Curves EditableSpline

Description
The Curves EditableSpline creates a freehand B-spline curve. This tool is part of the external workbench called Curves.

Usage

 * 1) Switch to the [[Image:Curves_workbench_icon.svg|24px]] Curves workbench (install from [[Image:Std_AddonMgr.svg|24px]] Addon Manager is necessary, if not previously installed).
 * 2) Optionally select vertexes, edges and/or faces:
 * 3) * The number of vertexes of the spline will match the number of selected elements.
 * 4) * The spline vertexes will be snapped to the selected vertexes, and to the midpoints of the selected edges and faces.
 * 5) To invoke the command, do one of the following:
 * 6) * Press the [[Image:Curves_EditableSpline.svg|24px]] button in the Curves toolbar.
 * 7) * Use the entry in the dropdown menu.

Options
During the command a special edit mode is active and there are several actions and behaviors that can be controlled by keys and mouse clicks.


 * To move a vertex or guide line (guide lines are the straight lines between vertexes) press and hold down the left mouse button on it, and move the mouse.
 * The key selects or deselects all vertexes and guide lines.
 * The key will add a vertex to the segment belonging to the selected guide line. The new vertex will be selected.
 * The key sets or un-sets tangent mode for the selected vertexes or guide lines (relative to the view direction).
 * The key aligns selected objects.
 * The key can be used to snap a vertex to a vertex belonging to another B-spline. With a vertex of the B-spline being edited selected, hold down the  key and add the target vertex to the selection, then hit the  key. The vertexes are snapped together.
 * To unsnap vertexes, select the snapped vertex pair and again hit the key. The vertex of the B-spline being edited remains selected and can now be moved.
 * The key sets or un-sets the linear interpolation.
 * The, or  keys can be used to constrain the movement of the object being dragged. While dragging, hit the desired axis key. Hit the same key again to disable the constraint.
 * The key finishes the command and exits edit mode.