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Reference for Processing version 1.0.1+. If you have a previous version, use the reference included with your software. If you see any errors or have any comments, let us know.

Name

### noiseDetail()

Examples

    float noiseVal;
    float noiseScale=0.02;
    void draw() {
      for(int y = 0; y < height; y++) {
        for(int x = 0; x < width/2; x++) {
          noiseDetail(3,0.5);
          noiseVal = noise(
            (mouseX+x) * noiseScale,
            (mouseY+y) * noiseScale
          );
          stroke(noiseVal*255);
          point(x,y);
          noiseDetail(8,0.65);
          noiseVal=noise(
            (mouseX + x + width/2) * noiseScale,
            (mouseY + y) * noiseScale
          );
          stroke(noiseVal * 255);
          point(x + width/2, y);
        }
      }
    }

Description

Adjusts the character and level of detail produced by the Perlin noise function. Similar to harmonics in physics, noise is computed over several octaves. Lower octaves contribute more to the output signal and as such define the overal intensity of the noise, whereas higher octaves create finer grained details in the noise sequence. By default, noise is computed over 4 octaves with each octave contributing exactly half than its predecessor, starting at 50% strength for the 1st octave. This falloff amount can be changed by adding an additional function parameter. Eg. a falloff factor of 0.75 means each octave will now have 75% impact (25% less) of the previous lower octave. Any value between 0.0 and 1.0 is valid, however note that values greater than 0.5 might result in greater than 1.0 values returned by noise().
By changing these parameters, the signal created by the noise() function can be adapted to fit very specific needs and characteristics.

Syntax

    noiseDetail(octaves)
    noiseDetail(octaves, falloff)

Parameters

octaves | int: number of octaves to be used by the noise() function
falloff | float: falloff factor for each octave

Usage | Web & Application
Related | noise()

Updated on November 22, 2008 08:39:25pm PST