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simple opacity expression
i’m looking for an expression where I change the opacity of an object from 0-100 over a set amount of time..
for example
from 0-10 seconds.. i want “x” amount of keyframes to make an object appear and disappear… rather than creating keyframes..
basically making an object blink..
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1 Reply
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Hey bryanisfishing
I played around with the sinus funktion and I found this little line to help you with your problem
Math.sin((time*0.31415915) *5 )*1000000;
The sinus funktion makes the value of the opacity go up and down
the variable time is the timeline variable that feeds the sinus funktion with a continous value
the strange number 0.31415915 is actually there to calibrate the blinking to almost exactly 10seconds. (correct for more than 1hour)
the *5 is the “x” value that you would want to change to set the blinking to your needs
it goes like this
10seconds / x = blinking timeso here it would be 10/5 = 2 so every 2 seconds the layer changes the opacity from 0 to 100
the *1000000 is used so that the blinking isn’t fading.
I hope I could help you
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