• Adobe After Effects

  squares randomly flashing in grid

  Posted by Eugene Constable on May 12, 2015 at 6:32 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 1920×1080 comp and I have 26 squares in the the height…

  I’m new to expressions any help greatly appreciated!

  Eug

  Stephen Mendenhall replied 10 years, 11 months ago 3 Members · 2 Replies
• 2 Replies

• 

  Walter Soyka

  May 12, 2015 at 4:37 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   |   RenderBreak [blog]   |   Profile [LinkedIn]
• 

  Stephen Mendenhall

  May 12, 2015 at 6:21 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.

Reply to this Discussion! Login or Sign Up