Hi,

As it been considered to support alternative normalized device coordinates for Orthographic3 and Perspective3 ?
Currently both follow the OpenGL convention so are not usable in other situations (Vulkan for instance).

I am willing to work on it if it is desired to have that in nalgebra.

I can think of two approaches:

• have separate structures in separate pathes within the crate
• u

UPDATE: almost all of the points below have been taken care of, all that remains is to add mathematically complete definitions for vector spaces and algebras to section 6.1 and 6.2 in the tutorial.

Suggested fixes for "GAP -- A Tutorial Release 4.11.0, 29-Feb-2020"

On page 41, in the first sentence after the first Example

improve HarmonicNumber implementation:
https://github.com/axkr/symja_android_library/blob/master/symja_android_library/matheclipse-core/src/main/java/org/matheclipse/core/builtin/Arithmetic.java#L1834

• https://en.wikipedia.org/wiki/Harmonic_number
• https://medium.com/cantors-paradise/the-celebrated-harmonic-numbers-and-how-to-approximate-them-b8747a4efeec