liq| er|: export AreaLight( quadlight ) - 2, set "spread","deltaangle" to dummy values
liq| er|: annotation for parameter "deltaangle" and "spread" in SpotLight
liq| er| shader|: maya_checker
liq| er|: support "light" shader type in PL
liq| rm|: exportAmbientLight(),exportAreaLight(),exportVolumeLight()
liq| as|: exportAmbientLight(),exportAreaLight(),exportVolumeLight()