Region Noise

Name	Type	Description
マスク mask	Image	領域を生成する範囲を制限する任意の画像マスクです。マスクは明度 * アルファ >= 0.5 のピクセルを有効範囲として扱います。マスク外は OUTSIDE_ID になります。

Name	Type	Description
領域 regions	RegionMap	生成された RegionMap データです
プレビュー preview	Image	生成した領域を色分けした確認用画像です
ラベル labels	Map	Inspector に重ねるIDラベル位置です

Parameters

Name	Type	Default	Range	Description / Options
幅 width	Int	64	1–2048	RegionMap のピクセル幅です
高さ height	Int	64	1–2048	RegionMap のピクセル高さです
方式 mode	Enum	Smooth	—	領域値を作るノイズ方式です滑らか`Smooth` 雲や地形のような滑らかなムラを作ります白色`White` 補間しないブロック状のランダム領域を作りますリッジ`Ridged` 滑らかノイズを折り返して筋状の段差を作ります
段階数 levels	Int	5	2–64	ノイズ値を何段階の領域IDへ分けるかです
シード seed	Int	1	0–99999	ノイズ生成を再現するためのシードです
スケール scale	Float	16	1–512 / step 1	大きいほど、荒く大きな領域になります
オクターブ octaves	Int	3	1–8	重ねる細かさの段数です
減衰 persistence	Float	0.5	0.1–0.95 / step 0.01	各オクターブの強さをどれだけ減衰させるかです
コントラスト contrast	Float	1	0.25–4 / step 0.05	段階化する前のノイズ値の強弱です
左右ループ wrap_x	Bool	false	—	左右に繰り返しやすいノイズとして生成します
上下ループ wrap_y	Bool	false	—	上下に繰り返しやすいノイズとして生成します
ID順 id_order	Enum	SeedOrder	—	生成した領域IDの並べ替え方法です段階順`SeedOrder` ノイズ値の低い段階から順番にIDを割り当てます面積昇順`AreaAsc` 面積が小さい領域から小さいIDを割り当てます面積降順`AreaDesc` 面積が大きい領域から小さいIDを割り当てます
ID表示 show_ids	Bool	false	—	Inspector のプレビュー上に領域IDラベルを表示します

Overview

Divides noise values into discrete levels and turns them into regions. It produces natural variation like a height map separated by contour levels, making a good base for organic surfaces such as terrain, water, rock, and grime.

Category: Generate / Region / Create
Use cases: create natural surface variation for rock, terrain, water, grime, grass, and abstract backgrounds

Usage tips

The go-to terrain recipe is region_noise(levels=4–6) → region_fill, which can color height-based levels such as deep water, shallow water, beach, and grassland in one pass.
scale determines the coarseness of the shapes: large values are continental, while small values produce fine mottling. Choose the scale first, then adjust levels to reduce guesswork.
Ridged creates streaked or ridge-shaped levels suited to rock walls and wood-like surfaces.
The same level ID may appear as several separate islands by design. Add region_split_islands downstream when each island needs its own ID.

Related nodes

region_fill — assign colors to levels
region_split_islands — separate IDs by island
region_merge_small — clean up small noise islands
region_cells / region_voronoi / region_strata — alternative generators
noise_generate — generate noise as an image

Modes

Value	Description
`Smooth`	Interpolated value noise, suited to smooth variation such as clouds and terrain.
`White`	Uninterpolated block noise, suited to coarse random patches.
`Ridged`	Folds smooth noise to create streaked or ridge-like levels.

ID ordering

Value	Description
`SeedOrder`	Assigns IDs in order from lower noise-value levels.
`AreaAsc`	Assigns lower IDs starting with smaller regions.
`AreaDesc`	Assigns lower IDs starting with larger regions.

How to use

Create natural level regions with Region Noise, then assign colors with Region Fill. Add Region Split Islands downstream to handle small islands separately, or Region Merge Small to blend small patches into their surroundings.

Because levels is the number of value levels, the same ID may occur in several distant places. To give every visible island a separate ID, add Region Split Islands downstream.

Enabling wrap_x / wrap_y generates noise designed to loop and preserves the loop information in the output RegionMap.

When mask is connected, noise regions are generated only inside the active mask area and the outside is treated as OUTSIDE. Pixels where lightness * alpha >= 0.5 are active. An arbitrary mask shape takes priority, so wrap_x / wrap_y are disabled in the output while a mask is connected.

Region Noise is a generator for converting natural tonal variation into region IDs, not for specifying shapes in detail. Use Region Cells for ready-to-edit surfaces, Region Voronoi for point-like distributions, or Region Bands / Region Strata for directional surfaces.

Input Ports

Output Ports