Reference for Processing version 1.2. If you have a previous version, use the reference included with your software. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Javadoc.



float noiseVal;
float noiseScale=0.02;
void draw() {
  for(int y = 0; y < height; y++) {
    for(int x = 0; x < width/2; x++) {
      noiseVal = noise(
        (mouseX+x) * noiseScale,
        (mouseY+y) * noiseScale
        (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.
noiseDetail(octaves, falloff)
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 June 14, 2010 12:05:29pm EDT

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