blender/release/scripts/mesh_boneweight_copy.py

#!BPY
"""
Name: 'Bone Weight Copy'
Blender: 241
Group: 'Object'
Tooltip: 'Copy Bone Weights from 1 weighted mesh, to other unweighted meshes.'
"""

import Blender
from Blender import Armature, Object, Mathutils, Window, Mesh
Vector= Mathutils.Vector
SMALL_NUM= 0.000001
def copy_bone_influences(_from, _to, PREF_SEL_ONLY, PREF_NO_XCROSS):
	ob_from, me_from, world_verts_from, from_groups=  _from
	ob_to, me_to, world_verts_to, dummy=  _to	
	del dummy
	
	def getSnapIdx(seek_vec, vecs):
		'''
		Returns the closest vec to snap_points
		'''
		
		# First seek the closest Z axis vert idx/v
		seek_vec_x,seek_vec_y,seek_vec_z= tuple(seek_vec)
		
		from_vec_idx= 0
		
		len_vecs= len(vecs)
		
		upidx= len_vecs-1
		loidx= 0
		
		_range=upidx-loidx 
		# Guess the right index, keep re-adjusting the high and the low.
		while _range > 3:
			half= _range/2
			z= vecs[upidx-half][1].z
			if z >= seek_vec_z:
				upidx= upidx-half
			elif z < seek_vec_z:
				loidx= loidx+half
			
			_range=upidx-loidx 
		
		from_vec_idx= loidx
		
		# Seek the rest of the way. should only need to seek 2 or 3 items at the most.
		while from_vec_idx < len_vecs and vecs[from_vec_idx][1].z < seek_vec_z:
			from_vec_idx+=1
		
		# Clamp if we overstepped.
		if from_vec_idx  >= len_vecs:
			from_vec_idx-=1
		
		close_dist= (vecs[from_vec_idx][1]-seek_vec).length
		close_idx= vecs[from_vec_idx][0]
		
		upidx= from_vec_idx+1
		loidx= from_vec_idx-1
		
		# Set uselo/useup. This means we can keep seeking up/down.
		if upidx >= len_vecs:	useup= False
		else:					useup= True
			
		if loidx < 0:			uselo= False
		else:					uselo= True
		
		# Seek up/down to find the closest v to seek vec.
		while uselo or useup:
			if useup:
				if upidx >= len_vecs:
					useup= False
				else:
					i,v= vecs[upidx]
					if (not PREF_NO_XCROSS) or ((v.x >= -SMALL_NUM and seek_vec_x >= -SMALL_NUM) or (v.x <= SMALL_NUM and seek_vec_x <= SMALL_NUM)): # enfoce  xcrossing
						if v.z-seek_vec_z > close_dist:
							# the verticle distance is greater then the best distance sofar. we can stop looking up.
							useup= False
						elif abs(seek_vec_y-v.y) < close_dist and abs(seek_vec_x-v.x) < close_dist:
							# This is in the limit measure it.
							l= (seek_vec-v).length
							if l<close_dist:
								close_dist= l
								close_idx= i
					upidx+=1
			
			if uselo:
				
				if loidx == 0:
					uselo= False
				else:
					i,v= vecs[loidx]
					if (not PREF_NO_XCROSS) or ((v.x >= -SMALL_NUM and seek_vec_x >= -SMALL_NUM) or (v.x <= SMALL_NUM and seek_vec_x  <= SMALL_NUM)): # enfoce  xcrossing
						if seek_vec_z-v.z > close_dist:
							# the verticle distance is greater then the best distance sofar. we can stop looking up.
							uselo= False
						elif abs(seek_vec_y-v.y) < close_dist and abs(seek_vec_x-v.x) < close_dist:
							# This is in the limit measure it.
							l= (seek_vec-v).length
							if l<close_dist:
								close_dist= l
								close_idx= i
					loidx-=1
				
		return close_idx
	
	
	to_groups= me_to.getVertGroupNames() # if not PREF_SEL_ONLY will always be []
	from_groups= me_from.getVertGroupNames()
	
	if PREF_SEL_ONLY: # remove selected verts from all groups.
		vsel= [v.index for v in me_to.verts if v.sel]
		for group in to_groups:
			me_to.removeVertsFromGroup(group, vsel)  
	else: # Add all groups.
		for group in from_groups:
			me_to.addVertGroup(group)
		
	
	add_ = Mesh.AssignModes.ADD
	
	for i, co in enumerate(world_verts_to):
		if (not PREF_SEL_ONLY) or (PREF_SEL_ONLY and me_to.verts[i].sel):
			
			Window.DrawProgressBar(0.99 * (i/float(len(world_verts_to))), 'Copy "%s" -> "%s" ' % (ob_from.name, ob_to.name))
			
			from_idx= getSnapIdx(co, world_verts_from)
			from_infs= me_from.getVertexInfluences(from_idx)
			
			for group, weight in from_infs:
				
