[Dan Ebberts]

Here are two different ways:

w1 = wiggle(5,40) – value;
w2 = clamp(w1,[-40,-40],[40,0])
value + w2

w = wiggle(5,40) – value;
value + [w[0],-Math.abs(w[1])]

Either expression will keep the object from moving below its starting point. The first one clamps downward movement, the second one reflects it upward.

Dan

[Dan Ebberts]

Do you want it to just sit on the “floor” until the wiggle goes above that value, or do you want some other behavior?

Dan

[Dan Ebberts]

Do you want it to just sit on the “floor” until the wiggle goes above that value, or do you want some other behavior?

Dan

[Dan Ebberts]

If you’re saying you can’t see the light itself, that’s normal. AE lights aren’t visible unless apply Trapcode’s Lux plugin.

If you’re saying the light doesn’t cast light on anything, you have to have a 3D layer in position to receive the light an have its “Accepts Lights” switch turned on.

Other than that I don’t know what the problem could be.

Dan

[Dan Ebberts]

The only thing I can think of is if your comp is rectangular pixels and your solid is square pixels, the positions won’t match up. In that case you have to adjust the x coordinate of the lens flare like this:

p = thisComp.layer(“Light 1”).toComp([0,0,0]);
[p[0]*thisComp.pixelAspect,p[1]]

Dan

[Dan Ebberts]

You may be looking for an expression that maintains the spatial relationship of the two layers. If so, you need an expression like this for the child’s position:

p = thisComp.layer(“parent”).position;
deltaAtZero = p.valueAtTime(0) – position.valueAtTime(0);
p – deltaAtZero

Where “parent” is the name of your parent layer. Now you can move the parent layer and the child will follow, but you can independently rotate or scale the parent.

Dan

[Dan Ebberts]

You may be looking for an expression that maintains the spatial relationship of the two layers. If so, you need an expression like this for the child’s position:

p = thisComp.layer(“parent”).position;
deltaAtZero = p.valueAtTime(0) – position.valueAtTime(0);
p – deltaAtZero

Where “parent” is the name of your parent layer. Now you can move the parent layer and the child will follow, but you can independently rotate or scale the parent.

Dan

[Dan Ebberts]

Try something like this:

threshold = 10;
audio = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");

f = Math.round(time/thisComp.frameDuration);
frameCount = 0;
for (i = 0; i <= f; i++){
  if(audio.valueAtTime(i*thisComp.frameDuration) > threshold) frameCount++;
}
frameCount*thisComp.frameDuration

It will bog down if your comp is too long.

In that case you might want to consider using a script.

Dan

[Dan Ebberts]

Try something like this:

threshold = 10;
audio = thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");

f = Math.round(time/thisComp.frameDuration);
frameCount = 0;
for (i = 0; i <= f; i++){
  if(audio.valueAtTime(i*thisComp.frameDuration) > threshold) frameCount++;
}
frameCount*thisComp.frameDuration

It will bog down if your comp is too long.

In that case you might want to consider using a script.

Dan

[Dan Ebberts]

Just change your second line to:

[value[0],temp]

Dan