version = Sketchup.version.to_i
    osx     = Sketchup.platform == :platform_osx
    # select a colour list
    file = UI.openpanel(
      'Select CSV File',
      osx ? '~' : ENV['HOME'],
      osx ? '*.csv' : 'CSV Files|*.csv||'
    )

    if version >= 17
      # extract folder name
      dir = File.basename(file, '.csv')

      # create array of name and hex value
      require 'csv.rb'
      csv_data = CSV.foreach(file, headers: true).map do |row|
        h = row.to_h
        n = h['Name'].split(' ').map(&:capitalize).join(' ').rstrip
        c = [ h['R'].to_i, h['G'].to_i, h['B'].to_i ]
        [n,c]
      end

      #create new material
      # Get a handle to all the materials in the current model.
      model = Sketchup.active_model
      mats = model.materials
      path = Sketchup.find_support_file('Materials')
      main = File.join(path, dir)
      Dir.mkdir(main) unless Dir.exist?(main)

      # process data
      mats.purge_unused
      @mat = mats.add('placeholder')
      csv_data.each do |name,colour|
        filename = File.join(main, name + '.skm')
        @mat.name = name
        @mat.color = Sketchup::Color.new(colour.entries)
#sets enscape roughness parameter
@mat.set_attribute("Enscape.Material","MaterialData","<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<SketchupMaterial xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" Version=\"4\">\r\n <Roughness>0.61</Roughness> <Specular>0.5</Specular></SketchupMaterial>")
        @mat.save_as(filename)
      end
    end