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Mutiple Random Masks
I have a premade image of colored squares and circles that make up a large grid (circles and squares are all the same size) and I need to animate them ON and OFF so they look as if they’re growing and then shrinking back to nothing. Similar to a wall of lights turning on and off randomly. I’ve tried a few options with hand doing masks, but the image has too MANY “squares” and doing masks for each would take forever! Anyone have a good trick to reveal a grid and make it feel random?
Thanks!
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3 Replies
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You could try a scale expression like this:
rampTime = .1;
holdTime = .1;
minDelay = .5;
maxDelay = 1.5;seedRandom(index,true);
preRun = random(maxDelay);
accum = 0;
temp = 0;while (time + preRun > accum){
temp = random(minDelay,maxDelay);
accum += temp;
}
accum -= temp;
t = time – accum + preRun;if (t < rampTime){ linear(t,0,rampTime,[0,0],[100,100]); }else if (t < rampTime + holdTime){ [100,100]; }else if (t < 2*rampTime + holdTime){ linear(t, rampTime + holdTime, 2*rampTime + holdTime,[100,100],[0,0]); }else{ [0,0]; } Adjust the first four parameters to get the look you want. Dan
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dang! I should have mentioned I’m expression-illiterate. I’ve done a few in the past with the great help from this board. Maybe again.
if you have a tip on how to add this to this example below, I may be able to experiment. If I get one section to work, I’m sure I can duplicate or repeat to work on a larger document:
Lets say If I have a 300×300 doc that is divided into 9 masks/section (100×100). and I wanted to animate each mask randomly. how would I use these expressions you gave me? one each mask?
any additional help is greatly appriciated!
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Sorry, I misunderstood. I assumed each section was a seperate layer, in which case you’d just apply the expression to each layer’s scale property. It won’t work that way for masked sections of the same layer.
Dan
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