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Clock escapement with expressions
I’m rapidly going around in circles (as is my cog that I am trying to animate). I want to animate, using expressions, the motion of an escapement mechanism. So I have a pendulum motion which rocks between -5 & +5 degrees. The point at which I want the wheel to move is between -1 and +1 degrees. Each time the pendulum falls in this range I want the wheel to free rotate 20 degrees, then stop until the return journey of the pendulum, then move another 20 degrees and so. So in short I am looking to trigger, move a bit, hold previous value, move a bit, hold etc. I can get the trigger and free rotate working, but not the holding of previous value.
Declan Smith
https://www.madpanic.tv
After Effects CS5.5/ FCS3 / Canon 7D / Canon XL2 / Reason / Cubase“it’s either binary or it’s not”
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1 Reply
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I’ve solved it. Not sure what I was doing wrong by after walking away and having a large strong coffee, the world righted itself. One of the other issues I was facing was not supply radians to Math.sin which gave me a bit of a headache as well.
The multiplier for time is 40 as I have two movements per second each of 20 degrees.
pangle=effect("PendulumSwing")("Angle");
mtime=time * 40;
if ( pangle >=-1 & pangle <=1 ) {
mtime;
} else {
Math.round((mtime)/20)*20;
}Declan Smith
https://www.madpanic.tv
After Effects CS5.5/ FCS3 / Canon 7D / Canon XL2 / Reason / Cubase“it’s either binary or it’s not”
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