# Perpendicular Linedef Mode

NEW IN UNOFFICIAL 2.10!
Perpendiculars are created alongside each linedef.
This mode is helpful for:
• Creating track segments. (Due to float inaccuracies you need to use "Snap distance")
• Placing things parallel to a path.
This mode shows a small dialog window that you can use to create a perpendicular linedef, vertex or thing from a linedef or multiple linedefs. Although this mode shows a dialog window, you can still use the main interface and zoom/move your view around the map.
This mode is volatile, which means that this mode returns to the previous stable mode when the map is saved or closed, either accepting or discarding your preview changes. You can access this mode through the Vertices Mode, Linedefs Mode or Sectors Mode but is recommended to access from Linedefs Mode.
WARNING!
• Perpendiculars are only created on selected vertices with 1 or 2 selected linedefs connected! (aka. a path line)

## Dialog Settings

Create as... | Select which type of elements to create, see below for more information.
Distance | Set distance between selected linedef(s) and the end of the perpendicular.
Offset % | Sets offset along each linedef of where the perpendicular should intersect. 50% means exactly in the center.
Backwards | When checked, it creates a perpendicular on the opposite side of where the linedefs are facing.
Snap distance | Adjust snap distance to vertices that already exist in the map so perpendiculars get connected to them. Set to zero to disable snapping.

## "Create as..." types

Linked Linedef | Creates a normal perpendicular linedef.
Unlinked Linedef | Creates an isolated perpendicular linedef that won't intersect or merge into elements on the map. Not recommended.
Vertices | Creates a vertex at the end of the perpendicular.
Vertices with Linedef Split | Creates a vertex at the end of the perpendicular and split the linedef on same offset.
Thing | Creates a thing at the end of the perpendicular.

## Default Controls

Enter | Accept and apply the changes, and return to the previous mode.
Escape | Discard the changes and return to the previous mode.