Noise Tweaker*

Introduction
Key Features
Parameters
Quick Recipes

Noise Tweaker is the ultimate "signal shaping" utility. While noise generators produce raw data, Noise Tweaker refines that data into usable textures. It modulates scalar values through a sequential pipeline of transforms including contrast, power curves (bias), ridge generation, posterization, and coverage-based masking. It is the essential bridge between a raw noise node and a material input, perfect for sculpting terrain heightfields, defining cloud density maps, or creating stylized artistic patterns.

Performance Cost 🟢 Low

Signal Type Float → Float

Implementation Native Compiled C++

Devices (Cycles) CPU / GPU (1:1)

Usage & Behavior

Alligator noise with Tweaker in Rigged mode

With high bias and low coverage fro Gyroid

Ctrl BW conversion for ie. rough maps

Quantize a Folding noise

Think of this node as a "curve editor" or "levels adjustment" for your noise. Instead of chaining multiple Math nodes (Power, Multiply, Add, Greater Than), Noise Tweaker performs all these operations in a single, optimized, CUDA-safe function. It is particularly useful for creating Masks (using Coverage) or Terrain (using Ridged and Bias).

Best Used For: Creating opacity masks, terrain heightmaps, sharpening fuzzy noise, creating distinct bands (posterization), and inverting signals.

Key Features

Sequential Pipeline: Applies transforms in a logical, non-destructive order.
Geometric Shaping: Instantly converts billowy noise into sharp ridges or bands.
Value Remapping: Precision control over falloff (Bias) and dynamic range (Contrast).

Parameters

Noise Input Float

The scalar noise value to be processed.

Ridged (bool, default: false)

Inverts the absolute value of the signal: 1.0 - abs(2x - 1). This turns smooth hills into sharp, creased mountain peaks.

Turbulence (bool, default: false)

Applies a banding function that breaks the noise into distinct zones (0.1, 0.3, 0.6). Useful for creating complex, discontinuous islands from smooth gradients.

Clamp (bool, default: true)

Ensures the output stays strictly within the 0.0 to 1.0 range, clipping any values pushed outside by high contrast.

Invert (bool, default: false)

Flips the final result (1.0 - Output).

Coverage (default: 1.0)

Controls the "fill" of the noise. Lowering this value acts like a flood fill or a water level rising, masking out the lower values of the noise.

Transition (default: 0.1)

Works with Coverage. Controls the softness of the masked edge.
- 0.0: Hard, binary clip.
- High values: Smooth gradient fade.

Contrast (default: 1.0)

Expands or compresses values around the 0.5 midpoint. Higher values make brights brighter and darks darker.

Bias (default: 1.0)

Applies a power curve (Gamma).
- Values > 1.0: Pushes midtones towards black (slimmer peaks).
- Values < 1.0: Pushes midtones towards white (fatter peaks).

Quantize (default: 0.0)

Posterizes the output into discrete steps.
- 0.0: Disabled (Smooth).
- Values > 0: The number of steps (e.g., 4.0 creates 4 distinct levels).

Quick Recipes

Essential setups for shaping noise.

Terrain Height

Ridged: True
Bias: 2.0
Contrast: 1.2
Quantize: 0.0

Ridged creates the peaks; high Bias sharpens them into steep mountains.

Cloud Mask

Coverage: 0.6
Transition: 0.4
Contrast: 1.0
Invert: False

Lowering coverage hides the thin wisps; high transition keeps the cloud edges soft and fluffy.

Cel/Toon Steps

Quantize: 4.0
Contrast: 1.5
Clamp: True

Forces the smooth noise gradient into 4 distinct flat color bands.

Technical Note: The node applies operations in a specific mathematical sequence to ensure predictable results:
Ridged → Bias (Power) → Contrast → Clamp → Quantize → Coverage (Masking) → Invert.

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