When you're doing math for graphics, physics, games, or whatever, you should use column vectors when you're representing points, differences between points, and the like.

Symbolically, you should do this $\mathbf {v} ={\begin{vmatrix}x\\y\\z\end{vmatrix}}$ and $\mathbf {v} =\mathbf {Mv}$

Not this:

That statement is not at all controversial in the fields of mathematics and physics, but in graphics, due to historical reasons, it's still an issue.