[Glsdk-devel] [GLM] glmMatLookAt4f

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

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copy of the function (the repos version is outdated).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