186 lines
7.9 KiB
Groff
186 lines
7.9 KiB
Groff
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<span class="tagline">a port of the Processing Visualization Language</span>
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<table cellpadding="0" cellspacing="0" border="0" class="ref-item">
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<tr class="name-row">
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<th scope="row">Name</th>
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<td><h3>noiseDetail()</h3></td>
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</tr>
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<tr class="">
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<th scope="row">Examples</th>
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<td><div class="example"><pre class="">float noiseVal;
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float noiseScale=0.02;
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void draw() {
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for(int y = 0; y < height; y++) {
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for(int x = 0; x < width/2; x++) {
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noiseDetail(3,0.5);
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noiseVal = noise(
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(mouseX+x) * noiseScale,
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(mouseY+y) * noiseScale
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);
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stroke(noiseVal*255);
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point(x,y);
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noiseDetail(8,0.65);
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noiseVal=noise(
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(mouseX + x + width/2) * noiseScale,
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(mouseY + y) * noiseScale
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);
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stroke(noiseVal * 255);
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point(x + width/2, y);
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}
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}
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}</pre></div></td>
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</tr>
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<tr class="">
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<th scope="row">Description</th>
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<td><p>Adjusts the character and level of detail produced by the Perlin noise function. Similar to harmonics in physics,
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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
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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,
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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
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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
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in greater than 1.0 values returned by <b>noise()</b>.</p>
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<p>By changing these parameters, the signal created by the <b>noise()</b> function can be adapted to fit very specific needs and characteristics.</p></td>
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</tr>
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<tr class="">
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<th scope="row">Syntax</th>
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<td><pre>noiseDetail(<kbd>octaves</kbd>);</pre><br />
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<pre>noiseDetail(<kbd>octaves</kbd>,<kbd>falloff</kbd>);</pre></td>
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</tr>
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<tr class="">
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<th scope="row">Parameters</th>
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<td><table cellpadding="0" cellspacing="0" border="0">
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<tr class="">
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<th scope="row">octaves</th>
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<td>int: number of octaves to be used by the noise() function</td>
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</tr>
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<tr class="">
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<th scope="row">falloff</th>
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<td>float: falloff factor for each octave</td>
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</tr>
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</table></td>
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</tr>
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<tr class="">
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<th scope="row">Usage</th>
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<td>Web & Application</td>
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</tr>
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<tr class="">
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<th scope="row">Related</th>
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<td><a href="noise_.1">noise() </a><br /></td>
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<p>This reference is licensed under the CC BY-NC-SA 2.0 license:</p>
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Processing is an open visualization language developed by
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and originally ported to Javascript by
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