Blendulate

shortcut CTRL + B in edit curve mode

The Blendulate tool is used to create, edit or undo a curve radius or non-circular blend between two curve segments.
It's like a Bevel tool and MESHmachine's Refuse and Unf*ck tools, all in one, and for POLY curves instead of meshes.

Selection

single point, and multiple continuous points

• a single POLY spline point
• multiple, continuously selected POLY spline points, without any gaps in between
• and as of version 1.5 - multiple such selection islands at once
• the spline of the selected points should be active
• the active spline's end points can only be selected if the spline is cyclic

Statusbar

The statusbar at the bottom of Blender - after invoking the tool - provides all the info you need in regards to what keys you can press to modify the tool's behavior.

Using Blendulate

• Dragging the mouse horizontally adjusts the Width of the blend
  • You can drag to the left until the blend is Auto-Merged to a single point
  • Holding down SHIFT allows for more fine-grained control
  • Holding down CTRL allows to quickly make bigger changes
• Using A you can toggle Auto-Tension, which will approximate a circular arc
  • this will only work if the curve segments at the end of the blend actually converge to a single point though
• Holding T allows you to manually adjust the Tension by moving the mouse vertically
• Scrolling the mouse wheel or using the 1 and 2 keys changes the blend's segment count
• You can use M or hold ALT when confirming to Merge without using mouse movement
• Use Q to toggle between Selection Island and Per Point blendulation modes

Multi-Island Blendulating

Blendulate can handle multiple corners at once, or re-blendulate multiple selection islands in a single operation.
Detection of what to blend is automatic - Selection Islands vs Per Point - but you can toggle between those with Q if the guess is wrong.

Multi-Island Blendulating