A large shadow. (S.T.A.L.K.E.R.: Clear Sky)

Ruslan Manstein
Shade from the sun included ? From her it happens.

Mercenary
Yes, included. Try to disable and see not disappeared whether it's a shadow

Mercenary
No, a shadow remains

I (and not only) also have various problems with the shadows in Stalker CS and CP in the graphics card GTX 650ti and 980 and only when using DX11. So you need in the game settings to select DX10, all settings on max, except for MSAA, so the FPS did not sit down. If the shadow remains - you can try DX9, it does not help, you can resort to more radical methods.

Ruslan Manstein
The easy part! The command in the console r2_sun_near 15 will decide it.