Shaded viewport problem

i dont know why
i read all topic but nothing worked!!
help
as u can see the render virew doesnt have any problem
and when i render it with rhino machine it doesnt have any problem but when i render it with vray all surfaces it’s will be like twistet surfaces as u can see in picture <img src=“https://global.discourse-cdn.com/mcneel/uploads/default/11198/cbc99f3cf7836ae4.jpg” width=“690” height=“175”

i found the solution it just tu far from cplane cand i just move it to the cplane and my problem is gone!!
thx

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