[chimerax-users] Save cropped map visible coordinates

[Tom Goddard]

Hi Isabelle,

  The command "volume add" adds the densities of the two maps.  So where the overlap you will get higher density.  Even if you are showing a surface of each map such that the surfaces do not overlap, the map values extend outside those surfaces and can create the higher densities.

  You can instead use "volume maximum #1,2" which will take the maximum density at each grid point so it will handle overlaps better.

  Using volume maximum worked for me in older ChimeraX 1.1, for example

open 1080 from emdb
open 1080 from emdb
move z 130 model #2 coord #2
volume maximum #1,2

But in the current ChimeraX 1.2.5 it didn't get the combined map bounds right, and instead the resulting map had the bounds of the first map.  I have fixed that bug -- the fix will be in tonights daily build.

	Tom



> On Aug 25, 2021, at 5:22 PM, Isabelle Phan via ChimeraX-users <chimerax-users at cgl.ucsf.edu> wrote:
> 
>> 
>> "volume add” also fails to preserve the relative orientation.
> 
> I meant to write: "volume add" fails to preserve the map densities.
> 
> Sorry,
> I.
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