\text{Distortion Energy,}~E=\Sigma _{(i,j)\in E(\mathcal{S})} ~w_{ij}~\|\textbf{u}_\text{i} - \textbf{u}_\text{j}\| ^ 2 \text{, where } w_{ij} = \frac{1}{\|\textbf{v}_\text{i} - \textbf{v}_\text{j}\|}\text{, } \{\textbf{u}_\text{i}\}\in\mathcal{S}^*\text{, }\{\textbf{v}_\text{i}\}\in\mathcal{S}
