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Expression to read Marker from any Null layer – is this possible.
Is it possible to read the Marker time from any Null layer regardless of the layers name.
Essentially I’d like to have a control layer which will iterate through every layer within a comp and if the layer has a marker on it it will trigger an expression, much the same as the ‘Opacity Flash – layer markers’ preset but for any layer which has a marker.
I don’t want to have to point the expression to a specific layer or multiple layers, the only condition required it the layer(s) have markers.
I imagine the starting point for this would be a ‘For Loop’ but I’m not sure.
Many thanks in advance…
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3 Replies
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Probably something close to this:
tMin = null;
for ( i = 1; i <= thisComp.numLayers; i++){
if (i == index) continue;
m = thisComp.layer(i).marker;
if (m.numKeys == 0) continue;
n = m.nearestKey(time).index;
if (time < m.key(n).time) n--;
if (n > 0){
t = time - m.key(n).time;
if (tMin == null){
tMin = t;
}else{
tMin = Math.min(tMin,t);
}
}
}
tMin == null ? 0 : tMin -
I forgot to mention, as-is, you could use this to drive a time-remapped animation. If you wanted to use it to drive some other animated property, you’d probably want to change the last line to:
valueAtTime(tMin == null ? 0 : tMin)
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Amazing, thanks Dan. Works like a charm.
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