blender/release/scripts/bevel_center.py

#!BPY

""" Registration info for Blender menus
Name: 'Bevel Center'
Blender: 240
Group: 'Mesh'
Tip: 'Bevel selected faces, edges, and vertices'
"""

__author__ = "Loic BERTHE"
__url__ = ("blender", "elysiun")
__version__ = "2.0"

__bpydoc__ = """\
This script implements vertex and edges bevelling in Blender.

Usage:

Select the mesh you want to work on, enter Edit Mode and select the edges
to bevel.  Then run this script from the 3d View's Mesh->Scripts menu.

You can control the thickness of the bevel with the slider -- redefine the
end points for bigger or smaller ranges.  The thickness can be changed even
after applying the bevel, as many times as needed.

For an extra smoothing after or instead of direct bevel, set the level of
recursiveness and use the "Recursive" button. 

This "Recursive" Button, won't work in face select mode, unless you choose
"faces" in the select mode menu.

Notes:<br>
	You can undo and redo your steps just like with normal mesh operations in
Blender.
"""

######################################################################
# Bevel Center v2.0 for Blender

# This script lets you bevel the selected vertices or edges and control the
# thickness of the bevel

# (c) 2004-2006 Loïc Berthe (loic+blender@lilotux.net)
# released under Blender Artistic License

######################################################################

import Blender
from Blender import NMesh, Window, Scene
from Blender.Draw import *
from Blender.Mathutils import *
from Blender.BGL import *

######################################################################
# Functions to handle the global structures of the script NF, NE and NC
# which contain informations about faces and corners to be created

global E_selected
E_selected = NMesh.EdgeFlags['SELECT']

def make_sel_vert(*co):
	v= NMesh.Vert(*co)
	v.sel = 1 
	me.verts.append(v)
	return v

def make_sel_face(verts):
	f = NMesh.Face(verts)
	f.sel = 1
	me.addFace(f)

def add_to_NV(old,dir,new):
	if old in NV.keys():		NV[old][dir] = new
	else:					   NV[old] = {dir:new}

def get_v(old, *neighbors):

	# compute the direction of the new vert
	if len(neighbors) == 1 : dir = (neighbors[0].co - old.co).normalize()
	else : dir = (neighbors[0].co - old.co).normalize() + (neighbors[1].co-old.co).normalize()
	 
	# look in NV if this vert already exists
	key = tuple(dir)
	if old in NV and key in NV[old] : return NV[old][key]
	
	# else, create it 
	new = old.co + dist.val*dir
	v = make_sel_vert(new.x,new.y,new.z)
	add_to_NV(old,key,v)
	return v

def make_faces():
	""" Analyse the mesh, make the faces corresponding to selected faces and
	fill the structures NE and NC """

	# make the differents flags consistent
	for e in me.edges:
		if e.flag & E_selected :
			e.v1.sel = 1
			e.v2.sel = 1
	
	NF =[]			  # NF : New faces
	for f in me.faces:
		V = f.v
		nV = len(V)
		enumV = range(nV)
		E = [me.findEdge(V[i],V[(i+1) % nV]) for i in enumV]
		Esel = [x.flag & E_selected for x in E]
		
		# look for selected vertices and creates a list containing the new vertices
		newV = V[:] 
		changes = False
		for (i,v) in enumerate(V):
			if v.sel :
				changes = True
				if   Esel[i-1] == 0 and Esel[i] == 1 :  newV[i] = get_v(v,V[i-1])
				elif Esel[i-1] == 1 and Esel[i] == 0 :  newV[i] = get_v(v,V[(i+1) % nV])
				elif Esel[i-1] == 1 and Esel[i] == 1 :  newV[i] = get_v(v,V[i-1],V[(i+1) % nV])
				else :								  newV[i] = [get_v(v,V[i-1]),get_v(v,V[(i+1) % nV])]
		
		if changes:
			# determine and store the face to be created

			lenV = [len(x) for x in newV]
			
			if 2 not in lenV :			  
				new_f = NMesh.Face(newV)
				if sum(Esel) == nV : new_f.sel = 1
				NF.append(new_f)
				
			else :
				nb2 = lenV.count(2)
				
				if nV == 4 :				# f is a quad
					if nb2 == 1 :
						ind2 = lenV.index(2)
						NF.append(NMesh.Face([newV[ind2-1],newV[ind2][0],newV[ind2][1],newV[ind2-3]]))
						NF.append(NMesh.Face([newV[ind2-1],newV[ind2-2],newV[ind2-3]]))
					
					elif nb2 == 2 :
						# We must know if the tuples are neighbours
						ind2 = ''.join([str(x) for x in lenV+lenV[:1]]).find('22')
						
						if ind2 != -1 :	 # They are 
							NF.append(NMesh.Face([newV[ind2][0],newV[ind2][1],newV[ind2-3][0],newV[ind2-3][1]]))
							NF.append(NMesh.Face([newV[ind2][0],newV[ind2-1],newV[ind2-2],newV[ind2-3][1]]))
						
