automate the retopo workflow

retopologyWorkflow.py

'''
Automates the workflow in the tutorial below...
http://cgcookie.com/blender/2011/08/08/retopology-with-the-bsurfaces-add-on/
make the lidar active and in 3d view press space and type retopo workflow.
Creates the setup for the active / last selected object.
'''

bl_info = {
	"name": "Retopo Workflow",
	"description": " setup and automate the retopo workflow ",
	"author": "Sreenivas Alapati",
	"version": (1, 0),
	"blender": (2, 65, 0),
	"category": "Mesh"}

import bpy 

def main(self, context):
	C = bpy.context
	D = bpy.data
	O = bpy.ops
	name = C.active_object.name
	if D.objects[name].type != 'MESH':
		print ('You have selected a non mesh object')
	else:
		# add mesh
		O.mesh.primitive_plane_add()
		# set its positon to lidar's origin 
		C.object.location.xyz = bpy.data.objects[name].location.xyz
		# rename the object as name_retopo
		C.active_object.name = name + '_retopo'
		# get the name of the object as retopo         
		retopo = C.active_object.name    
		
		# apply shrinkwrap and rename
		O.object.modifier_add(type='SHRINKWRAP')      
		D.objects[retopo].modifiers['Shrinkwrap'].target = bpy.data.objects[name]
		D.objects[retopo].modifiers['Shrinkwrap'].name = name + '_Shrinkwrap'
		
		# delete the verts    
		O.object.editmode_toggle()
		O.mesh.delete(type='VERT')
		O.object.editmode_toggle()

		# create a new grease pencil layer and rename it
		O.gpencil.data_add()
		O.gpencil.layer_add()        
		D.objects[name + '_retopo'].grease_pencil.name = name + '_gpencil'
		# set the layer mode to surface
		D.grease_pencil[name + '_gpencil'].draw_mode = 'SURFACE'
		
		self.report({'INFO'}, " Created setup for retopo ")
	return

class RetopoWorkflow(bpy.types.Operator):
	""" sets the object ready for retopo """
	bl_idname = "object.retopo_workflow"
	bl_label = "Retopo Workflow"
	bl_options = {'REGISTER', 'UNDO'}

	@classmethod
	def poll(cls, context):
		return context.active_object is not None

	def execute(self, context):
		main(self, context)
		return {'FINISHED'}

def register():
	bpy.utils.register_class(RetopoWorkflow)

def unregister():
	bpy.utils.unregister_class(RetopoWorkflow) 

if __name__ == "__main__":
	register()