing or picking objects in any order. You are no longer required to select the source object
first.
Spline Enhancements
Splines have been updated in AutoCAD 2012 to support periodic splines. When you specify the Close
option for a spline, a periodic spline with C2 continuity between the start and endpoints is generated and
the new Periodic property is listed in the Properties window. Periodic behavior is also supported when
rebuilding closed NURBS surfaces. When converting an analytical surface to a NURBS surface, a
periodic NURBS surface is created if the end conditions of the surface allow for it.
AutoCAD 2012 provides more flexible and intuitive behavior with greater control when grip-editing fit
points of splines. In addition, the knot parameterization property of the spline, which is displayed in the
Properties palette when the method is set to Fit, has changed from a read-only text field to a drop-down
list where you can specify chord, square root, or uniform knot parameterization. Changing the knot
parameterization value is often useful when switching from editing the control vertices of the spline to
editing the Fit points of the spline. It provides greater control over the shape of the spline as it passes
through the Fit points.
The Kink option has been added to the Splinedit tool when selecting a Fit Points spline.
The Extend tool is enhanced to support splines when selecting objects to extend. The spline is extended
while maintaining a curvature that is continuous with the original spline.