aenhancers

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function reverseMask (obj,maskIndex){
	// check
		if(obj==undefined){
			alert('Object undefined');return
			}
		 if(maskIndex>obj.Masks.numProperties){
			alert('Incorrect mask index specified');return
		 	}
		
	// existing mask
		var curMask=	obj.Masks.property(maskIndex).property("ADBE Mask Shape")
		var verts=		curMask.value.vertices
		var inTans=	curMask.value.inTangents
		var outTans=	curMask.value.outTangents
		
	// collect the values
		var tempVerts=[]
		var tempInTans=[]
		var tempOutTans=[]
		
		for(var i=curMask.value.vertices.length-1;i>=0;i--){
			tempVerts.push(verts[i])
			tempOutTans.push(inTans[i])
			tempInTans.push(outTans[i])
			}
		
	// build the shape
		var tempMask=new Shape()
		tempMask.vertices = tempVerts
		tempMask.inTangents = tempInTans
		tempMask.outTangents = tempOutTans
		tempMask.closed=curMask.value.closed
		
	// assign mask
		curMask.setValue(tempMask)
	}
	

reverseMask(app.project.activeItem.layers[1],1)