This is an optimised version of RedVector. It also adds the -cross method.
Cross product.
NOTE: This is unique for RedVector3D and is not implemented for the other RedVector classes.
Matrix multiplication.
NOTE: This is unique for RedVector3D and is not implemented for the other RedVector classes.
Multiplication with a two row matrix.
NOTE: This is unique for RedVector3D and is not implemented for the other RedVector classes.
Returns: