Grasshopper

algorithmic modeling for Rhino

Hi guys, I tried to flip surface normals but with no results. What is the right approach to flip surface normals outwards (green)? Some vector are right, some no. Hope that someone could help me!! ;-)

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Hi,

first you have to find out what is IN and what is OUT. This can be very complicated in 3D space...

You can try to build the bounding box for the structure and then check which window is next to which side of the bounding box.

Hi Raul. Yes it's complicated in 3D space. Maybe if I use "bounding box" doesn't work because floors aren't regular as square/rectangle. I would like to find a short solution for this.

the floors aren't regular but each window shows in a "normal" direction (+/X or +/-Y).

Maybe you can also try to translate/transform the window shapes and the corresponding vector to the ground (XY). Then you can decide whats UP and whats DOWN.

Hi Landscape,

Why not using normal vectors from wall surfaces? It's automatically directed to the outside if you extrude it, just make a group of windows curve by closest distances to the wall.

Another approach will be same as Raul said, make a closed brep with floor surface, move windows centroid with their own normal vector, check which normal vector are directed to the inside with brep inside, pick the wrong curves, then flip it with transpose method (custom script).

Amazing, it works!! Thank U Raul & Yasser!! ;-)

Glad to hear that, :)

By the way, here's more simpler way:

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