%---------------------------Shear---------------------------
\section{Shear\label{s:hex-shear}}

The shear metric is the minimum of the Jacobian matrix
evaluated at the element corners divided by the product of the length of the 3
edge vectors meeting at that corner:
\[
  q = \min_{i\in\{0,1,\ldots,8\}}
  \left\{
    \hat \alpha_i
  \right\}.
\]

Note that if $\hat \alpha_i \leq DBL\_MIN$ for any $i$ or if ${L_{\min}}^2 \leq DBL\_MIN$,
we set $q = 0$.

\hexmetrictable{shear}%
{$1$}%                                        Dimension
{$[0.3,1]$}%                                  Acceptable range
{$[0,1]$}%                                    Normal range
{$[0,1]$}%                                    Full range
{$1$}%                                        Cube
{\cite{knu:03}}%                              Citation
{v\_hex\_shear}%                              Verdict function name