Apply transformations to a brick wall (headers only) in SketchUp

brick_wall_bumpout.rb

# Apply transformations to a brick wall (headers only)

mod = Sketchup.active_model  # Open model
ent = mod.entities  # All entities in model
sel = mod.selection  # Current selection

# Max pullout of headers in inches
max_ext = 2

ent.each { |e|

  if (e.is_a? Sketchup::ComponentInstance) and (e.definition.name == "Brick2") 
  
    # Uniform
    t1 = Geom::Transformation.translation [0 , -max_ext , 0]
    
    # Random
    t2 = Geom::Transformation.translation [0 , -rand * max_ext , 0]
    
    # Wave
    pos = e.bounds.center
    ext = 2 + ( Math::sin( pos.x * 10 ) + Math::sin( pos.z * 20 ) ) * max_ext
    ext > 0 ? ext : ext = 0
    t3 = Geom::Transformation.translation [0 , -ext , 0]
    
    # Now pull out the header
    e.transform! t3
    
  end

}