• Adobe After Effects Expressions

  Waveforms

  Posted by Sam Vargas on February 21, 2007 at 10:08 am

  Hi,
  I found that wiggle always gives me random waveform, even with octaves=1. What if I want the value to follow a simple sine or square waveform in all the comp, and I don’t want to go over and make hundreds of keyframes ? Are there a simple expression to make simple waveforms like wiggle but not random ?

  Mylenium replied 19 years, 2 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Mylenium

  February 21, 2007 at 10:43 am

  Octaves do not refer to the number of waveforms, but to the number of overlapping waveform groups (at least 3 per group), so it never would work. To get a simple sine wave, use the according function:

  Math.sin(time)*multiplier

  Mylenium

  [Pour Myl
• 

  Sam Vargas

  February 21, 2007 at 10:50 am

  Thanks. To be honest I tried the sin() function, but it wasn’t work. But now I found out that other functions need the …(?)… so that math prefix (i’m not a programmer, i don’t know what that’s name 🙂 ) I assume that’s apply for other java functions as well, if I get the function not declared or similar error message. thank you.
• 

  Mylenium

  February 21, 2007 at 7:07 pm

  Math.() is a class in Java. A class by itself is simply a specially defined sub-set of the language that are used a lot can be replaced or expanded with your own classes. In case of math that makes sense – nobody wants to calculate pi and radians manually. Modifying the math class could also be used to control how precise computations are for instance. However, with AE that’s a very theoretical scenario, as it is no full JavaScript/ ECMA script environment with all the bells and whistles. ;o)

  Mylenium

  [Pour Myl

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