Is there a way to make Animate automatically do that ? (like a macro)

Hi.

Here is a script that does what you need.

Probably k will give you a most efficient way of doing this, but, for now, I think it can help you.

Feel free to improve it in any way desired.

UPDATE (03/23/2023):

I didn't review the code. Just grabbed it from another folder I have in Google Drive.

var defaultValue = "3";
var space = prompt("Type the pyramid edge width.", defaultValue);
var doc = fl.getDocumentDOM();
var timeline = fl.getDocumentDOM().getTimeline();
var selectedLayers = timeline.getSelectedLayers();
var count;
var increment;

function start()
{
	if (!doc || !selectedLayers || selectedLayers.length == 1 || space == null)
		return;
	else
	{
		space = space.replace(/\s/g,'');
		
		if (isNaN(parseFloat(space)) || space <= 0)
			return;
		else
			count = Number(space);
		
		increment = count;
	}
	
	for (var i = selectedLayers.length - 1; i >= 0; i--)
	{	
		timeline.setSelectedLayers(selectedLayers[i], true);		
		timeline.insertFrames(count, false, 0);		
		timeline.insertKeyframe(count - (increment - 1));
		count += increment;
	}
}

start();

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JSFL download: layers_pyramid.jsfl - Google Drive

Usage:

Select the layers you want, type in the value of the pyramid's edges or leave the default and press 'OK'.

Code (for reference):

var defaultValue = "3";

var space = prompt("Type the pyramid edge width.", defaultValue);

var doc = fl.getDocumentDOM();

var timeline = fl.getDocumentDOM().getTimeline();

var selectedLayers = timeline.getSelectedLayers();

var count;

var increment;

function start()

{

    if (!doc || !selectedLayers || selectedLayers.length == 1 || space == null)

        return;

    else

    {

        space = space.replace(/\s/g,'');

        if (isNaN(parseFloat(space)) || space <= 0)

            return;

        else

            count = Number(space);

        increment = count;

    }

    for (var i = selectedLayers.length - 1; i >= 0; i--)

    {   

        timeline.setSelectedLayers(selectedLayers, true);       

        timeline.insertFrames(count, false, 0);       

        timeline.insertKeyframe(count - (increment - 1));

        count += increment;

    }   

}

start();

Demonstration:

I hope it helps.

Regards,

JC