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

[H. H. <hen...@gm...>]

Actually, yes, you are absolutely correct. So

  glmMatSet3f (&mat, &a, &b, &c);

should construct

  | a.x b.x c.x |
  | a.y b.y c.y |
  | a.z b.z c.z |

Got it!


On Sun, Aug 24, 2008 at 8:47 PM, Branan Riley <br...@gm...> wrote:

> 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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-- 
Henri 'henux' Häkkinen