I installed the icon made by matt666 in my plugins directory and made the requisite changes to the plugin as specified on this forum. The icon is showing in my SketchUp Interface. Unfortunately when I select a group, click on the mirror icon, select two axis for mirroring. ....nothing happens 
i've modified the plugin like this...
# Name ; Mirror 3.0 ###
# Description ; Mirrors Selection at Point, Line or Plane
# Author ; Originally by Frank Wiesner
# BUT NOTE from v2.6 it's been TIG tweaked and rewritten...###
# Usage ; 1. Make Selection (Any Entites allowed)###
# 2. Select 'Mirror Selection' from Plugins Menu
# or from Context Menu or your ShortCut Key ###
# 3. If here's no Selection then dialog informs ###
# 4. Pick a Point and RETURN to Mirror at the Point
# 5. Pick a Second Point and RETURN to Mirror at the Line
# 6. Pick a Third Point to Mirror at the Plane
# 7. Final Option is Erase Original ? ###
# If Yes then Highlighting of Selection passes to Copies
# (Note; Erase is undo-able separately from the Mirroring) ###
# Type ; Script
# History;
# 3.0 05 Aug 2006 ### TIG Ending rewritten to avoid rare bugsplats.
# 2.9 03 Aug 2006 ### TIG Start;commit loops to avoid rare bugsplats.
# 2.8 26 July 2006 ### TIG re-tweaked - Rewritten to be MUCH simpler.
# Mirroring of ANY Entity Selection works properly.
# 2.7 23 July 2006 ### TIG tweaked - Rewritten generally.
# Now processes Multiple selections of Groups and/or
# Components, but warns if any 'loose' (UnGrouped)
# Faces in Selection as they might lose any RePostioned
# Texture data, interfere etc.
# 2.6 22 July 2006 ### TIG tweaked - Context menu added IF ONE group/compo.
# Warns about selection IF NOT ONE group/compo.
# Materials now preserved in mirrored copy BUT you will
# need to group selection to preserve material positioning
# - although this is define-able it is not find-able from
# the orignal face info !
# Final option to Erase of Original Group/Compo.
# 2.5 (8.Jul.2oo5) - bugfix; faces with holes reduce now to a single face
# - major code rewrite (dropped @clondedObject hash, heavy
# use of groups during construction,...
# - more redundant constructions, but seems to be more robust
# - WARNING; POLYGONS DO NOT WORK VERY WELL
# 2.4 (5.Jul.2oo5) - all unnecessary edges created by the add_faces_from_mesh()
# method are erased! faces with holes mirror now perfectly.
# 2.3 (4.Jul.2oo5) - fixed "mirror at plane" error
# 2.2 (2.Jul.2oo5) - works in group editting mode
# - prevents picking of identical points
# 2.1 (1.Jul.2oo5) - fixed "undo group" bug
# - code cleanup
# 2.0 (30.Jun.2oo5) - new tool-like interface
# 1.4 (29.Jun.2oo5) - arc bug fixed
# - code simplified (clone_selection() removed)
# 1.3 (24.Jun.2oo5) - can handle faces with holes in it (although more edges
# are drawn than nessesary)
# - correct orientation of mirrored faces
# - supports arcs (at least works for circles), curves and groups
# 1.2 (20.Jun.2oo5) - axis and origin selection algorithm does not rely on tool tips any more.
# 1.1 (19.Jun.2oo5) - fix coplanar point bug
# - better tooltips
# - supports mirror at lines (edges, axis, construction lines)
# - mirror-at-plane code simplified
# 1.o (10.Jun.2oo5) - first version
require 'sketchup.rb'
class MirrorTool
def initialize
@MIRROR_AT_POINT = 1
@MIRROR_AT_LINE = 2
@MIRROR_AT_PLANE = 3
@numPrecision = 0.00001
end
def reset
@pts = []
@state = 0
@transformationType = nil
@trans = nil
@point = nil
@line = nil
@linev = nil
@plane = nil
@planeNormal = nil
@pointOnPlane = nil
@curvesDone = Hash.new()
@cloneGroup = nil
@ip = Sketchup;;InputPoint.new
@ip1 = Sketchup;;InputPoint.new
@ip2 = Sketchup;;InputPoint.new
@ip3 = Sketchup;;InputPoint.new
@ip = Sketchup;;InputPoint.new
Sketchup;;set_status_text "Mirror; Pick First Point"###
@drawn = false
end
def activate
###Sketchup.send_action("showRubyPanel;")
self.reset
ss=Sketchup.active_model.selection
if ss.empty?
