Talk:Perlin noise

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[edit] Common mistakes

These mistakes were found in this Wikipedia article:

1) Hugo Elias' article (http://freespace.virgin.net/hugo.elias/models/m_perlin.htm) is on VALUE NOISE, not GRADIENT NOISE (Perlin Noise is gradient noise, not value noise.)

2) Perlin Noise is not white noise. A single "layer" of Perlin noise (or value noise, or any type of noise, there are many)has only one frequency, not all of them. You much blend together many "layers" of Perlin noise to collaborate various frequencies together in one noise (known as spectral synthesis).

3) Perlin Noise is not multiple layers of noise blending together. This is a common misconception. (Even the picture of Perlin noise in this article clearly is created out of only one layer of noise.) This is a mistake commonly expressed on most websites that deal with Perlin noise, even Hugo's article (the #1 result in Google for perlin noise: http://www.google.com/search?q=perlin+noise), but anyone who has examined Ken Perlin's work, especially his original source and numerous examples, you will see no sign of spectral synthesis (adding of multiple frequency layers together). Spectral synthesis is a useful way to use Perlin noise, it is not a defining characteristic of it.

I fixed these mistakes, but perhaps did not make them clear enough.

I am going to write an article on this soon. When I do, I will update this Wikipedia page and link to my article. 24.222.121.193 15:29, 19 July 2006 (UTC)

I'd just like to offer a little encouragement on that new article. This wonderful topic is sadly neglected. 210.9.15.113 09:08, 19 October 2006 (UTC)

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another inaccuracy: The Article states perlin noise was first used in the movie Tron, but Ken Perlin's slideshow linked to from this article states that he first "started thinking" about noise while working on Tron as a way to get away from its machinelike look. —The preceding unsigned comment was added by 24.41.50.36 (talk • contribs) 17:19, 3 December 2006 (UTC).