						else:			   # They aren't
							ind2 = lenV.index(2)
							NF.append(NMesh.Face([newV[ind2][0],newV[ind2][1],newV[ind2-2][0],newV[ind2-2][1]]))
							NF.append(NMesh.Face([newV[ind2][1],newV[ind2-3],newV[ind2-2][0]]))
							NF.append(NMesh.Face([newV[ind2][0],newV[ind2-1],newV[ind2-2][1]]))
					
					elif nb2 == 3 :
						ind2 = lenV.index(3)
						NF.append(NMesh.Face([newV[ind2-1][1],newV[ind2],newV[ind2-3][0]]))
						NF.append(NMesh.Face([newV[ind2-1][0],newV[ind2-1][1],newV[ind2-3][0],newV[ind2-3][1]]))
						NF.append(NMesh.Face([newV[ind2-3][1],newV[ind2-2][0],newV[ind2-2][1],newV[ind2-1][0]]))
					
					else:
						if	(newV[0][1].co-newV[3][0].co).length + (newV[1][0].co-newV[2][1].co).length \
							< (newV[0][0].co-newV[1][1].co).length + (newV[2][0].co-newV[3][1].co).length :
							ind2 = 0
						else :
							ind2 = 1
						NF.append(NMesh.Face([newV[ind2-1][0],newV[ind2-1][1],newV[ind2][0],newV[ind2][1]]))
						NF.append(NMesh.Face([newV[ind2][1],newV[ind2-3][0],newV[ind2-2][1],newV[ind2-1][0]]))
						NF.append(NMesh.Face([newV[ind2-3][0],newV[ind2-3][1],newV[ind2-2][0],newV[ind2-2][1]]))
				
				else :					  # f is a tri
					if nb2 == 1:
						ind2 = lenV.index(2)
						NF.append(NMesh.Face([newV[ind2-2],newV[ind2-1],newV[ind2][0],newV[ind2][1]]))
					
					elif nb2 == 2:
						ind2 = lenV.index(3)
						NF.append(NMesh.Face([newV[ind2-1][1],newV[ind2],newV[ind2-2][0]]))
						NF.append(NMesh.Face([newV[ind2-2][0],newV[ind2-2][1],newV[ind2-1][0],newV[ind2-1][1]]))
					
					else:
						ind2 = min(((newV[i][1].co-newV[i-1][0].co).length, i) for i in enumV)[1]
						NF.append(NMesh.Face([newV[ind2-1][1],newV[ind2][0],newV[ind2][1],newV[ind2-2][0]]))
						NF.append(NMesh.Face([newV[ind2-2][0],newV[ind2-2][1],newV[ind2-1][0],newV[ind2-1][1]]))
				
				# Preparing the corners
				for i in enumV:
					if lenV[i] == 2 :	   NC.setdefault(V[i],[]).append(newV[i])
			
			old_faces.append(f)
			
			# Preparing the Edges
			for i in enumV:
				if Esel[i]:
					verts = [newV[i],newV[(i+1) % nV]]
					if V[i].index > V[(i+1) % nV].index : verts.reverse()
					NE.setdefault(E[i],[]).append(verts)
	
	# Create the faces
	for f in NF: me.addFace(f)

def make_edges():
	""" Make the faces corresponding to selected edges """

	for old,new in NE.iteritems() :
		if len(new) == 1 :					  # This edge was on a border 
			oldv = [old.v1, old.v2]
			if old.v1.index < old.v2.index : oldv.reverse()
			
			make_sel_face(oldv+new[0])

			me.findEdge(*oldv).flag   |= E_selected
			me.findEdge(*new[0]).flag |= E_selected

			for v in oldv : NV_ext.add(v)
		
		else:
			make_sel_face(new[0] + new[1][::-1])

			me.findEdge(*new[0]).flag |= E_selected
			me.findEdge(*new[1]).flag |= E_selected

def make_corners():
	""" Make the faces corresponding to corners """

	for v in NV.keys():
		V = NV[v].values()
		nV = len(V)
		
		if nV == 1:	 pass
		
		elif nV == 2 :
			if v in NV_ext:
				make_sel_face(V+[v])
				me.findEdge(*V).flag   |= E_selected
				
		else:
			if nV == 3 and v not in NV_ext : make_sel_face(V)
			
			else :
				
				# We need to know which are the edges around the corner.
				# First, we look for the quads surrounding the corner.
				eed = []
				for old, new in NE.iteritems():
					if v in (old.v1,old.v2) :
						if v.index == min(old.v1.index,old.v2.index) :   ind = 0
						else										 :   ind = 1
						
						if len(new) == 1:	   eed.append([v,new[0][ind]])
						else :				  eed.append([new[0][ind],new[1][ind]])
				
				# We will add the edges coming from faces where only one vertice is selected.
				# They are stored in NC.
				if v in NC:					 eed = eed+NC[v]

				# Now we have to sort these vertices
				hc = {}
				for (a,b) in eed :
					hc.setdefault(a,[]).append(b)
					hc.setdefault(b,[]).append(a)
				
				for x0,edges in hc.iteritems():
					if len(edges) == 1 :		break
				
				b = [x0]						# b will contain the sorted list of vertices
				
				for i in range(len(hc)-1):
					for x in hc[x0] :
						if x not in b :		 break
					b.append(x)
					x0 = x

				b.append(b[0])

