1 Correct answer
Sorry, missed a line when I pasted:
var moveAllAttributes = true;
var laycol = app.project.activeItem.layers;
// first cache the array of layer selections, starting at the bottom
var selectedLayers = new Array();
for (var i=laycol.length; i>0; i--) {
var thislayer = laycol;
if (thislayer.selected) selectedLayers.push(i);
}
// now precompose them individually
for (var s=0; s<selectedLayers.length; s++) {
var thislayer = laycol[selectedLayers];
var precomp_name = thislayer.name;
laycol.prec
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Replies
If they want random wiggles for every layer and the wiggle is in the nested comp then they will have to add a way to randomize the random seed in each of the nested comps. The nested comps have one layer so the random seed is going to be the same for each layer.
Personally, I think the OP is overcomplicating the project by about 243 nested comps.
A simple if statement linked to a slider or a checkbox could easily make 243 layers randomize opacity and then stop when the slider or checkbox is keyframed. You could also use a time calculation or a marker or the in or out point of a layer to control when the wiggle stops working.
For example:
if (thisComp.layer("Control").effect("Random Checkbox")("Checkbox") == 1) {100}
else
wiggle(3, 60)
or if you want to gradually slow down the wiggle:
freq = effect("Slider Control")("Slider");
if (freq > 0)
{wiggle(freq, 60)}
else 100
If the layers were all shape layers then you could do the entire thing with onje layer:
With a little help from Dan Ebberts, I figured out a universal expression that can be saved as an animation preset. You can put all of your triangles in a single shape layer then draw a path on a new shape layer that lines up with the center points of each triangle in the order you want to wipe them on. Make the stroke wide enough to make sure that you are covering about 1/4 of the triangle. Now drag the path below the shape layer that is filled with triangles.
The next step is to drag a selection around all of the triangles in the timeline, then apply the animation preset. You apply this expression to the Opacity of Transform Polygon 1>Opacity:
target = thisComp.layer(index + 1);
CP = [thisComp.width/2, thisComp.height/2] + thisProperty.propertyGroup(1)(2);
alpha = target.sampleImage(CP, [.5, .5])[3] / 1;
if (alpha == 1) {wiggle(10, 30)}
else alpha * 100
Here's what the expression does. The first line defines the target layer, the one that you are going to sanple the alpha channel from as the layer directly below the current layer. The second line figures the comp space position of the triangle by adding the Transform Triangle 1 position to half the comp width and comp height. This will give you a point you use to sample the layer below.
Here's the animation preset: Dropbox - Random Opacity via trim path.ffx
The next line (alpha 😃 uses sampleImage to look at the target layer, then divides that value by 1. All that is left is to add an if statement that says if the alpha channel is equal to 1 (maximum value for the alpha channel [3]) then wiggle the opacity 10 times a second between 0 and 30. If the alpha does not equal 1 then multiply the alpha value by 100 to set the opacity of the layer. You can set the wiggle to anything you like. You could even tie it to a pair of sliders.
If you add trim paths to the target layer's path and animate the start you can turn off each triangle as the start point is animated. Adding a blur will fade out the triangle as the line passes instead of just shutting it off.
All you have to do is save the expression as an animation preset or copy the expression only, then drag a selection around all of the triangles on your shape layer and apply the Animation Preset or Paste.
Everything you wanted to do on a single layer. It should also render very quickly. I hope this makes sense. Here's a sample comp I made by just duplicating triangles and dragging them into position:
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