• Adobe After Effects Expressions

  Random Number Counter with expression slider not pass zero

  Posted by Bert Beltran on October 28, 2013 at 6:32 pm

  I have an text layer were the source text is parent to a expression slider. The expression looks like this:
  Math.round(effect(“Slider Control”)(“Slider”)). Then I added a wiggle expression to the slider control, but my issues is that the wiggle expression sometimes runs into negative numbers and I want to set the minimum value to Zero.

  I tried this expression that came close to doing what I wanted it to do but there are times it will jump to a negative number.

  Math.min=0;
  wiggle(1,50)

  Last thing how would I create an expression so that it has a max limit number as well. So that it did not pass the number 100. So it would count random numbers from 0 to 99.

  Muchos Thank You’s

  Kevin Camp replied 12 years, 6 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Kevin Camp

  October 28, 2013 at 6:44 pm

  Math.min() and Math.max() need two values (unless they assume zero as one value if only one value is present).

  so for your first expression you’d want something like this:

  w = wiggle(1,50);
  Math.max(0,w)

  you’d use Math.max() since you want it to return zero if w is less than zero.

  to values to a range (0-99), you’d use both Math.min() and Math.max(), and you can embed one inside the other:

  w = wiggle(1,50);
  Math.max(0,Math.min(99,w))

  Kevin Camp
  Senior Designer
  KCPQ, KMYQ & KRCW
• 

  Kevin Camp

  October 31, 2013 at 9:33 pm

  clamp() would also work here…

  w = wiggle(1,50);
  clamp(w,0,99)

  Kevin Camp
  Senior Designer
  KCPQ, KMYQ & KRCW

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