				# Now we can create the faces
				if len(b) == 5:				 make_sel_face(b[:4])

				else:
					New_V = Vector(0.0, 0.0,0.0)
					New_d = [0.0, 0.0,0.0]
		
					for x in hc.keys():		 New_V += x.co
					for dir in NV[v] :
						for i in xrange(3):	 New_d[i] += dir[i]

					New_V *= 1./len(hc)
					for i in range(3) :		 New_d[i] /= nV
					
					center = make_sel_vert(New_V.x,New_V.y,New_V.z)
					add_to_NV(v,tuple(New_d),center)

					for k in range(len(b)-1):   make_sel_face([center, b[k], b[k+1]])
				
		if  2 < nV and v in NC :
			for edge in NC[v] :				 me.findEdge(*edge).flag   |= E_selected

def clear_old():
	""" Erase old faces and vertices """

	for f in old_faces: me.removeFace(f)
	
	for v in NV.keys():
		if v not in NV_ext :  me.verts.remove(v)

	for e in me.edges:
		if e.flag & E_selected :
			e.v1.sel = 1
			e.v2.sel = 1
	

######################################################################
# Interface

global dist
	
dist = Create(0.2)
left = Create(0.0)
right = Create(1.0)
num = Create(2)

# Events
EVENT_NOEVENT = 1
EVENT_BEVEL = 2
EVENT_UPDATE = 3
EVENT_RECURS = 4
EVENT_EXIT = 5

def draw():
	global dist, left, right, num
	global EVENT_NOEVENT, EVENT_BEVEL, EVENT_UPDATE, EVENT_RECURS, EVENT_EXIT

	glClear(GL_COLOR_BUFFER_BIT)
	Button("Bevel",EVENT_BEVEL,10,100,280,25)
	left=Number('',  EVENT_NOEVENT,10,70,45, 20,left.val,0,right.val,'Set the minimum of the slider')
	right = Number("",EVENT_NOEVENT,245,70,45,20,right.val,left.val,200,"Set the maximum of the slider")
	dist=Slider("Thickness  ",EVENT_UPDATE,60,70,180,20,dist.val,left.val,right.val,0, \
			"Thickness of the bevel, can be changed even after bevelling")
	glRasterPos2d(8,40)
	Text('To finish, you can use recursive bevel to smooth it')
	num=Number('',  EVENT_NOEVENT,10,10,40, 16,num.val,1,100,'Recursion level')
	Button("Recursive",EVENT_RECURS,55,10,100,16)
	Button("Exit",EVENT_EXIT,210,10,80,20)

def event(evt, val):
	if ((evt == QKEY or evt == ESCKEY) and not val): Exit()

def bevent(evt):
	if evt == EVENT_EXIT		: Exit()
	elif evt == EVENT_BEVEL	 : bevel()
	elif evt == EVENT_UPDATE	:
		try: bevel_update()
		except NameError		: pass
	elif evt == EVENT_RECURS	: recursive()

Register(draw, event, bevent)

######################################################################
def bevel():
	""" The main function, which creates the bevel """
	global me,NV,NV_ext,NE,NC, old_faces,old_dist

	scn = Scene.GetCurrent()
	ob = scn.getActiveObject() 
	if ob == None or ob.getType() != 'Mesh': 
		Draw.PupMenu('ERROR%t|Select a mesh object.')
		return
	
	Window.WaitCursor(1) # Change the Cursor
	
	is_editmode = Window.EditMode() 
	if is_editmode: Window.EditMode(0)
	
	me = ob.getData()

	NV = {}
	NV_ext = set()
	NE = {}
	NC = {}
	old_faces = []

	make_faces()
	make_edges()
	make_corners()
	clear_old()

	old_dist = dist.val

	me.update(1)
	if is_editmode: Window.EditMode(1)
	Window.WaitCursor(0)
	Blender.Redraw()

def bevel_update():
	""" Use NV to update the bevel """
	global dist, old_dist
	is_editmode = Window.EditMode()
	if is_editmode: Window.EditMode(0)
	fac = dist.val - old_dist
	old_dist = dist.val

	for old_v in NV.keys():
		for dir in NV[old_v].keys():
			for i in range(3):
				NV[old_v][dir].co[i] += fac*dir[i]

	me.update(1)
	if is_editmode: Window.EditMode(1)
	Blender.Redraw()

def recursive():
	""" Make a recursive bevel... still experimental """
	global dist
	from math import pi, sin

	if num.val > 1:
		a = pi/4
		ang = []
		for k in range(num.val):
			ang.append(a)
			a = (pi+2*a)/4

		l = [2*(1-sin(x))/sin(2*x) for x in ang]
		R = dist.val/sum(l)
		l = [x*R for x in l]

		dist.val = l[0]
		bevel_update()

		for x in l[1:]:
			dist.val = x
			bevel()