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Harmonic Coordinates
\(\omega\) solution of the harmonic equation
\(\triangle \omega(p) = 0 \)
\(\omega_i(p_j)=\delta_{ij}\)
(-) No-closed form solution: requires numerical solver.
(+) Positive weights, even for concave cages
Pushkar Joshi, Mark Meyer, Tony DeRose. Harmonic Coordinates for Character Articulation. SIGGRAPH 2007.