Photoshop Script to interleave layers for use with Lenticular Lens Sheets.

Lenticular.jsx

#target Photoshop
function makeLayerMask(maskType) {
  if( maskType == undefined) maskType = 'RvlS' ; //from selection
  //requires a selection 'RvlS'  complete mask 'RvlA' otherThanSelection 'HdSl'
    var desc140 = new ActionDescriptor();
    desc140.putClass( charIDToTypeID('Nw  '), charIDToTypeID('Chnl') );
    var ref51 = new ActionReference();
    ref51.putEnumerated( charIDToTypeID('Chnl'), charIDToTypeID('Chnl'), charIDToTypeID('Msk ') );
    desc140.putReference( charIDToTypeID('At  '), ref51 );
    desc140.putEnumerated( charIDToTypeID('Usng'), charIDToTypeID('UsrM'), charIDToTypeID(maskType) );
    executeAction( charIDToTypeID('Mk  '), desc140, DialogModes.NO );
}

// two element array of numbers for x,y start of line,   
// two element array of numbers for x,y endof line,  
//number;line width in pixels  
// uses foreground color  
function drawLine( startXY, endXY, width ) {  
    var desc = new ActionDescriptor();  
    var lineDesc = new ActionDescriptor();  
    var startDesc = new ActionDescriptor();  
    startDesc.putUnitDouble( charIDToTypeID('Hrzn'), charIDToTypeID('#Pxl'), startXY[0] );  
    startDesc.putUnitDouble( charIDToTypeID('Vrtc'), charIDToTypeID('#Pxl'), startXY[1] );  
    lineDesc.putObject( charIDToTypeID('Strt'), charIDToTypeID('Pnt '), startDesc );  
    var endDesc = new ActionDescriptor();  
    endDesc.putUnitDouble( charIDToTypeID('Hrzn'), charIDToTypeID('#Pxl'), endXY[0] );  
    endDesc.putUnitDouble( charIDToTypeID('Vrtc'), charIDToTypeID('#Pxl'), endXY[1] );  
    lineDesc.putObject( charIDToTypeID('End '), charIDToTypeID('Pnt '), endDesc );  
    lineDesc.putUnitDouble( charIDToTypeID('Wdth'), charIDToTypeID('#Pxl'), width );  
    desc.putObject( charIDToTypeID('Shp '), charIDToTypeID('Ln  '), lineDesc );  
    if (width != Math.floor(width)) desc.putBoolean( charIDToTypeID('AntA'), true );  
    executeAction( charIDToTypeID('Draw'), desc, DialogModes.NO );  
};

function main() {
    var doc = app.activeDocument;
    var numLayers = doc.artLayers.length;
    var visLayers = 0;
    for (var i = 0; i < numLayers; i++) doc.artLayers[i].visible && visLayers++;
    var res = doc.resolution;
    var lensLPI = Number(prompt("Lenticular Sheet LPI?","40","Lines Per Inch Value"));
    var lineThickness = res * (1.0/lensLPI) * (1.0/visLayers);
    if (lineThickness != Math.floor(lineThickness)) {
        lineThickness = Math.ceil(lineThickness);
        var idealRes = 1.0 / ((1.0/lineThickness) * (1.0/lensLPI) * (1.0/visLayers));
        app.activeDocument.resizeImage(undefined,undefined,idealRes,ResampleMethod.BICUBIC);
    }


    preferences.rulerUnits = Units.PIXELS;
    var j = 0;
    for (var i = 0; i < numLayers; i++) {
        var layer = doc.artLayers[i];
        if (layer.visible) {
            app.activeDocument.activeLayer = layer;
            $.writeln(app.activeDocument.activeLayer.name);
            var bounds = layer.bounds;
            activeDocument.selection.selectAll();
            makeLayerMask('HdSl');
            app.foregroundColor.rgb.red = 255;
            app.foregroundColor.rgb.green = 255;
            app.foregroundColor.rgb.blue = 255;
            for (var y=j*lineThickness; y<bounds[3]; y+= visLayers*lineThickness) {
                drawLine( [0,y], [bounds[2],y], lineThickness );
                // break;
            }
            j++;
        }
        //  break;
    }
}

var originalRulerUnits = preferences.rulerUnits;
preferences.rulerUnits = Units.INCHES;

main();

preferences.rulerUnits = originalRulerUnits;

Love it. Beautiful. Thank you so much!
Just getting into Lenticular photography, looking forward to testing this out with some photos and some plastic sheets I just ordered.