[Moved, for the most part, from the http://www.gamesas.com/forum/183-skyrim-mods/ by yours truly - in the hope that it might be more relevant to this forum and reduce unnecessary work]
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Way back, on ISO:2011-Dec-03, I posted "http://www.gamesas.com/topic/1302743-req-sizeable-weather-effect-exclusion-subspace/page__p__19607915#entry19607915" to ask for a sizable subspace or box modders could use to exclude the shader effects of precipitation (rain and snow) from underneath external shelters and bridges, etc.
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By ISO:2012-Jun-12, http://skyrim.nexusmods.com/users/1091907 developed this into a work in progress http://skyrim.nexusmods.com/mods/18651. On ISO: 2012-Jul-02 http://forums.nexusmods.com/index.php?/topic/717365-shader-particle-geometry-applied-to-weathers-are-different but the thread remained unresolved. http://skyrim.nexusmods.com/users/4042154/ independently developed and uploaded a similar work in progress, called "http://skyrim.nexusmods.com/mods/31629" on ISO:2013-Feb-14. Obviously, the problem has been resolved, only with respect to the unmodified portions of the game, twice!
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So, having modified an exterior that includes sheltered spaces such as alcoves and covered balconies, I would like to know how this is done. I have been unable to find anything on this in the wiki and, so, I am asking the question here.
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Thanks in Advance...