[SOLVED] Model renders half-black (weird light absorbtion?)

Hello,

When I try to render some models using Cycles, they appear half-black. It seems that materials absorb the light or something. I can’t figure out the problem… Any help would be appreciated!

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Perhaps the normals are flipped. Turn on Backface Culling in the viewport to see if they are oriented in the right direction.

I tried turning on Backface Culling, but nothing happended
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The problem was caused by ‘Custom Split Normals Data’ (thanks to experts from Stackexchange!). If you have such a problem, you should remove ‘Custom Split Normals Data’ from your meshes.