Value noise
Encyclopedia
Value noise is a type of noise
commonly used as a procedural texture
primitive in computer graphics. It is conceptually different, and often confused with gradient noise
examples of which are the Perlin noise
and Simplex noise
. This method consists of a creation of a lattice of points which are assigned random values. The noise function then returns the interpolated number based on the value of the neighboring lattice points.
To improve the quality of the generated noise, multiple octaves
of this noise can be generated and then summed together. This technique produces results very similar to Perlin noise
at the cost of lower quality while having a simpler algorithm.
Noise
In common use, the word noise means any unwanted sound. In both analog and digital electronics, noise is random unwanted perturbation to a wanted signal; it is called noise as a generalisation of the acoustic noise heard when listening to a weak radio transmission with significant electrical noise...
commonly used as a procedural texture
Procedural texture
A procedural texture is a computer generated image created using an algorithm intended to create a realistic representation of natural elements such as wood, marble, granite, metal, stone, and others....
primitive in computer graphics. It is conceptually different, and often confused with gradient noise
Gradient noise
Gradient noise is a type of noise commonly used as a procedural texture primitive in computer graphics. It is conceptually different, and often confused with value noise. This method consists of a creation of a lattice of random gradients, which are then interpolated to obtain values in between the...
examples of which are the Perlin noise
Perlin noise
Perlin noise is a computer-generated visual effect developed by Ken Perlin, who won an Academy Award for its use in the motion picture Tron...
and Simplex noise
Simplex noise
Simplex noise is a method for constructing an n-dimensional noise function comparable to Perlin noise but with a lower computational overhead, especially in larger dimensions...
. This method consists of a creation of a lattice of points which are assigned random values. The noise function then returns the interpolated number based on the value of the neighboring lattice points.
To improve the quality of the generated noise, multiple octaves
Octave (electronics)
In electronics, an octave is a doubling or halving of a frequency. The term is derived from the musical octave which similarly describes such frequency ratios, but the prefix octa-, denoting eight, has no significance in physics...
of this noise can be generated and then summed together. This technique produces results very similar to Perlin noise
Perlin noise
Perlin noise is a computer-generated visual effect developed by Ken Perlin, who won an Academy Award for its use in the motion picture Tron...
at the cost of lower quality while having a simpler algorithm.