Scanned model blurry polygon edges in viewport and render output as black patches

[asingh2HHCE]

Hi everyone.

I am working with a scanned 3D Model. The output mesh was tessellated. I used 3DS Max Retopology modifier, got smooth quad mesh which looks good in viewport but edges are blurry. The problem comes when I render it using ART Render, the final output shows black patches on model.

I also posted for help in lighting and rendering forum, but got no response.

Initially I thought this was a rendering issue but everything else renders fine just this model is having issues. I have tried everything I could find to solve this, I have looked through forums and found nothing on this. I have attached the part of 3d model just to show everyone the issue, actual model is very huge.

Any help will be appreciated.