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@ -152,6 +152,8 @@ class PolygonMesh(object):
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self._edges_for_vert = kwargs.get('edges for vert', None)
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self._faces_for_vert = kwargs.get('faces for vert', None)
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self._edge_map = None
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@property
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def faces_for_edge(self):
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"""returns a list of face indices for a given edge index.
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@ -168,17 +170,14 @@ class PolygonMesh(object):
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where 0 and 1 are indices into the face list
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"""
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if self._faces_for_edge is None:
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# TODO: eventually support generating this ourselves ...
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raise NotImplementedError
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self._set_up_face_edge_connectivity()
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return self._faces_for_edge
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@property
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def edges_for_face(self):
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"""returns a list of edge indices for a given face index."""
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# XXX
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if self._edges_for_face is None:
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self._edges_for_face = [[] for i in range(len(self.faces))]
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self._set_up_face_edge_connectivity()
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return self._edges_for_face
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@property
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@ -201,6 +200,27 @@ class PolygonMesh(object):
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self._faces_for_vert[vid].append(i)
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return self._faces_for_vert
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def _make_edge_map(self):
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self._edge_map = {}
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for i, edge in enumerate(self.edges):
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self._edge_map[tuple(sorted(edge))] = i
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def _set_up_face_edge_connectivity(self):
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if self._edge_map is None:
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self._make_edge_map()
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self._edges_for_face = [[] for i in range(len(self.faces))]
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self._faces_for_edge = [[] for i in range(len(self.edges))]
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for face_id, face in enumerate(self.faces):
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for i in range(len(face) -1):
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cur_edge = tuple(sorted([face[i], face[i+1]]))
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edge_id = self._edge_map[cur_edge]
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self._edges_for_face[face_id].append(edge_id)
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self._faces_for_edge[edge_id].append(face_id)
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cur_edge = tuple(sorted([face[-1], face[0]]))
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edge_id = self._edge_map[cur_edge]
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self._edges_for_face[face_id].append(edge_id)
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self._faces_for_edge[edge_id].append(face_id)
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def __unicode__(self):
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# TODO: perhaps also add connectivity here?
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d = {
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