This mode lets you manage the 3D floors in Hexen format and UDMF
Menu path: Mode -> 3D Floor Mode
Action category: 3D Floor Plugin.
Default key: None.
The Control Sector Area
Upon entering the 3D floor mode you will see a green square:

This is the control sector area (CSA). All 3D floor control sectors will be created in this area.
If there is not enough space in the CSA you will not be able to create more 3D floors.
Modifying The Control Sector Area
You can resize and move the CSA. Resizing is done by simply dragging the edges or corners by holding
the right mouse button. Moving is done by pointing the cursor inside the CSA and then drag it around
by holding the right mouse button.
Tag Ranges
You can define a range of tags that should be used for the 3D floor control sectors. This is done by
pointing the cursor inside the CSA and then pressing the right mouse button. This will open the
following dialog:

To set a range of tags to use first check the
Use tag range checkbox and then set the desired
first and last tag.
Note: if you run out of tags you will not be able to create more 3D floors.
Managing 3D Floors
3D floor mode works similar to sectors mode. You can select and deselect sectors, but when you edit
them (default: right mouse button) the 3D floor editing dialog will show up:

To add a new 3D floor press either one of the *Add 3D floor* buttons. After doing so a widget will be
shown in the window that lets you set the properties of the 3D floor. The green bar on the left side
indicates that this 3D floor was newly added.
Note: you can have many 3D floors in the same sectors. Just keep pressing the
Add 3D floor button.

On the left side you can set bottom (control sector floor) height and texture, the border texture and
the top (control sector ceiling) height and texture of the 3D floor. The border height, or thickness,
is calculated automatically.
In the center let's you set commonly used properties, like the type and flags of the 3D floor, as well
as it's alpha and the brightness
below the 3D floor. It also shows the tags of the control sector,
as well as a button to edit the all properties of the control sector.
On the right a list of sectors is displayed. This list indicates which sectors this 3D floor is
applied to. Currently selected sectors are shown at the top, currently not selected sectors at the
bottom, grayed out. You can check or uncheck the selected sectors to apply or remove a 3D floor
from this sector.
On the very right are several buttons to speed up common workflows:
Using The Docker
The plugin comes with a docker for the 3D floor editing mode. Make sure the dockers are always
expanded by pressing the

icon at the top of the docker if necessary. The docker will be selected by default when entering the
3D floor editing mode.
When highlighting a sector the docker will show basic information about the 3D floors in this sector:

You can use the
cycle highlighted 3D floor up (default: Shift+ScrollUp) and
cycle highlighted
3D floor down (default: Shift+ScrollDown) actions to cycle through the 3D floors in the docker.
A green bar on the left side will indicate which 3D floor is highlighted. All sectors the highlighted
3D floor is applied to will be shown with a green tint.

You can use the
Select 3D floor control sector action (default: Shift+S) to select the control
sector of the highlighted 3D floor. This is useful if you want to apply a slope to this 3D floor.