Normal map half working

[felix-sh]

( here is some guesswork )

if your normal map has an UnpackMin setting of zero, then it will only half work.
you can see this if you use only one point light. ( or a moving light )
lightmass can cover this up pretty good.
so when you import you should use Compression: TC_Normalmap. ( in import window )
then it will setup UnpackMin to -1 for you and the normal map will fully work.

( in texture-properties )
if you change UnpackMin from 0 to -1 manualy there is a problem. ( feb 2012 version 9505 )
it seems it will not update existing materials until you change the compression.
( so if you change to TC_Normalmap first and then UnpackMin to -1, it will still only half work )

also notice that a correctly setup normal map looks darker when you see it in the material editor.

[darthviper107]

That's not an issue, you just need to make sure you use normal map compression setting when you import your normal maps. That's always been the case.

[felix-sh]

the issue is materials not being updated. guess i picked a bad title.