Paying royalties on still images used in different engine

Hi, due to unity’s more robust visual novel system out of the box and direct x 9 support I have to use unity to make my game, but i have most of my visual novel scenes rendered as still images but made in ue4. If all i’m doing is rendering out still images then using them for my game in a separate engine do I still need to pay royalties?? Thanks.

There’s no royalty for inclusion of still images rendered from UE4 used in another product.