Weird black lines

Hi guys,

There are some weird black vertical lines and some weird dark/black spots at the top edge of my snapped 3D models. I’ve tried messing with the light settings, turning AA off, changing shader/materials and nothing works. I use no textures, just simple color material.

Also - when the game is being played, these lines flash for a millisecond when the camera is moving.

I hope someone has already encountered and fixed this issue, it’s driving me insane.

P.S. If I turn the light at an angle that makes the objects brighter, they disappear in the Scene view, however they still flash white for a millisecond during gameplay

Changing the shadows from soft to hard seems to remedy the problem in the scene view a lot. However when the game is being played, the snapped objects still flash at the point of snap.