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How to control an animation using a slider but keep the animation properties.
I am a long lime user of AE but relatively new to expressions past the ‘wiggle’ control, and need a little help please.
I need to have a layer controlled by, I guess a slider, after the animation of that layer completes.
Let me explain:
I have 10 layers revealing in a fan using the Radial Wipe Transition. The initial wipe animates over 12 frames but then the ‘fan’ animates slowly for a ‘client defined’ duration. This is where I need a slider.
Layer 1 is a solid with a radial wipe transition beginning at 100% and animating to 24% over 12 frames. I need this animation to always remain. What I need the slider to do is determine what happens next. I have 10 layers to apply this to, with each layer different values.
I guess the expression would be applied to the Transition Completion to state – Clamp from 24% – say 80%. Obviously if I apply this directly to the slider, the slider controls the first part of the animation which I need to always remain the same.
Is this possible? For a layer to animate, then a slider take control?
Thanks for your help in advance.No expression code...yet... -
14 Replies
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Assuming that you’re using two keyframes for the first part of the animation, an expression for Transition Completion like this should work:
if (numKeys > 1){
if (time < key(2).time){
value;
}else{
s = effect("Slider Control")("Slider") ;
Math.max(valueAtTime(key(2).time),s);
}
}else{
value;
}
Dan
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Thanks Dan for your reply , however this is over my head….
Am I keyframing the layer with the radial wipe effect, or the slider controller? -
I think maybe what I need it the same animation (controlled by the slider) applied to every layer, but staggered by 10frames in time….
If I keyframe the slider between 2 points, how can I ‘delay’ this in time for each layer?
Thanks -
If your keyframed slider was on a null at the bottom of the layer stack, something like this should work tor the Transition Completion expressions:
f = 10; // delay frames
delay = framesToTime(f*index-1)
thisComp.layer(“Null 1”).effect(“Slider Control”)(“Slider”).valueAtTime(time-delay);Dan
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Thanks Dan.
This worked!!! with a bit of tweaking. Thanks.
My next mind bender is the code below. I just can’t figure out why it wont work.
I am attempting to control a second Radial Wipe from the first Radial Wipe inversely. As in 100=0 or 60=40 etc.
This example is applying the ‘inverse calculation but from itself, not the first “Radial Wipe”Why wont this work???
Thanks
effect("Radial Wipe")("Transition Completion");linear(value,0,100,100,0)
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Your expression picks up the value from the radial wipe, but then doesn’t use it. This would be better:
wipe = effect(“Radial Wipe”)(“Transition Completion”);
linear(wipe,0,100,100,0)or, just
100 – effect(“Radial Wipe”)(“Transition Completion”);
Dan
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Sweet, All done. Thanks for your help Dan.
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So what I have done all works, but I am struggling with a random element to put into this expression.
Expression is
wipe=effect(“Radial Wipe”)(“Transition Completion”);
linear(wipe,0,100,80,0);How am I able to randomize the ’80’ value by a variance of +- 7?
NOT over time either (wiggle), just set randomly?Thank you very much for all your help!!!
wipe=effect("Radial Wipe")("Transition Completion");
linear(wipe,0,100,80,0); -
This is one way:
seedRandom(index,true);
maxVal = 80 + random(-7,7);
wipe=effect(“Radial Wipe”)(“Transition Completion”);
linear(wipe,0,100,maxVal,0);Dan
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One again, Thank you. This worked sweet, but how does AE randomize it?
It seems to be choosing a value and never changing it.
If I wanted the random value ie -7,7 vary over time, but not wiggle, just increase over time?
You are a genius you know…
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