[Chimera-users] save volume histogram transfer function

[Tom Goddard]

Hi Jeff,

  Unfortunately the Chimera volume dialog won't tell you the exact 
height of the nodes on the histogram.  I'll add that to the requested 
features list.  Attached is a script that will print those values for 
the active volume in a format that can be used on other volumes with the 
"volume" command.

    File/Open tfunc.py, reply log shows:

       level -6.92021e-16,0 level 0.391341,0.99 level 0.581401,1

    Command to use these levels on volume with id 3:
    
        volume #3 level -6.92021e-16,0 level 0.391341,0.99 level 0.581401,1

or on volumes 4 through 8:

        volume #4-8 level -6.92021e-16,0 level 0.391341,0.99 level 
0.581401,1

The pairs of numbers are data value and "brightness" (= height on 
histogram, range 0-1).  The numbers also appear in Chimera session files 
-- search for "solid_levels" to find them.  Lastly, the heights of the 
intial 3 nodes are always 0, 0.99, and 1.0.

    Tom


Jeff wrote:
> hello,
>
> is there a way for me to save the histogram transfer function that is 
> displayed in Volume Viewer? I see that I can write down where the nodes 
> are placed as these values appear in the "Level" dialog, but do not see 
> a place to input magnitude (or write it down) of each node on the line. 
> Ideally, I would just like to save it out, to apply the identical 
> transform to multiple segmented areas of a volume.
>
> thanks,
>
> -jeff
>
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