Class

GKConstantNoiseSource

A procedural noise generator that outputs a field of a single constant value.

Declaration

@interface GKConstantNoiseSource : GKNoiseSource

Overview

Constant noise can be useful as an input to GKNoise methods that create noise by combining other noise objects through various operations. For example, when using the displaceXWithNoise:yWithNoise:zWithNoise: method you can pass constant noise for some parameters and non-constant noise for other parameters, resulting in a variable displacement along one axis but constant or no displacement along the others.

Figure 1

Using constant noise to constrain a noise displacement operation

Like all GKNoiseSource subclasses, a constant noise source represents a noise generation algorithm and its parameters. To make use of a noise source, first create GKNoise object from it (and optionally apply operations to that noise object or combine it with other noise objects). Then create a GKNoiseMap object from your noise object, generating a concrete field of values that you can sample from directly or visualize using the SKTexture or SKTileMap class.

Topics

Creating a Noise Source

- initWithValue:

Initializes a noise source with the specified constant value.

+ constantNoiseWithValue:

Creates a noise source with the specified constant value.

Managing Noise Generation Parameters

value

The constant value for the generated noise.

Relationships

Inherits From

See Also

Procedural Noise

GKNoiseSource

The abstract superclass for procedural noise generators.

GKNoise

A representation of procedural noise, generated by a noise source, that you can use to process, transform, or combine noise.

GKNoiseMap

A sample of procedural noise data from which you can read noise values directly or create noise textures.

GKCoherentNoiseSource

The abstract superclass for procedural noise generators that create coherent noise.

GKBillowNoiseSource

A procedural noise generator whose output is a type of fractal coherent noise with smooth features.

GKPerlinNoiseSource

A procedural noise generator whose output is a type of fractal coherent noise resembling natural phenomena such as clouds and terrain.

GKRidgedNoiseSource

A procedural noise generator whose output is a type of multifractal coherent noise with sharply defined features.

GKVoronoiNoiseSource

A procedural noise generator whose output (also called Worley noise or cellular noise) divides space into discrete cells surrounding random seed points.

GKCylindersNoiseSource

A procedural noise generator whose output is a 3D field of concentric cylindrical shells.

GKSpheresNoiseSource

A procedural noise generator whose output is a 3D field of concentric spherical shells.

GKCheckerboardNoiseSource

A procedural noise generator whose output is an alternating square pattern.