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[SOLVED] Perlin noise - smooth interpolation issues

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I don't like the result of the smooth interpolation: the linear interpolation gives straight lines and the cosine interpolation gives funny squares. Anyone came up with whatever else solution that brings a better result on the generated perlin? As I understand it, it should simply be a parabolic LERP, no? [Edited by - vracicot on June 27, 2008 6:45:34 PM]

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I’ve always used the following polynomial for interpolation (the same presented in the paper “Improving noise” by Perlin): 6t5 - 15t4 + 10t3

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Thanks to you, I discovered that I have been living under a rock for couple of years as I had never heard of improved noise before! Thanks for pointing this out.

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Took me a while but I got it working as I wanted. I found some old VB6 source code and managed it.

Source found:
http://www.vbaccelerator.com/home/VB/code/vbMedia/Algorithmic_Images/Perlin_Noise/article.asp


And screenie to show that it does work:

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