Tube inside face transparent.

#1
Hi all.

I developing an aircraft right now, very popular plane, is looking great, but
im having a problem, the inside face of the tube (fuselage) is transparent,
how can i make it look grey or with a texture??:confused: .. i need to do that because
when is going to be time to animate the doors is gonna look transaparent .
I hope some can help me and understand what i mean, i attached a picture
so yo can se whats the problem.

Thanks.
 
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