Re: [Glsdk-devel] [GLM] glmMatLookAt4f

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

I'm still at work. I'll take a detailed look at it in about 2.5 hours,
if no one else has by then

Branan

On Thu, Aug 28, 2008 at 2:14 PM, Henri Häkkinen <hen...@gm...> wrote:
> I am unable to get glmMatLookAt4f function working. I am following the
> formula given in the gluLookAt manpage, but still no luck. Could somebody
> take a look at my code? The test case gives me a failure. Here is my local
> copy of the function (the repos version is outdated).
>
> GLMmat4f *
> glmMatLookAt4f (GLMmat4f *out,
>                 const GLMvec3f *eye,
>                 const GLMvec3f *center,
>                 const GLMvec3f *up)
> {
>   GLMmat4f t;
>   GLMvec3f f, s, u;
>
>   assert (out);
>   assert (eye);
>   assert (center);
>   assert (up);
>
>   /* FIXME: not working */
>   /* FIXME: unoptimal implementation */
>
>   glmVecSub3f (&f, center, eye);
>   glmVecNormalize3f (&f, &f);
>   glmVecNormalize3f (&u, up);
>   glmVecCross3f (&s, &f, &u);
>   glmVecCross3f (&u, &s, &f);
>
>   out->m00 =  s.x;
>   out->m01 =  s.y;
>   out->m02 =  s.z;
>   out->m03 =  0.0f;
>   out->m10 =  u.x;
>   out->m11 =  u.y;
>   out->m12 =  u.z;
>   out->m13 =  0.0f;
>   out->m20 = -f.x;
>   out->m21 = -f.y;
>   out->m22 = -f.z;
>   out->m23 =  0.0f;
>   out->m30 =  0.0f;
>   out->m31 =  0.0f;
>   out->m32 =  0.0f;
>   out->m33 =  1.0f;
>
>   glmMatIdentity4f (&t);
>   t.m03 = -eye->x;
>   t.m13 = -eye->y;
>   t.m23 = -eye->z;
>
>   glmMatMul4f (out, out, &t);
>   return out;
> }
>
>
> --
> Henri 'henux' Häkkinen
>
>
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