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DFAO Specular Occlusion Problem

Hi,

This isn’t something new, but I’m seeking a workaround.

With stationary skylight we get good results, but with movable skylight (DFAO enabled) we lose much of the specularity on the landscape surface. Specular occlusion is supposed to happen according to mesh curvatures, not on flat surface.

Without DFAO:

With DFAO:

Any ideas?