Selection Operations

Selection operations modify the active selection or the blocks within it. They are accessible from the Selection and Operations windows.

Selection Shape Operations

These operations change which blocks are selected without touching the world.

Operation	Description
Clear	Deselect all blocks
Expand	Add one layer of blocks outward on all faces
Shrink	Remove one layer of blocks inward on all faces
Bounding Box	Replace the selection with the axis-aligned bounding box of the current selection
Convex Hull	Replace the selection with the convex hull of the current selection
Filter	Remove blocks from the selection by block type
Distort	Displace the selection boundary using 3D noise
Smooth	Smooth the selection boundary

Filter

Scans the selected blocks and presents all unique block types as an icon grid. Check or uncheck types, then apply to keep or remove those types from the selection.

Option	Description
Keep matching	Keep the checked types; remove the rest
Exact meta	Match block metadata exactly (uncheck to match any meta variant)

Distort

Displaces the selection boundary with Perlin noise, producing organic irregular edges.

Parameter	Description
Scale	Noise frequency — higher values produce finer, more chaotic distortion (1–100)
Distance X/Y/Z	Maximum displacement per axis in blocks (0–20)
Randomize Seed	Generate a new random seed for a different noise pattern

Smooth

Rounds the selection boundary by expanding and contracting based on neighbour density.

Parameter	Description
Strength	Number of smoothing passes (1–8)
Threshold	Minimum neighbour fill fraction for a block to be included (0.01–1.0) — lower = more inclusive

Block Operations

These operations write to the world. All require an active selection.

Operation	Where
Delete (erase to air)	Operations window
Fill (fill with active block)	Operations window
Fill… (modal, choose block + mode)	Operations window
Fill Nearest	Operations window
Replace	Operations window
Type Replace	Operations window
Hollow	Operations window
Fill Gaps	Operations window
Drain	Operations window
Simulate Gravity	Operations window
Trigger Updates	Operations window

Opens a dialog to pick a block and a fill mode.

Mode	Description
Fill	Fill every selected block
Outline	Fill only blocks that have at least one face-adjacent block outside the selection
Walls	Fill only the vertical perimeter (north/south/east/west outline, excluding top/bottom)
Top	Fill only the topmost layer of the selection
Bottom	Fill only the bottommost layer of the selection

Replace

Replace one specific block with another throughout the selection.

Option	Description
Find	Block to search for
Replace with	Block to place instead
Exact meta	When checked, only matches the exact metadata variant

Supports multiple find→replace mappings in a single operation.

Type Replace

Replace all instances of a block type with another block, optionally preserving existing metadata.

Option	Description
Source	Block type to replace
Target	Block type to place
Preserve meta	When checked, keeps the original block’s metadata instead of using the target’s metadata

Supports multiple source→target mappings.

Hollow

Removes interior blocks, leaving only the outer shell (surface blocks with at least one air or liquid neighbour).

Fill Gaps

Fills air blocks that are fully surrounded by solid blocks on all 6 faces.

Drain

Replaces all liquid blocks in the selection with air.

Simulate Gravity

Drops all non-air blocks in the selection downward until they rest on a solid block, simulating gravity.

Trigger Updates

Forces a block update event on every block in the selection. Useful for activating redstone, flowing liquids, or updating connected blocks after a bulk edit.