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Gravity w/ Markers
Hi All,
I’m looking for a way to simulate gravity turning on. After a few seconds of animation, where objects float in zero-g, all the sudden gravity is introduced and the objects fall off the screen. I tried keyframing this but I can’t figure out the velocity of the objects. I would imagine that this can be accomplished by linking gravity properties to markers or map them to time. Any ideas?
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6 Replies
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Give this a try:
g = 1000; // gravitational constant
if (marker.numKeys > 0 && time > marker.key(1).time){
t = time – marker.key(1).time;
y = g*t*t/2;
value + [0,y]
}else{
value
}Dan
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Thanks Dan! Does the trick as usual.
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I’m trying to accomplish a similar effect but I put this expression in my position layer and it’s not working, does it need a dummy control layer or a slider control? How do I control when the gravity effect occurs?
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Just put a layer marker wherever you want it to start falling.
Dan
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Sorry, it’s still not working. Let me review; alt click on stopwatch in static text layer, paste expression, click on keyframe marker. Preview and nothing happens. What am I missing?
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Got it! First time using expressions triggered by markers, thought it was triggered by a keyframe. Thanks for your help.
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