What I think happens, is that, without the detail option on, the same shaders
are used for terrain and models (terrain-haze), thus they get the terminator
assigned from the teerain-default.eff. Once you enable the detailed shading
for the terrain, that uniform is no longer assigned, since in terrain-haze
there's another technique active, assigning the property to the terminator
uniform in the terrain-haze-detailed shader, thus the terminator value seen by
the terrain-haze shader active on models remains at the last value it had.
This would explain why the lighting gets fixed momentarily when you move the
landmass slider back and forth.
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