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Expressions: Alternating between 2 values
Hey y’all. So I have this lightning bolt, and I need it to go from 100% opacity to 0% opacity to create flickering. What is a good expression to alternate between these values?? I’m using a random expression so that I can control the timing of it, so I just need a way to clamp the values to 0 and 100.
Also, I’m using seedRandom to make it switch values every second:
seedRandom(Math.floor(time), true);
But how do I get it on the half second?
This is basic stuff I know but I can never remember expressions…
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1 Reply
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Here is an old expression from Dan Ebberts
minOnTime = .5;
maxOnTime = 2.0;
minOffTime = .5;
maxOffTime = 1.5;i = 0;
tEnd = 0;
seedRandom(index,true);preRun = random(maxOnTime);
while (time + preRun >= tEnd){
i++;
if(i%2){
tEnd += random(minOnTime,maxOnTime);
result = 100;
}else{
tEnd += random(minOffTime,maxOffTime);
result = 0;
}
}
result
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