Region outline editor
Orthographic, one screen pixel per block at 1:1. Every coordinate is a whole block.
Mouse
drag
Pan the map
wheel
Zoom about the cursor
click
Add a vertex at the end
drag vertex
Move it
right-click vertex
Delete it
click midpoint
Insert a vertex in that edge
middle-drag
Pan (works over vertices too)
click minimap
Jump there
Keyboard
Ctrl+Z
Undo
Ctrl+Shift+Z
Redo
Ctrl+S
Save the outline
Backspace
Remove the last vertex
Delete
Delete the selected vertex
← ↑ → ↓
Nudge selected vertex 1 block
Shift+arrows
Nudge 16 blocks
Tab
Select the next vertex
Esc
Deselect / close this
+ −
Zoom
F
Fit the selected region
Home
Fit the whole world
R
Relief shading
G
Block & chunk grid
O
Other regions
L
Region names
V
Overlap highlighting
B
Bounding boxes
Shift while placing
Constrain to axis / 45°
Two things worth knowing.
A vertex sits at the centre of its block, because that is what the server
tests against — an outline point (x, z) behaves as (x+0.5, z+0.5).
Zoom in far enough and you can see the edge pass through block centres, not corners.
An outline narrows a region's bounding box, it does not replace it. Any part of a
shape drawn outside the box has no effect, so the editor warns when that happens.
Your work is kept in this browser as you draw. A failed save never discards the shape —
fix the problem and save again, or press Copy JSON and keep it by hand.