control freq of random

[sky]

Hi

Is there a way control frequency of random function ?

for any random function, rand, noise, snoise()..

Thanks

[crunch]

Hi

Is there a way control frequency of random function ?

for any random function, rand, noise, snoise()..

Thanks

If I understand this, the way to do this would be to have a PDF (Probability Density Function), then use the rand() function to lookup a value in the PDF. This would allow you to get gaussian distributions or other distributions out of the rand() function.

If you're actually talking about spatial frequency, then I think the rand() function is un-correlated. In effect, the random() function has infinite frequency (white noise), so there's no way to change this.

If you're looking for something like the prman cellnoise() function, you should be able to simply take the floor of the sample, giving you an integer lattice. Then you can control the frequency of the integer lattice by scaling the sample.

[Marc]

If you have an expression that looks like this : sturb($TX,$TY,$TZ,1) then all you need to do is multiply the internal values by an arbitrary number to increase the frequency.

So the format is : sturb(freq X, freq Y, freq Z, depth).

So sturb($TX*2, $TY*2, $TZ*2,1) will increase the frequency of the turbulent noise by 2.

This applies to turb(), noise() and snoise() too. And like crunch said, there is no way to affect the output of rand() (as far as I know anyway)....

Cheers

Marc

[sky]

Thanks crunch, Marc

It help me to understand noise.

Cheers