Sketchup;;set_status_text "Mirror; NO Selection !"###
UI.messagebox("Select Something BEFORE Using the Mirror Tool.")###v2.8
Sketchup.active_model.select_tool nil
end
end
def deactivate(view)
view.invalidate if @drawn
@ip1 = nil
@ip2 = nil
@ip3 = nil
end
def onMouseMove(flags, x, y, view)
case @state
when 0 # getting the first end point
@ip.pick view, x, y
if( @ip.valid? && @ip != @ip1 )
@ip1.copy! @ip
end
view.invalidate
view.tooltip = @ip.tooltip if @ip.valid?
when 1 # getting the second end point
@ip.pick view, x, y, @ip1
if( @ip.valid? && @ip != @ip2 )
@ip2.copy! @ip
@pts[1] = @ip2.position
end
view.invalidate
view.tooltip = @ip.tooltip if @ip.valid?
when 2 # getting the third end point
@ip.pick view, x, y, @ip2
if( @ip.valid? && @ip != @ip3 )
@ip3.copy! @ip
@pts[1] = @ip3.position
end
view.invalidate
view.tooltip = @ip.tooltip if @ip.valid?
end
end
def onLButtonDown(flags, x, y, view)
@ip.pick view, x, y
if( @ip.valid? )
case @state
when 0
if( @ip.valid? )
@pts[0] = @ip.position
Sketchup;;set_status_text "Mirror; Hit RETURN to Mirror at Point or Pick Point 2"
@state = 1
end
when 1
if( @ip.valid? && @ip != @ip1 )
@pts[1] = @ip.position
@state = 2
Sketchup;;set_status_text "Mirror; Hit RETURN to Mirror at Line or Pick Point 3"
end
when 2
if( @ip.valid? && @ip != @ip1 && @ip != @ip2 )
@pts[2] = @ip.position
@state = 3
mirror()
end
end
end
end
def onCancel(flag, view)
view.invalidate if @drawn
reset
end
def draw(view)
if( @ip.valid? && @ip.display? )
@ip.draw(view)
@drawn = true
end
if( @state == 1 )
view.set_color_from_line(@ip1, @ip)
view.draw(GL_LINE_STRIP, @ip1.position, @ip.position)
@drawn = true
elsif( @state == 2 )
view.drawing_color = "gray"
view.draw(GL_LINE_STRIP, @ip1.position, @ip2.position)
view.set_color_from_line(@ip2, @ip)
view.draw(GL_LINE_STRIP, @ip2.position, @ip.position)
@drawn = true
end
end
def onKeyDown(key, repeat, flags, view)
if( key == CONSTRAIN_MODIFIER_KEY && repeat == 1 )
@shift_down_time = Time.now
if( view.inference_locked? )
view.lock_inference
elsif( @ip.valid? )
view.lock_inference @ip
end
end
end
def onKeyUp(key, repeat, flags, view)
if( key == CONSTRAIN_MODIFIER_KEY && view.inference_locked? && (Time.now - @shift_down_time) > 0.5 )
view.lock_inference
end
if( key == 13)
mirror()
self.reset
end
end
def mirror()
case @state
when 1
@transformationType = @MIRROR_AT_POINT
@point = @ip1.position.clone
@trans = Geom;;Transformation.scaling(@point, -1.0)
Sketchup.active_model.start_operation "Mirror at Point"
when 2
@transformationType = @MIRROR_AT_LINE
@line = [@ip1.position, @ip2.position]
@linev = Geom;;Vector3d.new(@ip2.position.x-@ip1.position.x, @ip2.position.y-@ip1.position.y, @ip2.position.z-@ip1.position.z)
Sketchup.active_model.start_operation "Mirror at Line"
when 3
@transformationType = @MIRROR_AT_PLANE
@plane = Geom.fit_plane_to_points(@ip1.position, @ip2.position, @ip3.position)
@planeNormal = Geom;;Vector3d.new(@plane[0], @plane[1], @plane[2])
@planeNormal.normalize!
