How do we already know this one surface up to normal face?

Rhino Rhino for Windows
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1

howto
howto1514×660 141 KB
maybe its flip inside someone not, do you guy have some idea to flip whole surface to normal face?

2

Joined breps should automatically have all face normals pointing outwards. Your objects doesn’t seem to be Joined?

// Rolf

3

i don’t join it, ahhh i got it. thank a lots