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Position & Speed Expression
I would like to create circles at random position with certain speed. However, there’s an error that states the expression result must be of dimension 2, not 1. May I know if there’s any solution to this?
This is what I’ve typed under Expression Position:
[random (0,10885), random (0,1361)]
speed/2[random (0,10885), random (0,1361)]
speed/2 -
5 Replies
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you might try creating two random positions and have the expression animate between them… try this:
seedRandom(index, true);
p1 = random( [0, 0], [10885, 1361] );
seedRandom(index+100, true);
p2 = random( [0, 0], [10885, 1361] );
linear(time-inPoint, inPoint, outPoint, p1, p2)it will animate the layer between 2 random positions for the duration of the layer (between the layers in and out points)
Kevin Camp
Art Director
KCPQ, KZJO & KRCW -
if you’d rather use a rate (or speed/velocity), then this might work for you:
maxRate = 100; // value in pixels per second
seedRandom(index,true);
p = random( [0, 0], [10885, 1361] );
v = random( [-maxRate/2, -maxRate/2], [maxRate/2, maxRate/2] );
p + mul(v, time-inPoint)
modify the maxRate value to change the range of random velocity.Kevin Camp
Art Director
KCPQ, KZJO & KRCW -
I’ve tried both methods but it only moves on straight/diagonal directions instead of moving at random positions.
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each circle with either expression would move from one random position to another random position.
but it sounds like you want it to ‘wiggle’ as it moves?
try:
freq = 1; // samples per second
amount = 500; // value in pixels
seedRandom( index, true );
random( [0, 0], [10885, 1361] ) + wiggle( freq, amount )Kevin Camp
Art Director
KCPQ, KZJO & KRCW -
It sort of worked but the random positions went way beyond the composition size (10885px by1361px).
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