Hi there, i’ve recently (yesterday) posted a similar question i realize. I used latest 4.12 and have some similar issues. I will have to experiment some more to see how i can tone down these artefacts. But wanted to link these two answerhub questions: Issue with sliding AO shadows with movable lights - Rendering - Unreal Engine Forums
Any additional information about this and steps how to minimize/compensate for the artefacts will be much appreciated.