# Create the Command object
cmd = UI::Command.new("Mesh") {
	sel = Sketchup.active_model.selection
	ent = Sketchup.active_model.active_entities
	sel.each do |e| 
		if e.typename == "Face"
     			vertices = e.vertices

 
			lowerx = vertices[0].position.x
			lowery = vertices[0].position.y
			upperx = vertices[0].position.x
			uppery = vertices[0].position.y
			lowerz = vertices[0].position.z
			upperz = vertices[0].position.z

			for count in 1..3
				
				if lowerx > vertices[count].position.x
					lowerx = vertices[count].position.x
				end #if
				
				if lowery > vertices[count].position.y
					lowery = vertices[count].position.y
				end #if
				
				if upperx < vertices[count].position.x
					upperx = vertices[count].position.x
				end #if

				if uppery < vertices[count].position.y
					uppery = vertices[count].position.y
				end #if
		
				if lowerz > vertices[count].position.z
					lowerz = vertices[count].position.z
				end #if
		
				if upperz < vertices[count].position.z
					upperz = vertices[count].position.z
				end #if

			end #for

			ydiff = lowery.to_f - lowery.to_i
			xdiff = lowerx.to_f - lowerx.to_i
			zdiff = lowerz.to_f - lowerz.to_i

			if ydiff > ".50".to_f
				uppery_limit = uppery.to_i - 1
			else
				uppery_limit = uppery.to_i 
			end #if

			if xdiff > ".50".to_f
				upperx_limit = upperx.to_i - 1
			else
				upperx_limit = upperx.to_i
			end #if

			if zdiff > ".50".to_f
				upperz_limit = upperz.to_i - 1
			else
				upperz_limit = upperz.to_i
			end #if

			if e.normal == [0,0,-1] || e.normal == [0,0,1]
	  			for i in lowery.to_i..uppery_limit
					point1 = Geom::Point3d.new (lowerx,i+ydiff,lowerz)
					point2 = Geom::Point3d.new (upperx,i+ydiff,lowerz)
					constline = ent.add_cline point1, point2
	  			end #for

				for j in lowerx.to_i..upperx_limit
					point3 = Geom::Point3d.new (j+xdiff,lowery,lowerz) 
					point4 = Geom::Point3d.new (j+xdiff,uppery,lowerz)	
					constline2 = ent.add_cline point3, point4
	  			end #for
			end #if

			if e.normal == [-1,0,0] || e.normal == [1,0,0]
	  			for i in lowery.to_i..uppery_limit
					point1 = Geom::Point3d.new (lowerx,i+ydiff,lowerz)
					point2 = Geom::Point3d.new (upperx,i+ydiff,upperz)
					constline = ent.add_cline point1, point2
	  			end #for

				for j in lowerz.to_i..upperz_limit
					point3 = Geom::Point3d.new (lowerx,lowery,j+zdiff) 
					point4 = Geom::Point3d.new (upperx,uppery,j+zdiff)	
					constline2 = ent.add_cline point3, point4
	  			end #for
			end #if

			if e.normal == [0,-1,0] || e.normal == [0,1,0]
				for i in lowerx.to_i..upperx_limit
					point1 = Geom::Point3d.new (i+xdiff,lowery,lowerz)
					point2 = Geom::Point3d.new (i+xdiff,uppery,upperz)
					constline = ent.add_cline point1, point2
				end #for

				for j in lowerz.to_i..upperz_limit
					point3 = Geom::Point3d.new (lowerx,lowery,j+zdiff) 
					point4 = Geom::Point3d.new (upperx,uppery,j+zdiff)	
					constline2 = ent.add_cline point3, point4
	  			end #for


			end #if
		end #if typeface
	end #do
}

# Validation procedure - check for face
cmd.set_validation_proc {
   sel = Sketchup.active_model.selection
   ok = sel.find{ |e| e.typename == "Face"}
   ok ? MF_ENABLED : MF_GRAYED
}

# Access SketchUp's context menu
UI.add_context_menu_handler do |menu|
   menu.add_separator
   menu.add_item cmd
end