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Path keyframes to Expression slider control
Hi,
I’m trying to link a set of path keyframes to an expression slider on a null layer.
Basically I have an eye shape layer. Keyframes on the path so it’s open, closed, etc.
I’d like to just use the slider on the null layer to control the eye (anywhere in the timeline)
Hope this makes sense, I saw a post about linking opacity keyframes but not sure how to link path keyframes to a slider.
Thanks for any help/suggestions!!
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4 Replies
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I’m not sure if this is exactly what you’re after, but it might give you some ideas. Apply an expression like this to your path, then as you move the slider from 0 to 100, your path will animate from its first to last keyframes.
s = thisComp.layer("Null 1").effect("Slider Control")("Slider");
if (numKeys > 1){
t0 = key(1).time;
t1 = key(numKeys).time;
t = linear(s,0,100,t0,t1);
valueAtTime(t);
}else
value
Dan
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That works Dan, not how I was thinking but it works.
Right now it morphs between the keyframes, which is very nice and could have other applications.
I was thinking the slider would just step through each keyframe from the layer.
Currently the slider values to reach each keyframe (there are 4 keyframes at the moment) are 0, 34, 64, 106. In this instance, It’d be cool if the slider just had the numbers 1, 2, 3, 4… to select the keyframes 1, 2, 3, 4… Just so it’s easier to use and if someone else has to use the rig.
But, I know beggars can’t be choosers!
Thanks a bunch Dan, I really appreciate the quick help!
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This version rounds the slider value to the nearest whole number and clamps the value between 1 and the number of keyframes. So the 1st keyframe is selected for slider values between 0 and 1.5, 2nd keyframe is selected for slider values between 1.5 and 2.5, etc.
n = Math.round(thisComp.layer(“Null 1”).effect(“Slider Control”)(“Slider”));
n = clamp(n,1,numKeys)
valueAtTime(key(n).time);Dan
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Magic! Thanks for making my animation a little easier! I really appreciate it.
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