type V3X<T> = Matrix3xX<T>;
V3X
is a type alias for Matrix3xX
from nalgebra Matrix3xX
is a matrix of 3 rows and X
columns. V3X
comes to ease the pain of remembering the row/column order. You consider V3X
as a list of 3D vectors: there are X 3D-vectors, and each vector is a column.