Hey, normally a VN has a "flat" background so the rules account for this only. We've had this question in the past, so full answer is here: Post by Gubbles in !READ THIS! Rules, Interpretations, & FAQ
If you have any more questions, please ask them in this year's !READ THIS! Rules, Interpretations, & FAQ post. We'd like to keep them all in the same place so people don't have to check several different pages! Thank you.