{
	// Create3DComp.jsx
	// Written by Jim George on 6/3/2008 
	// Contact me at backsmith@gmail.com
	// Created for DXARTS 545: Stereoscopic Cinema Spring 2008
	// 
	// Feel free to use, modify, and redistribute
	// Limitations: does not support keyframed mask shapes.  Shape layers may mess things up.
	/**
	Below are instructions on how to integrate this into your work flow 
	Footage Requirements:
		* You need all your footage to be named with the convention MyVideoClipLEFT.mov and MyVideoClipRIGHT.mov and for them to be in the same folder
		* Your files should be captured with synced time code so they're in/out points are the same and they are the same duration
		* Make sure the word LEFT and RIGHT doesn't show up anywhere else in the file names too ;) 
	To Use the script:
		* Create a composition that is 1440x1080 with Pixel aspect of HDV 1080 (1.33) (this is a default setting in after effects for HDV 29.97 and is correct for the footage we shot with the XH G1)
		* Edit your movie using *only* the left camera's footage. You can do whatever you want here *except* resize the footage... so masks, effects, time stretching, opacity...is all fair game
		* When you are done with the cut you want, select your composition and then select File > Scripts > Run Script File... and select my attached Create3dComp.jsx
		* Blamo! you now have a new comp that is named YourComp_3dified and it  will have widened the composition and placed the right camera's footage next to the left, flipped and ready to go.
		* You can export as you would normally. Note: This script creates compositions that are 2880x1080 with wide pixels, when you export out of after effects you will need to select a custom aspect ratio to get the full 3840x1080 with square pixels. 
	*/

        
        function reverseMask(layer){
			try{
				var mask = layer.property("ADBE Mask Parade").property(1); 
			}catch(e){
				return;
			}
			var oldShape = mask.property("ADBE Mask Shape").value;
			if(!oldShape || !oldShape.vertices){
				alert("could not get mask vertex array, skipping");
				return;
			}
			var newShape = new Shape(); 
			var newVertices = [];
			var newInTangents = [];
			var newOutTangents = [];
			for(var j = 0; j < oldShape.vertices.length; j++){
					newVertices[j]  = [ 1440 - oldShape.vertices[j] [0], oldShape.vertices[j] [1] ];
			}
			for(var j = 0; j < oldShape.inTangents.length; j++){
					newInTangents[j] = [ -oldShape.inTangents[j][0], oldShape.inTangents[j][1] ];
			}
			for(var j = 0; j < oldShape.outTangents.length; j++){
					newOutTangents[j] = [ -oldShape.outTangents[j][0], oldShape.outTangents[j][1] ];
			}

			newShape.closed = oldShape.closed;
			newShape.vertices = newVertices; 
			newShape.inTangents = newInTangents;
			newShape.outTangents = newOutTangents;

			mask.property("ADBE Mask Shape").setValue(newShape); 
    }
        
	function Creat3dComp(myComp, footage){
		var comp_layers = myComp.layers;

		for(var i = comp_layers.length; i > 0; i--) {
			var thisLayer = comp_layers[i];
			var wasLocked = thisLayer.locked;
			if (wasLocked) {
				thisLayer.locked = false;
			}
		
			var newLayer = thisLayer.duplicate();
			newLayer.Transform.Position.setValue([2160, 540]); 
			newLayer.Transform.Scale.setValue([-100, 100]);
			for(var j = 0; j < footage.length; j++){
				if(newLayer.source.file.name.replace("LEFT", "RIGHT") == footage[j].file.name){
					newLayer.replaceSource(footage[j], false);
					reverseMask(newLayer);
					break;
				}
			}
			if (wasLocked) {
				thisLayer.locked = true;
			}
		}
	}

	var proj = app.project;
	if (proj) {
		var footageItems = [];
		for(var i = 1; i <= proj.items.length; i++){
			if(proj.items[i] instanceof FootageItem){
				footageItems.push(proj.items[i]);
			}
		}
		var undoStr = "Create 3d Comp";
		var activeItem = app.project.activeItem;
		if (activeItem != null && (activeItem instanceof CompItem)){
			app.beginUndoGroup(undoStr);

			var comp3d = activeItem.duplicate();
			comp3d.name = activeItem.name + "_3dified";
			comp3d.width = 2880;
			comp3d.height = 1080;
			Creat3dComp(comp3d, footageItems);

			app.endUndoGroup();
		} else {
			alert("Please select a comp to use this script");
		}
	} else {
		alert("Please open a project first to use this script.");
	}
}