Maya MEL script that transfer camera attribute to locator for unity.

hq_convertCameraAttribute.mel

// file hq_convertCameraAttribute
//  	CameraDataConvert for unity.
// author Masahiko.Ishii <esuna.dev@gmail.com>
// date 2013/8/16

global proc hq_convertCameraAttribute()
{
	string $sels[]= `ls -sl`;
	string $node[]= `listRelatives -shapes $sels[0]`;
	print $node;
	if( `nodeType $node[0]`!= "camera") {
		return;
	}
	
	string $loc[]= `spaceLocator -n "cameraLocator1"`;

	connectAttr -f ($sels[0]+".tx") ($loc[0]+".tx");
	connectAttr -f ($sels[0]+".ty") ($loc[0]+".ty");
	connectAttr -f ($sels[0]+".tz") ($loc[0]+".tz");
	connectAttr -f ($sels[0]+".rx") ($loc[0]+".rx");
	connectAttr -f ($sels[0]+".ry") ($loc[0]+".ry");
	connectAttr -f ($sels[0]+".rz") ($loc[0]+".rz");

	connectAttr -f ($sels[0]+".nearClipPlane") ($loc[0]+".sx");
	connectAttr -f ($sels[0]+".farClipPlane") ($loc[0]+".sy");

	string $ex= "float $flen=  `getAttr (\""+ $node[0]+ ".focalLength\")`;\n";
	$ex+= "float $vFilApe=  `getAttr (\""+ $node[0]+ ".verticalFilmAperture\")`;\n";
	$ex+= "float $FoV= 2.0* atan((0.5*$vFilApe) / ($flen* 0.03937))* 57.29578;\n";
	$ex+= "setAttr (\""+$loc[0]+".sz\") $FoV;";

	expression -s $ex;
}