Twist Bias, Depth & Normal settings, shadows, play around with the scale of the scene (zoom in all objects).
If the objects are static, make them Static and bake the shadows into Lightmaps. I'm sure the author of the screenshot at the top did.
Oh, normal bias set to 0 and all was well :) Thank you! - Murray.Prohask commented on April 19th 20 at 12:47
@Murray.Prohask, however, that there is not 0.0 in fact, a 0.01 or something. Just limit, this value can not be null, and sometimes when the scale mashenki, even 0.01 lot. - toney_Schmitt commented on April 19th 20 at 12:50