"3D document settings" confusion

[JoseLP]

Can someone please explain to me why for the 1st "3d document settings" image i've attached, the shadow tab located on the bottom provides me with multiple different options? And why for the 2nd "3d document settings" image, the same shadow tab does not provide me with those multiple different option? 

  

[Barry Kelly · Accepted solution]

In the second 3D document, you probably have uncut surface colours set to 'shaded'.

Barry.

[JoseLP]

I feel dumb now haha Thank you so very much Barry!