Finding the orientation of the marker

Hi,

I'm using the ARToolkit and in my application I would like to know what
the orientation and position of the marker cards so I can manipulate the
objects on the card.

The marker card position is fairly easy to get to following one of the
example programs (collideTest I think):

    x = object[i].trans[0][3];
    y = object[i].trans[1][3];
    z = object[i].trans[2][3];

Is this right? Or is there a better way to do it?

What about orientation in each axis? For example to know what the angle in
the x axis is. Is it possible to decompose the trans matrix to discover
this (and if so how?) or is it accessible when the marker is recognised.

Thanks

Patrick Sinclair

From:	Patrick AS Sinclair <pass99r@e ..............>	Received:	Dec 1, 2000
To	artoolkit@h ..................
Subject:	Finding the orientation of the marker
Hi, I'm using the ARToolkit and in my application I would like to know what the orientation and position of the marker cards so I can manipulate the objects on the card. The marker card position is fairly easy to get to following one of the example programs (collideTest I think): x = object[i].trans[0][3]; y = object[i].trans[1][3]; z = object[i].trans[2][3]; Is this right? Or is there a better way to do it? What about orientation in each axis? For example to know what the angle in the x axis is. Is it possible to decompose the trans matrix to discover this (and if so how?) or is it accessible when the marker is recognised. Thanks Patrick Sinclair