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#!BPY
""" Registration info for Blender menus:
Name: 'Edges to Curve'
Blender: 241
Group: 'Mesh'
Tip: 'Edges not used by a face are converted into polyline(s)'
"""
__author__ = ("Campbell Barton")
__url__ = ("blender", "elysiun")
__version__ = "1.0 2006/02/08"
__bpydoc__ = """\
This script converts open and closed edge loops into polylines
Supported:<br>
Polylines where each vert has no more then 2 edges attached to it.
"""
from Blender import *
def sortPair(a,b):
return min(a,b), max(a,b)
def polysFromMesh(me):
# a polyline is 2
#polylines are a list
polyLines = []
# Get edges not used by a face
edgeDict= dict([ (sortPair(ed.v1.index, ed.v2.index), ed) for ed in me.edges ])
for f in me.faces:
for i in xrange(len(f.v)):
key= sortPair(f.v[i].index, f.v[i-1].index)
try:
del edgeDict[key]
except:
pass
edges= edgeDict.values()
'''
# build vert connectivite
vertConnex= [list() for i in xrange(len(me.verts))]
for ed in edges:
i1= ed.v1.index
i2= ed.v2.index
vertConnex[i1].append(i2)
vertConnex[i2].append(i1)
# verts without 2 users are none.
vertConnex=[ [None,vc][len(vc)==2] for vc in vertConnex
'''
while edges:
currentEdge= edges.pop()
startVert= currentEdge.v2
endVert= currentEdge.v1
polyLine= [startVert, endVert]
ok= 1
while ok:
ok= 0
#for i, ed in enumerate(edges):
i=len(edges)
while i:
i-=1
ed= edges[i]
if ed.v1 == endVert:
polyLine.append(ed.v2)
endVert= polyLine[-1]
ok=1
edges.pop(i)
#break
elif ed.v2 == endVert:
polyLine.append(ed.v1)
endVert= polyLine[-1]
ok=1
edges.pop(i)
#break
elif ed.v1 == startVert:
polyLine.insert(0, ed.v2)
startVert= polyLine[0]
ok=1
edges.pop(i)
#break
elif ed.v2 == startVert:
polyLine.insert(0, ed.v1)
startVert= polyLine[0]
ok=1
edges.pop(i)
#break
polyLines.append((polyLine, polyLine[0]==polyLine[-1]))
print len(edges), len(polyLines)
return polyLines
def mesh2polys():
scn= Scene.GetCurrent()
for ob in scn.getChildren():
ob.sel= 0
meshOb= scn.getActiveObject()
if meshOb==None or meshOb.getType() != 'Mesh':
Draw.PupMenu( 'ERROR: No Active Mesh Selected, Aborting' )
return
Window.WaitCursor(1)
Window.EditMode(0)
me = meshOb.getData(mesh=1)
polygons= polysFromMesh(me)
w=t=1
cu= Curve.New()
cu.setFlag(1)
ob= Object.New('Curve', me.name)
ob.link(cu)
scn.link(ob)
ob.Layers= meshOb.Layers
ob.setMatrix(meshOb.matrixWorld)
ob.sel= 1
i=0
for poly, closed in polygons:
if closed:
vIdx= 1
else:
vIdx= 0
v= poly[vIdx]
cu.appendNurb([v.co.x, v.co.y, v.co.z, w, t])
cu[i].type= 0 # Poly Line
# Close the polyline if its closed.
if closed:
cu[i].setFlagU(1)
# Add all the points in the polyline.
while vIdx<len(poly):
v= poly[vIdx]
cu.appendPoint(i, [v.co.x, v.co.y, v.co.z, w])
vIdx+=1
i+=1
Window.WaitCursor(0)
# not used as yet.
"""
def writepolys():
me = Scene.GetCurrent().getActiveObject().getData(mesh=1)
polygons= polysFromMesh(me)
file=open('/polygons.txt', 'w')
for ply in polygons:
file.write('polygon ')
if ply[1]:
file.write('closed ')
else:
file.write('open ')
file.write('%i\n' % len(ply[0]))
for pt in ply[0]:
file.write('%.6f %.6f %.6f\n' % tuple(pt.co) )
file.close()
"""
if __name__ == '__main__':
mesh2polys()
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