Odd shadow problem, is it Unity or the FBX file?

I have an FBX file I have imported into Unity 2017.1.0f3, but the shadow that is being cast from the top of it seems to be cut off half way along.

I have tried recalculating the normals in the Inspector, but it has made no difference. Can anyone suggest something I can try?

3278684–253544–ShadowProblem.zip (1010 KB)

What are your lighting and shadow settings, and shadow bias setting?

Is that curly piece a separate mesh object - or attached to the curved bottom surface?

Everything is set to “Ultra” with a distance of about 15. The whole thing is a single mesh. The project is attached if you want to look for yourself. It’s driving me crazy!

Select your directional light in the scene, play with the bias settings.

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It was the bias setting, it needed to be lower.

Thanks!