Triangulate triangles ?

renderiza

It works!

Here is the code...


model = Sketchup.active_model
ents = model.active_entities
sel = model.selection
faces = sel.grep(Sketchup;;Face)

model.start_operation('csplit')
  faces.each do |face|
    v = face.vertices

    cx = v[0].position.x + v[1].position.x + v[2].position.x
    cy = v[0].position.y + v[1].position.y + v[2].position.y   
    cz = v[0].position.z + v[1].position.z + v[2].position.z 

    px = cx / 3
    py = cy / 3 
    pz = cz / 3 

    v.each do |vertex|
      p1 = [px, py, pz]
      p2 = vertex
      line = ents.add_line p1,p2
    end
  end
  sel.clear
model.commit_operation

Note: At the moment the above code works with triangles only.

For squares we can use the code bellow...


model = Sketchup.active_model
ents = model.active_entities
sel = model.selection
faces = sel.grep(Sketchup;;Face)

model.start_operation('csplit')
  faces.each do |face|
    v = face.vertices

    cx = v[0].position.x + v[1].position.x + v[2].position.x + v[3].position.x
    cy = v[0].position.y + v[1].position.y + v[2].position.y + v[3].position.y  
    cz = v[0].position.z + v[1].position.z + v[2].position.z + v[3].position.z 

    px = cx / 4
    py = cy / 4 
    pz = cz / 4 

    v.each do |vertex|
      p1 = [px, py, pz]
      p2 = vertex
      line = ents.add_line p1,p2
    end
  end
  sel.clear
model.commit_operation

renderiza

The following code will work on all geometry types like triangle, square, ect...

model = Sketchup.active_model
ents = model.active_entities
sel = model.selection
faces = sel.grep(Sketchup;;Face)
@addx = []
@addy = []
@addz = []

model.start_operation('csplit')
  faces.each do |face|
    @addx.clear
    @addy.clear
    @addz.clear

    v = face.vertices
    num = v.length

    v.each_with_index {|vert,i|
      @addx << " + v[#{i}].position.x"
      @addy << " + v[#{i}].position.y"
      @addz << " + v[#{i}].position.z"
    }

    ax = @addx * ","
    sumx = ax.delete ","

    ay = @addy * ","
    sumy = ay.delete ","

    az = @addz * ","
    sumz = az.delete ","

    cx = eval("#{sumx}")
    cy = eval("#{sumy}")
    cz = eval("#{sumz}")

    px = cx / num
    py = cy / num
    pz = cz / num

    v.each do |vertex|
      p1 = [px, py, pz]
      p2 = vertex
      line = ents.add_line p1,p2
    end

  end
  sel.clear
model.commit_operation

Note: To test code above you can copy & paste it to one of this ruby consoles...
http://renderizastudio.blogspot.com/2013/06/top-ruby-consoles-for-sketchup.html

renderiza

With the help of Dan Rathbun the code was improved! Because string manipulation in Ruby can be slow he figured a way to do it without strings.

Here is the new code...

  def csplit()
    #
    model = Sketchup.active_model
    ents = model.active_entities
    sel = model.selection
    faces = sel.grep(Sketchup;;Face)
    #
    model.start_operation('csplit')
      #
      faces.each do |face|
        #
        sum = Geom;;Point3d.new(0,0,0)
        #
        verts = face.vertices
        n = verts.size.to_f
        # use API Geom;;Point3d.+ instance method;
        verts.each {|v| sum += ORIGIN.vector_to(v.position) }
        #
        avg = Geom;;Point3d.new( sum.x/n, sum.y/n, sum.z/n )
        #
        verts.each {|v| ents.add_line( avg, v ) }
        #
      end # each face
      #
    model.commit_operation
    #
  rescue => e
    #
    puts "Error <#{e.class.name}; #{e.message} >"
    puts e.backtrace if $VERBOSE
    #
    model.abort_operation
    #
  else # when no errors;
    #
    sel.clear
    #
  end # csplit()

  csplit()

If you have the time make sure to thank Dan...Cheers!