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One Object Smoothly follow another which has Hard movement
Hi
I would like to have an expression that allows me to move object “A” Smoothly
after object “B”Object “B” has expression on position property and it moves hard (it jumps from one position to the next position)
And Object “A” have to move like a trail with 1 sec delay but smoothly without jumping.
I tried different approaches with “ease” but they all failed.
OBJECT B EXPRESSION FOR POSITIONsegMin = .2; //minimum segment duration
segMax = 2; //maximum segment duration
minVal = [10,-200];
maxVal =[0,20];end = 0;
j = 0;
while ( time >= end){
j += 1;
seedRandom(j,true);
start = end;
end += random(segMin,segMax);
}
endVal = random(minVal,maxVal)+value;
seedRandom(j-1,true);
dummy=random(); //this is a throw-away value
startVal = random(minVal,maxVal)+value;
//ease(time,start,end,startVal,endVal)// delete it -> hard move
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6 Replies
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For follower object’s position something along the lines:
samples = 10;
timeframe = .25;
delay = 1;
smooth_position = 0;
for(n = 0; n<samples;n++){
smooth_position += thisComp.layer("Object").transform.position.valueAtTime(time-delay-timeframe/2+timeframe/samples*n)}
smooth_position = smooth_position/samplesThat takes (with the current variable settings) 10 samples in the time frame of .25 seconds around the delay point of 1 second to smooth the motion. To smooth further, increase time frame (and samples). A custom smooth function, in essence.
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Thank you very very much Kalle : )
It works perfectly.But is there any opportunity to add some ease effect to the motion?
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You will get an eased animation if you add a null in between the two objects with the same expression. That is, use the expression to make the null follow the original object and then use the same (with a different target layer) to make the follower follow the null.
If you then make the settings
samples = 50
timeframe = 2
delay = 1in both, you get something so smooth it looks like a rubber band!
For a bit more in-between, natural look, try:
samples = 25
timeframe = 1
delay = 1 -
Big big Thanks again Kalle. It works. That’s exactly what I need.
But I use this settings for both(Null, and main follower):
samples =70;
timeframe = 1;
delay = .5;Thanks again.
And Happy New 2016 Year !!! -
No need to use a samples amount that is higher than your frame rate times timeframe. So if your frame rate is 25 and time frame 1, the highest you need to go is 25 for the samples. Should look exactly the same, but render faster.
Happy New Year!
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Thanks, Kalle.
It optimized my scene a lot because I have many elements with this expression.
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