Re: [Glsdk-devel] [GLm] api

[<gl...@mo...>]

> What do you mean 'mathematical operations or software operations'?

In math we can graphically represent vectors as arrows pointing form
(point A to B. It's hard to imagine how we could visualize Mul operation
in such form.

In graphics library we often use vectors to represent size or other
things. Especially when comes to 2D rendering, transforming vectors by
means of Add/Mul is more common than transforming my multiplying (x, y,
1.0) vector by 3x3 matrix for the sake of both simplicity and performance.

Even in 3D space. Imagine a volume defined as a box with origin at point A
and a size of S. If point B lays within this box then C = (B - A) / S
gives texture-space coordinate for point B. An alternative would be to
define a 4x4 transformation matrix that transforms point B into texture
space. Such matrix would be defined as conjunction of glmMatTranslate and
glmMatScale.


These are the kind of examples showing that even if something is useless
in math, it's useful in programming.
Sorry for speaking in riddles the first time ;)

It's bed time for me. Cheers.