def vertices(self):
vxs = []
for i, vx in enumerate(self.PV):
v = Vertex()
v.index = i
pos = vx.recVertex().position()
v.x, v.y, v.z = pos.x(), pos.y(), pos.z()
v.tracks = len(vx.vxTrackAtVertex())
vxs.append(v)
return vxs
