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Scale expression needed… Please help!
Hi all,
Before I start I will say a big thank you in advance to any help on this thread. I am very new to expressions and really struggle with the concept and formula.
What I require is an expression that will facilitate the look of something landing after dropping and sort of squeezing down before popping up to proper height.
I am animating a static image that will `fall` into the frame onto the ground. Hope I have made sense.
I looked at Dan Ebberts site, got scared, cried a bit, tried the squash & stretch https://www.motionscript.com/expressions-lab-ae65/squash-and-stretch.html but it seemed to be stretching and squashing as it fell and not when it got the the floor. Any ideas as to what I am doubtlessly doing wrong?
Ta all
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3 Replies
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PS: which factors do I need to tweak to control the amount of stretch/bounce and time on this script?
Ta in advance again
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The simplest thing to do might be to change the expression to begin at the first layer marker. Just drop a marker where the object hits the ground and use this scale expression:
maxDev = 13; // max deviation in pixels
spd = 30; //speed of oscillation
decay = 1.0; //how fast it slows downif (marker.numKeys > 0){
t = time – marker.key(1).time;
if (t >=0 ){
x = scale[0] + maxDev*Math.sin(spd*t)/Math.exp(decay*t);
y = scale[0]*scale[1]/x;
[x,y]
}else{
value
}
}else{
value
}maxDev controls the amount of stretch
spd controls how fast it oscillates
decay controls how fast it stops oscillatingDan
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Hell Fire, a response from the man himself. thanks I will try it in a while and let you know
😉salutations from codemonkey
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