-
Controlling frequency of” 0 or 100 opacity” expression
Hello folks,
I’ve been noddling different approaches to achieving this and can’t seem to get it right.I have multiple layers. I’d like their opacity to randomly flicker on/off so 0/100 (nothing in between)
Thats easy enough using:
Math.round(random())*100
Now I would like to ramp up the frequency of the on state by time (so at 0 seconds have everything be off, 1 second 20% is flickering on, 2 seconds 50% is on, etc.).
I’d love to do this with a slider whereas I could set a nice curve to the ramp. Any insight would be greatly appreciated. Thank you.
-
6 Replies
-
Something like this maybe:
s = effect(“Slider Control”)(“Slider”).value;
random(100) < s ? 100 : 0Dan
-
Dan that works exactly as I requested. Problem is it gave me a seizure. I’m wondering if there is a way to do this same effect using the wiggle expression. So if I had a wiggle with both frequency and amount controlled by a slider with an or/else function to always deliver either 0 or 100?
-
Now you’re venturing into much more complex territory:
https://www.motionscript.com/articles/speed-control.html#wiggle
Dan
-
I’ve been trying really really hard to avoid reading that. It also gives me seizures. But I have the time today to try and learn so here goes.
I’ve also got a 1/2 way decent shortcut working using this workaround:
https://lesterbanks.com/2012/02/creating-an-on-off-expression-in-after-effects/
Thanks Dan you the man.
-
You should be fine as long as you don’t try and animate the wiggle frequency.
Dan
-
So the effect I was going for was to have multiple layers slowly begin to blink ON (0 or 100 opacity no in between), then I wanted the ON state to increase in frequency finally having them all hold ON after 5 seconds.
Ok so I’m no Dan Ebberts. Legend. But this is what I came up with and it works and gives me some control. It’s a basic wiggle expression with an if/else function tied to 3 slide controllers.
code:
freq = thisComp.layer(“slider”).effect(“frequency”)(“Slider”)
amp = thisComp.layer(“slider”).effect(“amount”)(“Slider”)
control = thisComp.layer(“slider”).effect(“control”)(“Slider”)if (wiggle(freq, amp) + control < 1) { 0 } else 100
Reply to this Discussion! Login or Sign Up