RE: center of rotation for three-d views?

• To: visad@xxxxxxxxxxxxxxxx
• Subject: RE: center of rotation for three-d views?
• From: "McCann, Mike" <mccann@xxxxxxxxx>
• Date: Tue, 16 Dec 2003 13:56:51 -0800

> -----Original Message-----
> From: Bill Hibbard [mailto:billh@xxxxxxxxxxxxx] 
> Sent: Tuesday, December 16, 2003 7:38 AM
> To: Donna L Gresh
> Cc: visad@xxxxxxxxxxxxxxxx
> Subject: Re: center of rotation for three-d views?
> 
> 
> Hi Donna,
> 
> > I have a three-dimensional view, and I am wondering, when I rotate 
> > using the mouse (the default action), what is the "center of 
> > rotation"? It doesn't seem to be the center of my object (which is 
> > what I would like). Is there a way to change the center of rotation?
> 
> The center of rotation for mouse rotations in a 
> DisplayImplJ3D should be the origin of 3-D graphics 
> coordinates. That is, (0.0, 0.0, 0.0) in (XAxis, YAxis, 
> ZAxis). However center of your object may not be at this 
> origin. It depends on the explicit or implict (auto-scaled) 
> calles to setRange() for your ScalarMaps to XAxis, YAxis and ZAxis.
>   

This center of rotation issue is one of interest to me.  I think 
navigation within 3D space using standard computer interfaces is a 
problem that may be helped by the ability to dynamically change 
the center of rotation.  Is this possible in VisAD?

-Mike

--
Mike McCann (mccann at mbaridotorg)
Monterey Bay Aquarium Research Institute
7700 Sandholdt Road
Moss Landing, CA 95039-9644
Voice: (831) 775-1769 Fax: (831) 775-1646 http://www.mbari.org/rd/iag.htm
 

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