Roughness should NOT be used on objects that will be animated. (Unless of course, the "crawley" effect is what you're after). This is caused by a bug in the roughness algorithm. One of the main work-arounds suggested, is by using a very small or fine bump-map. Another work- around is to create a DPaint (or for that matter ANY IFF) multi-gray shaded screen and apply it as an altitude map.
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