Perlin Noise
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Perlin Noise
1–10 of 15 posts
Re: Perlin Noise
#2This is just a simplistic description of Perlin Noise. However while implementing the algorithm this is not the way to go. Because it's very very slow -- the author has simply taken non-coherent noise and smoothened it and this is computationally very expensive.
And also Ken Perlin has made an improved version to his original with some speedups and a reference implementation in Java can be found here: http://mrl.nyu.edu/~perlin/noise/
Re: Perlin Noise
#3This is just a simplistic description of Perlin Noise. However while implementing the algorithm this is not the way to go. Because it's very very slow -- the author has simply taken non-coherent noise and smoothened it and this is computationally very expensive. And also Ken Perlin has made an improved version to his original with some speedups and a reference implementation in Java can be found here: http://mrl.nyu.…
Where are the permutation numbers derived from?
Re: Perlin Noise
#4I wrote a Python extension based on the original Ken Perlin's algorithm. Just found it on my hard drive and uploaded it to github: http://github.com/ii/perlin
Re: Perlin Noise
#5This is just a simplistic description of Perlin Noise. However while implementing the algorithm this is not the way to go. Because it's very very slow -- the author has simply taken non-coherent noise and smoothened it and this is computationally very expensive. And also Ken Perlin has made an improved version to his original with some speedups and a reference implementation in Java can be found here: http://mrl.nyu.…
"... I first started to think seriously about procedural textures when I was working on TRON at MAGI in Elmsford, NY, in 1981. ..." ~ http://www.noisemachine.com/talk1/4.html
there is another site Perlin has explaining how, "Making Noise" ~ http://www.noisemachine.com/talk1/
Re: Perlin Noise
#6This is just a simplistic description of Perlin Noise. However while implementing the algorithm this is not the way to go. Because it's very very slow -- the author has simply taken non-coherent noise and smoothened it and this is computationally very expensive. And also Ken Perlin has made an improved version to his original with some speedups and a reference implementation in Java can be found here: http://mrl.nyu.…
Where are the permutation numbers derived from?
They are generated randomly. Ken Perlin has described it in his book Texturing, Modeling A Procedural Approach. If I remember correctly the numbers have to be such that every direction should have an equal chance. Even distribution I think.
Re: Perlin Noise
#7I've implemented 2D perlin noise for my final year project, but I think it has mistakes in it. Never got the time to verify. If anybody wants to take a look it's here: http://trac.assembla.com/terrainium/browser/TerrainiumLatest...
perlinNoise() is the function to look at. I implemented it based on http://web.archive.org/web/20070706003038/http://www.cs.cmu.... but the images are missing in the web archive :(
Re: Perlin Noise
#8Earlier quoted context omitted.
Where are the permutation numbers derived from?
They are generated randomly. Ken Perlin has described it in his book Texturing, Modeling A Procedural Approach. If I remember correctly the numbers have to be such that every direction should have an equal chance. Even distribution I think.
I was thinking it would be more like the fast inverse square from Quake. If it's random, using the same code could be a problem, no?
Re: Perlin Noise
#9[deleted]
Re: Perlin Noise
#10Ken Perlin is one of the best computer science professors at NYU. Take a class of his if you get the chance.