				# Add where needed.
				if PREF_SEL_ONLY and group not in to_groups:
					me_to.addVertGroup(group)
					to_groups.append(group)
					
				me_to.assignVertsToGroup(group, [i], weight, add_)
	
	me_to.update()
	
# ZSORT return (i/co) tuples, used for fast seeking of the snapvert.
def worldspace_verts_idx(me, ob):
	mat= ob.matrixWorld
	def worldvert(v):
		vec= Vector(v)
		vec.resize4D()
		vec= vec*mat
		vec.resize3D()
		return vec
	verts_zsort= [ (i, worldvert(v.co)) for i, v in enumerate(me.verts) ]
	
	# Sorts along the Z Axis so we can optimize the getsnap.
	verts_zsort.sort(lambda a,b: cmp(a[1].z, b[1].z,))
	return verts_zsort


def worldspace_verts(me, ob):
	mat= ob.matrixWorld
	def worldvert(v):
		vec= Vector(v)
		vec.resize4D()
		vec= vec*mat
		vec.resize3D()
		return vec
	return [ worldvert(v.co) for v in me.verts ]
	
def subdivMesh(me, subdivs):
	oldmode = Mesh.Mode()
	Mesh.Mode(Mesh.SelectModes['FACE'])
	for f in me.faces: f.sel = 1
	
	for i in xrange(subdivs):
		me.subdivide(0)
	Mesh.Mode(oldmode)


def main():
	print '\nStarting BoneWeight Copy...'
	scn= Blender.Scene.GetCurrent()
	contextSel= Object.GetSelected()
	
	
	PREF_QUALITY= Blender.Draw.Create(3)
	PREF_NO_XCROSS= Blender.Draw.Create(0)
	PREF_SEL_ONLY= Blender.Draw.Create(0)
	
	pup_block = [\
	('Quality:', PREF_QUALITY, 0, 4, 'Generate interpolated verts so closer vert weights can be copied.'),\
	('No X Crossing', PREF_NO_XCROSS, 'Do not snap accross the zero X axis'),\
	('Copy to Selected', PREF_SEL_ONLY, 'Over wright vertex weights to selected verts on the target mesh. (use active ob as source)'),\
	]
	
	
	if not Blender.Draw.PupBlock("Copy Weights for %i Meshs" % len(contextSel), pup_block):
		return
	
	PREF_SEL_ONLY= PREF_SEL_ONLY.val
	PREF_NO_XCROSS= PREF_NO_XCROSS.val
	quality=  PREF_QUALITY.val
	
	act_ob= scn.getActiveObject()
	if PREF_SEL_ONLY and act_ob==None:
		Blender.Draw.PupMenu('Error%t|When dealing with 2 or more meshes with vgroups|There must be an active object|to be used as a source|aborting.')
		return
	
	'''
	quality= Blender.Draw.PupIntInput('Quality: ', 2, 0, 4)
	if quality==None:
		return
	'''

	sel=[]
	from_data= None
	act_ob= scn.getActiveObject()
	for ob in contextSel:
		
		if ob.getType()=='Mesh':
			me= ob.getData(mesh=1)
			groups= me.getVertGroupNames()
			
			# If this is the only mesh with a group OR if its one of many, but its active.
			if groups and ((ob==act_ob and PREF_SEL_ONLY) or (not PREF_SEL_ONLY)):
				if from_data:
					Blender.Draw.PupMenu('More then 1 mesh has vertex weights, only select 1 mesh with weights. aborting.')
					return
				else:
					# This uses worldspace_verts_idx which gets (idx,co) pairs, then zsorts.
					if quality:
						for _ob in contextSel:
							_ob.sel=0
						ob.sel=1
						Object.Duplicate(mesh=1)
						ob= scn.getActiveObject()
						me= ob.getData(mesh=1)
						# groups will be the same
						print '\tGenerating higher %ix quality weights.' % quality
						subdivMesh(me, quality)
						scn.unlink(ob)
					from_data= (ob, me, worldspace_verts_idx(me, ob), groups)
					
			else:
				data= (ob, me, worldspace_verts(me, ob), groups)
				sel.append(data)
		
	if not sel or from_data==None:
		Blender.Draw.PupMenu('Select 2 or more mesh objects, aborting.')
		if not sel and quality:
			from_data[1].verts= None
		return
	t= Blender.sys.time()
	Window.WaitCursor(1)
	
	
	# Now do the copy.
	print '\tCopying from "%s" to %i other meshe(s).' % (from_data[0].name, len(sel))
	for data in sel:
		copy_bone_influences(from_data, data, PREF_SEL_ONLY, PREF_NO_XCROSS)
	
	# We cant unlink the mesh, but at least remove its data.
	if quality:
		from_data[1].verts= None
	
	print 'Copy Compleate in %.6f sec' % (Blender.sys.time()-t)
	Window.DrawProgressBar(1.0, '')
	Window.WaitCursor(0)

if __name__ == '__main__':
	main()