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corgano

Noise generators?

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corgano

I've been looking around for implementations of noise generators for autoit, but as of yet have had no luck :( More particularly, I'm looking for an x octave noise generator, but I haven't found any for autoit.

Has anyone seen any x octave or perlin noise generators for autoit?


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TheDaverMan

I have backup this from the forum but it is a frequency generator.

#AutoIt3Wrapper_UseX64=n
#include "Bass.au3"

Global $nFreq = 5000 ; Hz
Global Const $pi = ATan(1) * 4

_BASS_Startup()
_BASS_Init(0, -1, 44100, 0, "")

Global $hSample = _Bass_SampleCreate(88200, 44100, 1, 1, $BASS_SAMPLE_LOOP)

Global $tSampleData = DllStructCreate("short[44100]")
Global $fTmp = $pi * 2 / (44100 / $nFreq)
For $i = 1 To 44100
DllStructSetData($tSampleData, 1, 32767 * Sin($i * $fTmp), $i)
Next
_Bass_SampleSetData($hSample, DllStructGetPtr($tSampleData))


Global $hChan = _Bass_SampleGetChannel($hSample, 0)
_BASS_ChannelSetVolume($hChan, 30)
_Bass_ChannelPlay($hChan, 0)

Sleep(5000)

_Bass_SampleStop($hSample)
_BASS_SampleFree($hSample)
_BASS_Free()

You need to download BASS UDF :

Edited by TheDaverMan

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corgano

I'm not looking for frequency noise, I'm looking for mathematical noise...

This wiki article explains it better than I could. http://en.wikipedia.org/wiki/Perlin_noise

Perlin noise generates something like this, and is used in things like photoshop to make clouds

Posted Image

Simplex octave noise generators give a somewhat similar output, but (in other languages at least) are faster, and you can configure the contrast and spacing between light and dark areas.

http://en.wikipedia.org/wiki/Simplex_noise

Also note, that some noise generators will produce the same random looking result if you give it the same input conditions. I want to use autoit to experiment with noise functions, because I don't know other languages very well. Does anyone know if either noise generator has been made?

Edited by corgano

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spudw2k

You've probably come across this link but it does contain Java code for perlin and simplex noise algos. I'm not smart enough to convert it to AutoIt though.

http://webstaff.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf

edit: forgot the link...stupid.

Edited by spudw2k

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UEZ

With pure AutoIt the calculation will be very slow!

Anyway, on German web site there was a competition creating the fastest Perlin Noise without using any 3rd party stuff.

Br,

UEZ

Edited by UEZ

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spudw2k
corgano

I figured a pure autoit functions would be slow (unless someone would crazy enough to write it in assembly inside an autoit script, trancexx :P). I was hoping a solution like the free library already had someone write a wrapper for it, but I guess none exists. Sadly, I'm only good enough to use the functions, but not enough to write a wrapper for them :(. I'll see what the german site has


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Werty

ImageMagick's "Plasma" function is a perlin noise generator.

This...

$img = ObjCreate("ImageMagickObject.MagickImage.1")
$perlin = $img.Convert("-size","256x256","plasma:fractal","-blur","0x2","-colorspace","Gray","plasma_greyscale.jpg")

..creates this...

Posted Image

Read more about it here...

www.imagemagick.org/Usage/canvas/index.html#plasma

(be sure to read further down about seeding and repeating, you can create tileable pics :) )

Also check out Fred's perlin noise script using imagemagick, for *Nix but maybe you can convert it to autoit.

http://www.fmwconcepts.com/imagemagick/perlin/index.php

Edited by Werty

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Werty

So, was it useful ? or did you miss my post ? :)

Just asking as I'm interested in it too, for a terrainmaker for IRRlicht and other 3d engines that people got working with autoit.

Dunno if you found a better solution.

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