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squares randomly flashing in grid

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Eugene Constable
squares randomly flashing in grid
on May 12, 2015 at 6:32:37 am

Hi,

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);
seedRandom(seed,true);
random(minVal,maxVal)

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'm new to expressions any help greatly appreciated!

Eug


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Walter Soyka
Re: squares randomly flashing in grid
on May 12, 2015 at 4:37:08 pm

I would probably approach this procedurally, with Fractal Noise, Levels/Curves/Exposure, and Mosaic.

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive [twitter]   |   RenderBreak [blog]   |   Profile [LinkedIn]


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Stephen Mendenhall
Re: squares randomly flashing in grid
on May 12, 2015 at 6:21:36 pm

The fractal noise/mosaic approach is tried and true. I usually go that route.

Recently I had a project that needed a little more control, and the Rift script saved me.


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