I've been running into difficulty baking normal maps for an enemy intended for my UE4 third person shooter project; . The model uses 5 different PBR materials, and a combination of 1024 and 2k images. To cut down on system demands I'm trying to bake the textures together, and was successful with the diffuse maps, but for whatever reason the normal maps are encountering errors while baking. The gas mask on the left is the original with 2 PBR materials. The gas mask on the right was the result of attempting to bake the normal maps. Any help would be appreciated, thank you.