MSFS normal maps, how are you making them from height maps?

[Dylanear]

If anyone is scratching their head and has no idea what I’m talking about when I say there’s two style normals maps, “red/green” and “purple”, here’s a topic with image examples of both.

Critical problem with normal maps in MSFS (Blender workflow)

Couldn’t it be a modeling issue? Some of the faces could have their normals pointing inside and it would make the normal map and its shading look inverted. Maybe try this in Blender: Edit mode, select all faces of your model, recalculate normals outside (shift N).