Placing and undo

Press Place to close the generator and show a translucent hologram where you're looking. An upright shape faces you, with its middle-bottom block on the block under your crosshair. A flat shape lies centred on that block.

Key	Action
Enter	Place it
R	Rotate by 90°
Page Up / Page Down	Move up or down
K	Lock or unlock the position and direction. While locked, you can walk around the shape without it turning, and R still rotates it.
Backspace	Cancel
Z	Undo the last placement

You can rebind all of these under Options → Controls → Key Binds → Curve Generator.

The hologram shows up to 30,000 blocks. A bigger shape shows only its bounding box.

Permissions

Placing needs operator permissions (level 2), the same as /setblock. In singleplayer, that means cheats must be on.

• With the mod on the server (or in singleplayer), the blocks go to the server in batches and appear at once. The server checks your permissions.
• On a server without the mod, the mod falls back to /setblock commands, 40 per tick. You still need operator permissions.

Undo

Undo puts back every block the last placement changed, including blocks that Carve cleared. It doesn't restore the contents of chests or other block entities, so be careful placing over them.