[Chimera-users] surface view of large file in chimera

[Elaine Meng]

Hi Guiqing,
I assume you are talking about volume data (such as a density map)  
since the resolution of a molecular surface would not be adjusted  
automatically.  If so, you can just change the "step" in the Volume  
Viewer dialog to "1" to make sure the contour surface is based on the  
full data instead of a subsample.

There is another setting that automatically adjusts resolution when a  
large data set is opened.  In the Volume Viewer dialog, choose  
Features... Data display options.  Then there should be more options  
shown in the dialog, including "Adjust step to show at most..."  You  
can either change the number to something bigger, or just uncheck that  
option if you don't think your large datasets will be too slow to  
handle on your computer.  If you want those settings to apply to later  
uses of Chimera, choose "Features... Save default dialog settings"  
from the Volume Viewer dialog.

I hope this helps,
Elaine
-----
Elaine C. Meng, Ph.D.                          meng at cgl.ucsf.edu
UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab
Department of Pharmaceutical Chemistry
University of California, San Francisco
                      http://www.cgl.ucsf.edu/home/meng/index.html

On Feb 11, 2009, at 2:54 PM, G.-Q. Hu wrote:

> Hello,
>
> I am trying to show a large file by surface view in chimera. But I  
> found that the structure lost the detail and the surface was  
> smoothed. I guess there is a sampling problem for large file. Is  
> there any way to view the large file at the original resolution?
>
> Thanks.
> Guiqing