Prepare a Rendered VR Cubemap for Post Processing

PS Extendscript: CubeMapSplit.jsx

//Exports out the 12 images that make up cube maps into the current folder.
//Make sure you have your export setting setup correctly in PS so no hyphens are added to your filename.
//Check here: http://thesetchells.com/2012/06/preventing-dashes-hyphens-photoshop-save-web/

//Works on flattened images.

var doc = app.activeDocument;
var docName = doc.name.substr(0,doc.name.length-4);
var exportName = docName + "_split";
var dir               = doc.path.toString()+"/";
var options           = new ExportOptionsSaveForWeb();
    options.format    = SaveDocumentType.JPEG;
    options.quality   = 100;

// Set rulerUnits to pixels
app.preferences.rulerUnits = Units.PIXELS;

//Unlock layers
docLay=app.activeDocument.layers;
l=app.activeDocument.layers.length;

while (l>0) {
    l--;
    docLay[l].isBackgroundLayer = false;
    docLay[l].allLocked = false;
}

//Get Document dimensions
var w = app.activeDocument.width;
var h = app.activeDocument.height;

var CanvasCutHeight = h;
var CanvasCutWidth = (w/12);

//Shrink the canvas
doc.resizeCanvas(CanvasCutWidth, CanvasCutHeight, AnchorPosition.TOPLEFT);

var layerToSplit = doc.artLayers.getByName("Background");

//Now export out each square and offset to the next one.
for (var i = 0; i <12; i++) {
    doc.exportDocument (new File(dir + "/" + exportName + (i+1) + ".jpg"), ExportType.SAVEFORWEB, options);
         layerToSplit.applyOffset((-CanvasCutWidth), 0, OffsetUndefinedAreas.WRAPAROUND);
    }

//Reset their file back to it's original state.
history = doc.historyStates.length - 15;
doc.activeHistoryState = doc.historyStates[history];
//app.purge (PurgeTarget.HISTORYCACHES);