def rotate(ent, axis, angle)
    rv = ent.transformation.zaxis if axis == "z"
    rv = ent.transformation.yaxis if axis == "y"
    rv = ent.transformation.xaxis if axis == "x"
    rp = ent.transformation.origin
    ent.transform!(Geom::Transformation.rotation(rp, rv, angle))
end
 
 
mod = Sketchup.active_model # Open model
ent = mod.entities # All entities in model
sel = mod.selection # Current selection
 
componame="abc"
compo = Sketchup.active_model.definitions[componame]
if compo
  puts "#{componame} found: doing something else..."
  ### do something with 'compo' definition
else
  puts "#{componame} does NOT exist!"
  return
end
entity=compo.instances[0]
 
targetPoint = Geom::Point3d.new(1000.mm, 1000.mm, 0)
entity.transformation = Geom::Transformation.new(targetPoint)
 
 
angle = 30.degrees
rotate(entity, "z", angle)
rotate(entity, "x", angle)
rotate(entity, "y", angle)