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  Perlin noise not working  (Read 1007 times)
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Offline Xardov

Senior Newbie

« Posted 2012-11-21 13:48:30 »

Hey there, i recently wrote a perlin noise class following this tutorial - -- Here is my code.  However, I noticed that it doesn't produce the colours I want, and instead gives me this -->

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.
Offline Roquen
« Reply #1 - Posted 2012-11-21 14:03:26 »

Skim this page:  Then look at philfrei's tool and the link to Stefan Gustavson's java source and work from there.
Offline Varkas
« Reply #2 - Posted 2012-11-21 14:37:06 »

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 ...)

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.

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Offline Roquen
« Reply #3 - Posted 2012-11-21 14:46:18 »

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.
Offline matheus23

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« Reply #4 - Posted 2012-11-21 14:50:05 »

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.

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