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MouseOK   Menu: Draw – сплайн Spline

MouseOK   Toolbar: Draw – сплайн

KeyboardOK Command line: SPL, SPLINE

A spline is a smooth curve passing through a given set of points. Example of spline usage: line breaks of objects.

Spline can be created by two methods:

Fit points

When creating splines using fit points, the resulting curve goes through the specified points and depends on intervals between mathematic knots of curve.

Control vertices

When creating splines using control vertices, temporary lines are displayed between the specified points, they form control polygon that defines the spline form.


Command options:


Selects the method of creation [Fit/Control]


Converts a polyline, smoothed by the Spline and Smooth commands, to an equivalent spline.


Closes a spline.

Fit tolerance

The maximum distance from a spline curve to any points defining it.


Successively reverses the specified points. It is impossible to undo the specified start point.

Creating splines by fit points method

MouseOK    Ribbon: Main – Draw >  Fit points

MouseOK    Menu: Draw – Spline >  Fit points

MouseOK    Toolbar: Draw –  Fit points

KeyboardOK Command line: SPL, SPLINE – Method > Fit


Command prompts:

Current settings:



Specify first point or [Method/Object]:

Specify a start point 1.

Specify second point:

Specify second point 2.

Specify next point [Fit tolerance/Undo] <start tangent>

Specify 3, 4, 5 etc. points.

Specify next point or [Close/Fit tolerance/Undo] <start tangent>

Press ENTER to finish specifying points.

Specify start tangent:

Specify a tangent 6 for the start spline point.

Specify end tangent:

Specify a tangent 7 for the end spline point.

Creating splines by control vertices method

MouseOK    Ribbon: Main – Draw >  Control vertices

MouseOK    Manu: Draw – Spline >  Control vertices

MouseOK    Toolbar: Draw –  Control vertices

KeyboardOK Command line: SPL, SPLINE – Method > Control

Command prompts:

Current settings: Method=Cv


Specify first point or [Method/Object]:

Specify the spline start point.

Specify second point:

Specify the second point.

Specify next point or [Undo]:

Specify the next point.

Specify next point or [Close/Undo]:

Specify all next points. Press ENTER to close the command.

Converting objects to spline

Lines, polylines, spline-smoothed polylines, arcs, circles, elliptical arcs can be transformed into a spline.

Specify first point or [Method/Object]: Object

Select the Object option.

Select objects to convert to splines or [?]:

Select objects.


Press ENTER to complete the command.


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