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Random position and fad in fade out with in grid - expression?

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Eugene ConstableRandom position and fad in fade out with in grid - expression?
by on May 11, 2015 at 10:24:28 am


I have a grid of dark grey squares on black.

I need the grid to gradually come to life, as if being 'powered =up' by colured squares that randomly flash around the screen.

trying to avoid doing this manually.

I found this expression:

holdTime = .5; //time to hold each position (seconds)
minVal = [0.1*thisComp.width, 0.1*thisComp.height];
maxVal = [0.9*thisComp.width, 0.9*thisComp.height];
seed = Math.floor(time/holdTime);

sort of works for the random pos, but I need the squares to only appear randomly within the grid x and y spacing and also flash on and off. If it helps it a 1920x1080 comp and I have 26 squares in the the height...

I also need to increase the amount of 'pulsing' squares that are appear over time. this animation is 5s long max.

I'm new to expressions any help greatly appreciated!


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