extract triangular meshes according to a certain flatness

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Permalink Reply by Damien Alomar on January 5, 2010 at 1:50pm

I'd start by comparing the normals of each plane to the world z axis. There's a handly little function that Dale wrote for comparing the angle between two vectors. The "flatness" would basically just be testing to see if that angle is below a certain threshold. One last note, sometimes the normal direction (z vector) of a plane can point down, so I would check and see if the z component of the z vector of your plane is positive or not. If it is, then just call myOn3dVector.Reverse to get it to point "up"

Permalink Reply by David Rutten on January 5, 2010 at 2:20pm

Solution without scripting:

http://en.wiki.mcneel.com/content/upload/files/MeshFaceCuller.ghx

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David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by Arthur Mamou-Mani on January 5, 2010 at 2:27pm

Thanks David but the link doesn't work and i couldnt find it there:(