Hi All,

I am trying to get the transformation matrix between two markers.
Is there in Artoolkit any already implemented function that return the
transformation matrix between two detected markers? Matrix that would
have the same format has gl_para so I can use it in OpenGL.
I want to display my 3D geometry not on the marker but at a position
translated from it.


Any advices would be greatly appreciate as I am just beggining in AR.

Thanks
Alex
-- 
**********************************
Alexandre Gillet
The Scripps Research Institute,       tel: (858) 784-2053
Dept. Molecular Biology,  MB-5,       fax: (858) 784-2860
10550  North Torrey Pines Road,       email: gillet@s ..........
La Jolla,  CA 92037-1000,  USA.

Hi,

>I am trying to get the transformation matrix between two markers.
>Is there in Artoolkit any already implemented function that return the
>transformation matrix between two detected markers? Matrix that would
>have the same format has gl_para so I can use it in OpenGL.
>I want to display my 3D geometry not on the marker but at a position
>translated from it.

Please look at 'examples/relation/relationTest.c'.

    double wmat1[3][4], wmat2[3][4];

    arUtilMatInv(object[0].trans, wmat1);
    arUtilMatMul(wmat1, object[1].trans, wmat2);

where object[0].trans is a transformation matrix from marker#0 to the camera,
object[1].trans is a transformation matrix from marker#1 to the camera,
and wmat2 is a a transformation matrix from marker#1 to marker#0.

-- 
------------------------------------------------------------------
  Hirokazu Kato
  Faculty of Information Sciences
  Hiroshima City University               Phone: 082-830-1705
  Email: kato@s ........................     Fax: 082-830-1435
  URL: http://www.sys.im.hiroshima-cu.ac.jp/people/kato/