How to control an animation using a slider but keep the animation properties.

[Dan Ebberts]

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

[John Pritchett]

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?

[John Pritchett]

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

[Dan Ebberts]

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

[John Pritchett]

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)


[Dan Ebberts]

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

[John Pritchett]

Sweet, All done. Thanks for your help Dan.

[John Pritchett]

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);

[Dan Ebberts]

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

[John Pritchett]

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…