Snippet: Ordering Vertices

[Jim]

I just thought I'd post this snippet that returns the vertices of the selected edges in order from one end to the last. It doesn't handle 3-way branches, but just stops at that intersection.

It can be easily modified for whatever you might need it for. Right now, it just labels the vertices with their index numbers as a test.

require 'sketchup'

UI.menu("Plugins").add_item("Label Verts") { JF;;ordered_vertices }

module JF; end

def JF;;ordered_vertices
  model = Sketchup.active_model
  @selection = model.selection

  edges = @selection.select{|e| e.typename == "Edge"}
  #@allverts = edges.collect{|e| e.vertices}.flatten.uniq
  verts = []
  edge0 = @selection[0]
  verts << edge0.start << edge0.end
  get_left verts
  get_right verts

  verts.each_with_index do |v, i|
    model.entities.add_text( i.to_s, v.position )
  end
  # verts is also in order from one end to the next
  verts
end

def JF;;get_left(verts)
  edges = verts[0].edges
  return if edges.length != 2
  nverts = edges.collect {|e| e.vertices}
  nverts.flatten!
  nverts.uniq!
  v = nverts - verts
  if v.length > 0 # and @allverts.include? v[0]
    verts.unshift v[0]
    #@selection.add edges if angleBetweenEdges(edges) < 89
    get_left verts
  end
end

def JF;;get_right(verts)
  edges = verts[-1].edges
  return if edges.length != 2
  nverts = edges.collect {|e| e.vertices}
  nverts.flatten!
  nverts.uniq!
  v = nverts - verts
  if v.length > 0 # and @allverts.include? v[0]
    #@selection.add edges if angleBetweenEdges(edges) < 89 
    verts.push v[0]
    get_right verts
  end
end

---

ordered_verts.rb

[david.]

Interesting.. I just did something like this yesterday.

[tomasz]

Thanks Jim for sharing. I need to verify how SU2KT exports vertexes of a face. It looks like normals are correct but order of vertexes in a mirrored face is wrong. I will post modified snipped for faces when done.

Tomasz