Gradient Calculations for Nonrigid Surface Registration

The goal of rigid registration is to align a source surface $X$ to a target surface $Y$. The alignment process involves iteratively transforming $X$ closer and closer to $Y$, such that $X=Z^0 \rightarrow Z^1 \rightarrow Z^2 \rightarrow ... \rightarrow Z^T=Y$. By applying two simplifications, we can trace the minimization problem back to solving a system of linear equations.

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