Re: [Glsdk-devel] [GLM] open questions with the matrix api

[Branan R. <br...@gm...>]

I believe OpenGL defines a matrix constructed from vectors like this:
| a.x b.x c.x |
| a.y b.y c.y |
| a.z b.z c.z |

We should do the same for consistency.

Branan

On Sun, Aug 24, 2008 at 9:27 AM, Henri Häkkinen <hen...@gm...> wrote:
> There are some open questions in the mathlib's matrix api and I would like
> to hear your opinions.
>
> Do the matrices need member-wise constructors? For example, do we need
> something like this:
>
> GLMmat2f mat;
> glmMatSet2f (&mat, 1.0f, 2.0f, 3.0f, 4.0f);
>
> I suppose the user never needs to do anything like this, instead they use th
> higher level entry-point such as Identity and Rotate.
>
> However, there might be a need for constructing matrices from vectors.
>
> GLMvec3f a, b, c;
> GLMmat3f mat;
> glmMatSet3f (&mat, &a, &b, &c);
>
> At the moment, I have these entry-points and the matrices are constructed
> 'column-wise'. For example, the previous code creates this kind of matrix:
>
> | a.x a.y a.z |
> | b.x b.y b.z |
> | c.x c.y c.z |
>
> Should the matrices be build row-wise instead? There is an advantage in
> this, as matrix rows define the coordinate axes in a 3D coordinate space.
> However, OpenGL defines the matrix memory layout as column-wise, so I guess
> it is a kind of more logical to build them column-wise from the vectors.
>
> --
> Henri 'henux' Häkkinen
>
>
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