Mirrored Panels Need Normals Flipped Before Joining

[Durman]

Discussed in https://github.com/Durman/BuildingNodesDocs/discussions/15

^{Originally posted by **Wiggs72** March 22, 2022} Hi I thought this posted yesterday, so forgive me if it's a duplicate. This is a bug report. BuildingNode's "Mirror Panel" node doesn't flip the normals, so when you export to Unreal or any game engine, those mirrored panels have inverted normals. Here is an image from Blender showing the mirrored sections of the New York preset facing the wrong way. Hope you can fix it. Thanks, Wiggs