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run expression every 2 frames.. every 3 frames etc?
I have a very simple expression for the position prop that makes a layer jump around:
x = random(500, -500);
y = random(500, -500);
position + [x,y];This makes my layer jump around every frame really fast… i’d like the expression make my layer change positions more slowly, say, every 3 frames or 5 frames… is there a way i can have AE run the expression only once every 3 or 5 frames? If not is there an alternate method? I don’t think wiggle will work because this will “wiggle” the position… and i need “jumpy” or “blinky” movement… thanks
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9 Replies
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probability = 3; r = (random(-probability+2,1)); //determines how often it wiggles, -4,1= 1/6th of the time with a clamp of 0,1 v = clamp(r,0,1); s = wiggle(10, 400*v); x = value[0]; y = s[1]; [x,y]
You can define variable probability using random and a clamp, heres an example that i did using text not to long ago…this code only wiggles on the Y.
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…sorry, it copied weird…the 2nd and 3rd line shown there is actually all on one line.
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probability = 3; r = (random(-probability+2,1)); v = clamp(r,0,1): s = random(500,-500; x = s[0]; y = s[1]; position + [x,y]
here is the code you would use pertaining to your project…let me know how it works
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Something like this should make it change every three frames:
period = 3; // frames
posterizeTime(1/(period*thisComp.frameDuration));
x = random(500, -500);
y = random(500, -500);
position + [x,y];Dan
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Like this maybe:
period = 3; // frames
f = timeToFrames();
seg = Math.floor(f/period);
interp = time – framesToTime(seg*period);seedRandom(seg-1,true);
prev = random([-500,-500],[500,500]);
seedRandom(seg,true);
next = random([-500,-500],[500,500]);
value + linear(interp,0,framesToTime(period),prev,next)Dan
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I’ve been tweaking this expression to set opacity to 100 every 20th frame and then fade out again, repetively. It’s all working as I want exept that I can’t for the life of me get it to start the loop at the text layers inPoint. Anyone got an idea of how to achieve that?
period = 20;f = timeToFrames();
seg = Math.floor(f/period);
interp = time - framesToTime(seg*period);minVal = 0;
maxVal = 100;linear(interp,0,framesToTime(period),maxVal,minVal)
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One way:
period = framesToTime(20);
t = (time-inPoint)%period;
minVal = 0;
maxVal = 100;
linear(t,0,period,maxVal,minVal)Dan
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Flawless! Thank you so much Dan 🙂
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