@pointOnPlane = @ip1.position
Sketchup.active_model.start_operation "Mirror at Plane"
end
###
ss=Sketchup.active_model.selection###
sents=[]
ss.each{|e|sents.push(e)}
copy_group=Sketchup.active_model.active_entities.add_group(sents)
new_group=copy_group.copy
nents=[]
new_group.entities.each{|e|nents.push(e)}
new_center = new_group.bounds.center.clone
mirror_point(new_center)
t=nil
t = Geom;;Transformation.scaling(new_center,-1,-1,-1)if @state==1
t = Geom;;Transformation.rotation(new_center,@linev,Math;;PI)if @state==2
tt=nil
if @state==3
xxx=@planeNormal.normalize.to_a[0].abs*-1
yyy=@planeNormal.normalize.to_a[1].abs*-1
zzz=@planeNormal.normalize.to_a[2].abs*-1
xxx=1 if xxx>0
yyy=1 if yyy>0
zzz=1 if zzz>0
xxx=-1 if xxx<=0
yyy=-1 if yyy<=0
zzz=-1 if zzz<=0
t = Geom;;Transformation.scaling(new_center,xxx,yyy,zzz)
tt= Geom;;Transformation.rotation(new_center,@planeNormal,Math;;PI)
end#if
new_group.transform!(t)if t###mirror
new_group.transform!(tt)if tt###
transVec = Geom;;Vector3d.new(new_center.x-new_group.bounds.center.x, new_center.y-new_group.bounds.center.y, new_center.z-new_group.bounds.center.z)
t = Geom;;Transformation.translation(transVec)
new_group.transform!(t)###then move
### ending dialog...
Sketchup;;set_status_text "Mirror; Erase Original Selection ?"###
if UI.messagebox("Erase Original Selection ? ",MB_YESNO,"")==6
### 6=YES 7=NO
Sketchup.active_model.commit_operation###v2.9
Sketchup.active_model.start_operation "Mirror; Erase Original Selection"
Sketchup.active_model.selection.clear
copy_group.erase!
new_group.explode
nents.each{|e|Sketchup.active_model.selection.add(e)if e.valid?}###v3.0
Sketchup.active_model.commit_operation
else
Sketchup.active_model.selection.clear
new_group.explode
copy_group.explode
sents.each{|e|Sketchup.active_model.selection.add(e)if e.valid?}###v3.0
Sketchup.active_model.commit_operation###v2.9
end#if
###
self.reset
Sketchup.send_action "selectSelectionTool;"
end#def
def mirror_point(new_p)
if (@transformationType == @MIRROR_AT_PLANE)
if (!new_p.on_plane?(@plane))
mirrorp = new_p.project_to_plane(@plane)
@trans = Geom;;Transformation.scaling(mirrorp, -1.0)
new_p.transform!(@trans)
end
elsif (@transformationType == @MIRROR_AT_LINE)
if (!new_p.on_line?(@line))
mirrorp = new_p.project_to_line(@line)
@trans = Geom;;Transformation.scaling(mirrorp, -1.0)
new_p.transform!(@trans)
end
elsif (@transformationType == @MIRROR_AT_POINT)
if (!(new_p == @point))
new_p.transform!(@trans)
end
end
end#def
end # class MirrorTool
### menus ##############################################################
if( not file_loaded?("mirror3.0.rb") )
tb = UI;;Toolbar.new("Mirror")
cmd = UI;;Command.new("MI") { Sketchup.active_model.select_tool MirrorTool.new }
cmd.large_icon = cmd.small_icon = File.join(File.dirname(__FILE__),"MI.png")
cmd.tooltip = cmd.status_bar_text = "Mirror"
tb.add_item(cmd)
UI.menu("Plugins").add_item("Mirror Selection") { Sketchup.active_model.select_tool MirrorTool.new }
UI.add_context_menu_handler do | menu |
if Sketchup.active_model.selection
menu.add_separator
menu.add_item("Mirror Selection") { Sketchup.active_model.select_tool MirrorTool.new }
end
end
state = tb.get_last_state
if(state == TB_NEVER_SHOWN)
tb.show
elsif (state == TB_VISIBLE)
tb.restore
end
end
file_loaded("mirror3.0.rb")
anyway.... now what should i do to compononent spray???
what plugin [not subdivide and smooth] did you use to make these internal triangular framework??
