- Bug: material emit was ignored (showed in preview render backdrop) - Bug: world exposure was ignored - Bug: lamp halo was ignoring 'render layer light override'. Further reshuffled the way shadows are being pre-calculated, this to enable more advanced (and faster) usage of Material lightgroups. Now shadows are being cached in lamps, using a per-sample counter to check if a recalc is needed. Will also work (later) for Raytracing node shaders. - New: Material LightGroup option "Always", which always shades the lights in the group, independent of visibility layer. (so it allows to move such lights to hidden layer, not influencing anything).