//lightwave collada exporter does not have the proper aspect ratio set
//this script fixes the imported values for zoom
//when imported zoom is based on horizontal, this fixes and converts to vertical
//get aspect by horizontal FOV / vertical FOV from camera settings dialog in lightwave
//select the layers to fix then run this script
//is ok to pick non-camera layers, they will be ignored
//
// put script here for easy access   ->  C:\Program Files\Adobe\Adobe After Effects CS3\Support Files\Scripts
//
aspect = prompt("enter the aspect ratio","1.3333","Collada Lightwave Fix");
while(isNaN(aspect))
{
	aspect = prompt("enter the aspect ratio","1.3333","Collada Lightwave Fix");
}


//testheight = 480;
//testoldzoom = 512;
//testangley = 2*Math.atan((0.5*testheight/testoldzoom)/aspect);
//testnewzoom = testheight/(2*Math.tan(testangley*0.5));

var myactiveItem = app.project.activeItem;
if(myactiveItem)
{
	if(myactiveItem.typeName=="Composition")
	{
		height = myactiveItem.height;
		layerList = myactiveItem.selectedLayers;
		numSelLay = layerList.length;
		for(i=0;i<numSelLay;i++)
		{
			if(layerList[i].zoom)
				fixzoom(layerList[i]);
		}
	}
}
function fixzoom(theLayer)
{
	if(!theLayer.zoom.isTimeVarying)
	{
		//$.write("is not time varying\n");
		oldzoom = theLayer.zoom.value;//$.write("old zoom = " +oldzoom + "\n");
		angley = 2.0*Math.atan((0.5*height/oldzoom)/aspect);
		newzoom = height/(2.0*Math.tan(angley*0.5));//$.write("new zoom = " +newzoom + "\n");
		theLayer.zoom.setValue( newzoom);
	}
	else
	{
		//$.write("is time varying\n");
		numkeys = theLayer.zoom.numKeys;
		for(i=1;i<numkeys+1;i++)
		{
			oldzoom = theLayer.zoom.keyValue(i);//$.write("old zoom = " +oldzoom + "\n");
			angley = 2.0*Math.atan((0.5*height/oldzoom)/aspect);
			newzoom = height/(2.0*Math.tan(angley*0.5));//$.write("new zoom = " +newzoom + "\n");
			theLayer.zoom.setValueAtKey(i, newzoom);
		}
	}
}
//end of script