2D sprites flicker under directional light when camera moves/zooms

Question

I'm making a 2D game in Unity 4.6. My character and ground sprites were both imported as 2D sprites and given a material with the built-in Sprite Diffuse shader. The material works properly on my character, but the ground tiles flicker as I walk around or scroll the mouse wheel in the editor.

Adding a plain, light gray cookie to the light stopped the flickering, but it caused this to happen: http://i.imgur.com/MjQdR7o.png

Without the cookie, the ground tiles flicker from fully lit to not lit at all, like this: http://i.imgur.com/4ijEBbg.png

This applies to all tiles, not just the ones near other objects. There shouldn't be anything obstructing the light, and I don't even have shadows on since I don't have Unity Pro.

I tried reducing the camera's clipping plane and nothing happened. Any ideas?

Answer 1

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Answer by Ferb · Feb 04, 2015 at 10:05 AM

I sometimes (though not always) get the same effect when viewing my lit sprites in the editor. In all my months of testing though, it's never happened in any of my compiled versions, and I can't find any actual cause for it, so I've come to the conclusion that this is just a bug in the Unity editor.

Try compiling the program, and if that fixes the problem, I'd say don't worry about it any further.

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2D sprites flicker under directional light when camera moves/zooms

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