# Magic

Music Visuals
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## RotateAxis - Random between -0.01 and 0.01

https://magicmusicvisuals.com/forums/viewtopic.php?f=2&t=2664

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### RotateAxis - Random between -0.01 and 0.01

Posted: Thu Sep 16, 2021 6:46 pm
Hi all! After searching around a bit and finding a few similar threads, I still can't seem to figure out the expression that I need to have a RotateAxis module between -.01 and 0.01.

I found this thread, but attempting to modify the expression he used has been unsuccessful: https://magicmusicvisuals.com/forums/viewtopic.php?f=2&t=2603&p=11252&hilit=random#p11252

I know that this is solved by an expression and is probably really simple, but I can't figure it out. Any assistance is very much appreciated!!

### Re: RotateAxis - Random between -0.01 and 0.01

Posted: Fri Sep 17, 2021 2:36 am
I am new to expressions.
BUT, I think this might be what you want: .01*sin(20*x)
That will sin oscillate between -.01 and .01.
Change the 20 to something smaller/larger to change the rate of oscillation.
Note: a good way to figure these out is to use this site: https://www.desmos.com/calculator
And keep typing, playing, zooming until something looks right.
(I have forgotten all my math!).
Good luck!
-James

### Re: RotateAxis - Random between -0.01 and 0.01

Posted: Fri Sep 17, 2021 7:53 pm
You don't need to use expressions though of course jameseye is correct with his.

You can use any oscillator modifier (Sine, Triangle or Ramp) which all go from 0 to 1 and back. Then scale it by 0.02 to bring it in the range 0 to 0.02. Then Offset by -0.01 to shift the values in the range -0.01 to 0.01.

### Re: RotateAxis - Random between -0.01 and 0.01

Posted: Sat Sep 18, 2021 4:20 pm
Both of you, thank you very much! I ended up using Sadler's method and it worked perfectly!!

### Re: RotateAxis - Random between -0.01 and 0.01

Posted: Fri Oct 29, 2021 4:07 pm
Hi,

I've got a lot of "random" generator of values. The expression I use is as follow (rather than offset).

1- a generator of your choosing, random, sin oss, triangle oss etc
2- (x-.5) = this will allow values to go from -.5 to +0.5
3- scale to your desired value.

Good luck in your projects!
frank

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