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Glow intensity tied to audio amplitude
I’m trying to attach the glow intensity of a layer in a Comp called “Tunnel” to the Audio Amplitude of a comp called “Rush”. This is what I have so far:
d = thisComp.layer(“glow”).comp(“Rush”).layer(“Audio Amplitude”).effect(“Right Channel”)(“Slider”);
minScale = [.1];
maxScale = [2];
dAtMinScale = .1;
dAtMaxScale = 2;linear(d,dAtMaxScale, dAtMinScale, maxScale, minScale)
However, this only sets the glow intensity to the max value, it won’t fluctuate based on the audio amplitude properties in the other comp. It must be something simple I’m missing, but I can’t get it. Also, I don’t know if I even totally understand this expression. As far as I understand it means d is between 2 and .1 (based on the datminscale/datmaxscale part) and then they are connected in a linear way. However, I don’t quite know what the minscale and maxscale parts are defining. If anyone could clear that up for me and help me with why this isn’t working that’d be great. Thanks for any help.
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3 Replies
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This should work better for you:
d = comp(“Rush”).layer(“Audio Amplitude”).effect(“Right Channel”)(“Slider”);
minGlow = 0;
maxGlow = 5;
dAtMinGlow = 0;
dAtMaxGlow = 15;linear(d,dAtMinGlow, dAtMaxGlow, minGlow, maxGlow)
You should just need to set the parameters for the min and max glow, and the audio levels that correspond to the glow levels. All linear() does is convert the range of audio levels to the correponding range of glow intensities.
Dan
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Ah great. Thanks for explaining that. One more thing, and this might be much more tough than I want it to be. Say I wanted this expression to work but start from 10 seconds into the rush comp (as opposed to at the beginning). How would I offset the start time like that?
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You could do it like this:
if (time >= 10){
d = comp(“Rush”).layer(“Audio Amplitude”).effect(“Right Channel”)(“Slider”);
minGlow = 0;
maxGlow = 5;
dAtMinGlow = 0;
dAtMaxGlow = 15;
linear(d,dAtMinGlow, dAtMaxGlow, minGlow, maxGlow)
}else{
value
}Dan
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