R help - Apr 2011 - Defining origin for rotation in RGL device

Hi all,

How can I tell RGL to set the center for the rotation to the origin of  the
coordinate system (0,0,0).
It seems that the default is to use the center of the display not the origin of
the coordinate system.

open3d()
lines3d(c(0, 1), c(0,0), c(0,0))
lines3d(c(0,0), c(0, 1), c(0,0))
lines3d(c(0,0), c(0,0), c(0, 1))

TIA
Mark

???????????????????????????????????????
Mark Heckmann
Blog: www.markheckmann.de
R-Blog: http://ryouready.wordpress.com

On 25/04/2011 5:46 AM, Mark Heckmann wrote:
> Hi all,
>
> How can I tell RGL to set the center for the rotation to the origin of  the
coordinate system (0,0,0).
> It seems that the default is to use the center of the display not the
origin of the coordinate system.
>
> open3d()
> lines3d(c(0, 1), c(0,0), c(0,0))
> lines3d(c(0,0), c(0, 1), c(0,0))
> lines3d(c(0,0), c(0,0), c(0, 1))
>
You can attach any transformation you like to a mouse button.  See the 
"mouseCallbacks" demo for R implementations of the standard ones, and 
modify the mouseTrackball function there to choose the position of the 
origin of the coordinate system as the centre of rotation.

Duncan Murdoch