Flip certain surfaces

Grasshopper
,
1

A simple question (I hope):

I have a bunch of imported surfaces that are not oriented as I would need them to be and I am wondering if it’s possible to flip them so that their normal vectors point “outside” of the breps on which these surfaces are located.

That is - the surfaces on the right side of my screenshot are oriented correctly and the left ones are the ones that I need to flip.

Does anyone have a tip on what would be the best way of doing it?

I was thinking of using the Flip component, but with my limited GH knowledge I can’t seem to be able to figure out how to select only the nearest faces of the Breps for the Flip Guide parameter.

image
image1098×720 118 KB

image
image966×390 30.9 KB

Flip Surfaces.gh (19.7 KB)

2

Your geometry is not internalized.

If the surfaces can be joined into a ‘Closed Brep’, all the face normals will be outward.

3

Thanks. My bad, I’ve just replaced the file.
My surfaces need to stay separated more or less the way they are right now. Or maybe I don’t quite follow.

4

Flip Surfaces_2023Nov6a
Flip Surfaces_2023Nov6a1679×633 94.8 KB

Flip Surfaces_2023Nov6a.gh (30.4 KB)

P.S. Small changes, added Extrude:

Flip Surfaces_2023Nov6b
Flip Surfaces_2023Nov6b1437×470 86.8 KB

Flip Surfaces_2023Nov6b.gh (28.4 KB)

1 Like
5

Oh wow, thank you so much! That works perfectly.