Finding Bottom Face

[majid866]

Dear Friends,
Following codes find bottom face of groups. when groups are closed loop problem will happen. You can see open loop and closed loop in photo.
code:…

        temp_grp = Sketchup.active_model.entities.add_group
        grp.entities.grep(Sketchup::Face) do |f|
          temp_grp.entities.add_face f.vertices if f.normal == [0, 0, -1]
        end
        temp_grp.material = "red"

I changed group position to show problem. Can you help me to know why it happen and how can I solve this problem?

[Neil_Burkholder]

@majid866

grp.entities.grep(Sketchup::Face) do |f|
  temp_grp.entities.add_face f.vertices if f.normal == [0, 0, -1]
end

Check out the face.loops, and face.outer_loop properties. Note that loops contains the outer_loop as well.

Class: Sketchup::Face

grp.entities.grep(Sketchup::Face) do |f|
  temp_grp.entities.add_face(f.outer_loop.vertices) if f.normal == [0, 0, -1]
  loops = f.loops.reject { |l| l == f.outer_loop }
  loops.each do |loop|
    face = temp_grp.entities.add_face(loop.vertices)
    face.erase!
  end
end