[Vis5d-users] display the sigma level on Vis5D?

Hello,

I've been using vis5D for displaying the ocean modelling results. 
We are using the sigma coordiante in vertical axis. 
The sigma elvels are fixed at each computation point, but the real water depths represented by sigma levels  at varying  topography are different. 
When I put the nc file created by this sigma level on Vis5D, I assume that there should not any information on the the area shallower that the depth I designate to see. For example if I want to see the flow field at depth of 2000m, there should not any currents shallower that 2000m. On Vis5D, I still see the information at all grid points even I go down to 4000m, the dseepest point.
    I wish to see the flow data just on the area where water is filled.

  Does anyone have an idea how to deal with this problem? 

Thanks for your help, 
Cheers.

_________________________________________________________
 Chang S. Kim, Ph.D.               * email: su...@ko...       
 Korea Ocean R&D Institute        * URL: http://surfkim.kordi.re.kr 
 Digital Ocean & Virtual Environment Center. * URL: http://vrocean.kordi.re.kr
1270 Sadong Ansan 425-744 South Korea   /Voice&Fax: +82-(0)31-400-6340