Might be with noting that the destination application uses bump maps not normal maps , Orbiter ( space Sim). So only add bump maps to the wings model.
Sorry got that wrong, bump maps are converted to normal maps... example I was looking at it not quote Normal File, just a bump file and said it was converted on the fly.
Sorry got that wrong, bump maps are converted to normal maps... example I was looking at it not quote Normal File, just a bump file and said it was converted on the fly.