Perlin noise not working

[Xardov]

Hey there, i recently wrote a perlin noise class following this tutorial - http://freespace.virgin.net/hugo.elias/models/m_perlin.htm

http://pastebin.com/fnjCpTrc -- Here is my code.  However, I noticed that it doesn't produce the colours I want, and instead gives me this --> https://dl.dropbox.com/u/13907487/perlin_noise.png

Which means I obviously did something wrong.  The thing is, I don't know what I did wrong.  I'm guessing it's at image.setRGB(x,y, (int)generatePerlinNoise(x,y)) but i'm not sure how to correct it show it shows up like proper perlin noise.

[Roquen]

Skim this page: http://www.java-gaming.org/topics/noise-bandpassed-white/27071/view.html.  Then look at philfrei's tool and the link to Stefan Gustavson's java source and work from there.

[Varkas]

Aparently I was using the same or a closely related tutorial. I'm too lazy to read your code (sorry) but if you want you can compare it to my version which is working (no guarantees ...)

http://sourceforge.net/p/sunlands/code/21/tree/trunk/src/villagers/utils/PerlinNoise.java

Well you can just use mine if it's good enough for your needs. It's GPLv2.

Edit: I was testing two noise sources, one very similar to your code, and another based on an Xor-Shift RNG. Both seem to work sufficiently well. Just to explain why there are two in the code and one is unused currently.

Games published by our own members! Check 'em out!

[Roquen]

These are "value-noise" variants and using trig functions makes it crazy/insane expensive.  Move to simplex noise...I promise it's a good thing.

[matheus23]

These are "value-noise" variants and using trig functions makes it crazy/insane expensive.  Move to simplex noise...I promise it's a good thing.

Yes. Totally Agree!