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