Invert inverted axes in symetrical components

[Iltis]

Hello,

If the making process of a component is a duplication by symetrical operation, then "make unique", the axis are inverted.
(Sorry for this bad english! )

This is a problem for me for a plugin containing arcs exportation.

Do you know how to test the orientation of the axis and how to change it temporarely in my calculations if it's not direct (red, green, blue)?

I think it must be here in my code :

# Recursively export faces and exploding groups and components
def self.write_content(file, selection, tform, z)  # if z==1, it's a 3D export file, if z==0, it's a 2D export file (all the Z values are equal to "0.0" and the normal.z is equal to "1.0"
   selection.each do |entity|    
      if entity.is_a?(Sketchup;;Face)
      transform_vector_of_group(entity.normal, tform)
         if z == 1 || (z == 0 && transform_vector_of_group(entity.normal, tform).parallel?(Z_AXIS) && transform_point_of_group(entity.vertices[0].position, tform).z.abs < 0.001 ) # Sketchup tolerance ; 0.0001 inch
            $number_of_exported_faces +=1
            write_face(file, entity, tform, z)
            result = Sketchup.set_status_text $number_of_exported_faces.to_s, SB_VCB_VALUE
         end
      elsif entity.is_a?(Sketchup;;Group) || entity.is_a?(Sketchup;;ComponentInstance)
         if entity.is_a?(Sketchup;;Group)
            definition = entity.entities.parent
         else
            definition = entity.definition
         end
         write_content(file, definition.entities, tform * entity.transformation, z)
      end
   end
end

Thank you very much.
Renaud.