Replacing texture tx_raindrop_01.dds causes rain to disappear
Replaced the raindrop texture using tx_raindrop_01.dds from Skies .IV mod (http://www.nexusmods.com/morrowind/mods/43311/?).
During a rainstorm, rain is not visible.
No other modifications enabled.
Running OpenMW nightly b94a4c1c
Raindrop texture is replaced and works normally in MGE.
(RM-3465 from redmine: created on 2016-07-09 by Andrew O'Connor, , closed on 2016-07-12 by nobody, duplicates #3404)