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Maya tool for finding the symmetry of a polygon mesh based on the topology.
The Poly Symmetry Tool uses an iterative algorithm to compute the symmetry of a mesh that has the same topology on either side of the center edge loop. The tool requires the user to provide pairs of symmetrical components to start (see below) on pair of symmetrical vertex shells (a vertex shell is usually symmertical to itself). After that, the algorithm walks the topology outward from the user provided components and produces a symmetry table for the edges, faces, and vertices.
The symmetry table can be used for mirroring and flipping data associated with the mesh, such as: skinWeights, deformer weights, blendshape targets, etc. Because topology symmetry is indifferent to the world position of the vertices, you could use the symmetry table to mirror weights on a deformed character without having to return to the bind pose.