MeshData.py 文件源码

def _computeEdges(self):
        if not self.hasFaceIndexedData:
            ## generate self._edges from self._faces
            nf = len(self._faces)
            edges = np.empty(nf*3, dtype=[('i', np.uint, 2)])
            edges['i'][0:nf] = self._faces[:,:2]
            edges['i'][nf:2*nf] = self._faces[:,1:3]
            edges['i'][-nf:,0] = self._faces[:,2]
            edges['i'][-nf:,1] = self._faces[:,0]

            # sort per-edge
            mask = edges['i'][:,0] > edges['i'][:,1]
            edges['i'][mask] = edges['i'][mask][:,::-1]

            # remove duplicate entries
            self._edges = np.unique(edges)['i']
            #print self._edges
        elif self._vertexesIndexedByFaces is not None:
            verts = self._vertexesIndexedByFaces
            edges = np.empty((verts.shape[0], 3, 2), dtype=np.uint)
            nf = verts.shape[0]
            edges[:,0,0] = np.arange(nf) * 3
            edges[:,0,1] = edges[:,0,0] + 1
            edges[:,1,0] = edges[:,0,1]
            edges[:,1,1] = edges[:,1,0] + 1
            edges[:,2,0] = edges[:,1,1]
            edges[:,2,1] = edges[:,0,0]
            self._edges = edges
        else:
            raise Exception("MeshData cannot generate edges--no faces in this data.")