How to get a selected object center?

[Mcdull]

I Want to get a object center point, the object may be a mesh,face,or group.my method is

  UI.add_context_menu_handler do |context_menu|
   context_menu.add_separator
   context_menu.add_item("center point") {

    model = Sketchup.active_model
    entities = model.active_entities
    first_entity = entities[0]
    bbx=first_entity.bounds
#    selection = model.selection
#
#          selection.each { |entity|
#              $boundbox = entity.model.bounds
#              UI.messagebox($boundbox.corner 0)
#               UI.messagebox($boundbox.corner 1)
#
#              }
#  puts selection.count
#  puts $boundbox.center
puts bbx.center.to_s

but the result is always the same,would tell me why? thank u

[Chris Fullmer]

because you are finding the bounding box for the first entitiy in the list of entities. What you want is to find the bounding box of the first entitiy in the selection set I would bet.

model = Sketchup.active_model sel = model.selection first_entity = sel[0]

try that

[Mcdull]

@chris fullmer said:

because you are finding the bounding box for the first entitiy in the list of entities. What you want is to find the bounding box of the first entitiy in the selection set I would bet.

model = Sketchup.active_model sel = model.selection first_entity = sel[0]

try that

i got it ，thank u
~