mesh_select_connected_faces.py

# mesh_select_connected_faces.py Copyright (C) 2011, Dolf Veenvliet
#
# Extrude a selection from a mesh multiple times
#
# ***** BEGIN GPL LICENSE BLOCK *****
#
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ***** END GPL LICENCE BLOCK *****
'''
    bl_info = {
    "name": "Select connected faces",
    "author": "Dolf Veenvliet",
    "version": (1,),
    "blender": (2, 56, 0),
    "location": "View3D > Select",
    "description": "Select all faces connected to the current selection",
    "warning": "",
    "wiki_url": "",
    "tracker_url": "",
    "category": "Mesh"}

"""
Usage:

Launch from from "Select -> Connected faces"

Additional links:
	Author Site: http://www.macouno.com
	e-mail: dolf {at} macouno {dot} com
"""
'''
import bpy, mathutils, math
from bpy.props import IntProperty, BoolProperty


class Select_connected_faces():

	# Initialise the class
	def __init__(self, context, iterations, extend):

		self.ob = context.active_object
		bpy.ops.object.mode_set(mode='OBJECT')

		# Make a list of all selected vertices
		selVerts = [v.index for v in self.ob.data.vertices if v.select]

		hasSelected = self.hasSelected(self.ob.data.polygons)

		for i in range(iterations):

			nextVerts = []

			for f in self.ob.data.polygons:

				if self.selectCheck(f.select, hasSelected, extend):

					for v in f.vertices:
						if v in selVerts:
							f.select = True

					if f.select:
						for v in f.vertices:
							if v not in selVerts:
								nextVerts.append(v)

				elif self.deselectCheck(f.select, hasSelected, extend):

					for v in f.vertices:
						if v in selVerts:
							f.select = False


			selVerts = nextVerts

		bpy.ops.object.mode_set(mode='EDIT')



	# See if the current item should be selected or not
	def selectCheck(self, isSelected, hasSelected, extend):

		# If the current item is not selected we may want to select
		if not isSelected:
			return True

		return False



	# See if the current item should be deselected or not
	def deselectCheck(self, isSelected, hasSelected, extend):

		# If the current item is selected we may want to deselect
		if isSelected:

			# If something is selected and we're not extending we want to deselect
			if hasSelected and not extend:
				return True

		return False



	# See if there is at least one selected item
	def hasSelected(self, items):

		for item in items:
			if item.select:
				return True

		return False



class Select_init(bpy.types.Operator):
	'''Select all faces connected to the current selection'''
	bl_idname = 'mesh.select_connected_faces'
	bl_label = 'Select connected faces'
	bl_options = {'REGISTER', 'UNDO'}

	# Iterations
	iterations = IntProperty(name='Iterations', default=1, min=0, max=1000, soft_min=0, soft_max=100)

	extend = BoolProperty(name='Extend', description='Extend the current selection', default=False)

	@classmethod
	def poll(cls, context):
		obj = context.active_object
		return (obj and obj.type == 'MESH' and bpy.context.tool_settings.mesh_select_mode[0] == False and bpy.context.tool_settings.mesh_select_mode[1] == False and bpy.context.tool_settings.mesh_select_mode[2] == True)

	def execute(self, context):
		SELECT_CONNECTED = Select_connected_faces(context, self.iterations, self.extend)
		return {'FINISHED'}