Thank you for the help. according to what you said, i need to computed
the euler matrix by myself. could any one tell me what is euler matrix
and how to compute it?

Regards

Yongjin


Fabien Rohrer wrote:
>
>
>
> Hi Yongjin,
>
> First of all, /wb_supervisor_get_sf_rotation/ (documented here
>
<http://www.cyberbotics.com/cdrom/common/doc/webots/reference/section3.41.html#w\
b_supervisor_field_get_sf_bool>)
> is effectively a function of the supervisor and so it is not usable from
> an EDU version. This function is used to get the current orientation
> relatively to the parent node of the given node (here, the GPS solid).
>
> The old GPS was overkilled because it gave information that none of any
> real device can return (both the position and the exact orientation). As
> the policy of the new API is to render accessible the non realistic only
> from the supervisor, we decided to split into several more specialized
> devices such as the new GPS and the Compass which allows the same
> abilities than the old GPS. Basically, if you need:
>
> * the position of your robot, use the new GPS device with the
> wb_gps_get_values function
> * the orientation of your robot according to the north, use the
> Compass device with the wb_compass_get_values function
>
> The orientation given by the old GPS matrix was a little more powerful
> than the one given by the compass, i.e., getting the orientation along
> the Compass-North axis is no more possible with the new API unless to
> use 2 perpendicular compasses. So the euler matrix is no more directly
> available but must be computed by yourself if needed.
>
> I hope this is clear enough!?
> Regards,
> Fabien
>
>
> 2009/7/7 <yl3908@... <mailto:yl3908@...>>
>
> Hi,
>
>
> I was converting some code written in webots5 to webots6. the code
> invole two method gps_get_matrix() and
> gps_euler().
>
> >From the file giving online said that
> The rotation of an object must now be estimated either by using the
> new Compass device, or with the new
> wb_supervisor_field_get_sf_rotation() function.
>
> Webots 5 (deprecated) Webots 6
> gps_get_matrix() wb_compass_get_values()
> gps_euler() wb_supervisor_field_get_sf_rotation()
>
> I have replace the gps_get_matrix() method by
> wb_compass_get_values(). But I cann't found the method
> wb_supervisor_field_get_sf_rotation() in the API. It seem that this
> method are in the supervisor class. but I am using education
> license. Is that mean I can not replace the gps_euler() method? What
> I can do then?
>
> Regards
>
> Yongjin
>
> .
>
>
>