[Chimera-users] Finding dimensions of density map

[Elaine Meng]

Hi Ryan,
I think I did understood you: My suggestion to save the volume outline box as a molecule would give you 8 atoms at the corners, in PDB format.  However, there is no similar thing to get a collective bounding box for multiple datasets.  You’d just have to get a box for each volume data set and then figure out for yourself the min and max in each dimension among all the boxes.  As Tom G said, if this is something you want to do repeatedly, python scripting may be the only reasonable approach.
Elaine

> On Jul 11, 2019, at 4:05 PM, Ryan Harlich <ryanharlich at hotmail.com> wrote:
> 
> I tried doing what you suggested and not sure how voxel size and origin will give you the bounding box. The other suggestion I am not sure if you understood what I am trying to accomplish or I did not understand what you were suggesting.
>  
> I am basically trying to get the bounding box. I tried with one atom and its bounding box would be small so what I did cut my volume. So I thought instead of one atom I can get eight atoms in all corners so when I resample it does not cut any of my volume because of the bounding box. I also want the biggest bounding box of two volumes.
>  
> Best,
> Ryan Harlich
>  
> Sent from Mail for Windows 10
>  
> From: Ryan Harlich
> Sent: Thursday, July 11, 2019 1:29:22 PM
> To: chimera-users at cgl.ucsf.edu BB
> Subject: RE: [Chimera-users] Finding dimensions of density map
>  
> Hi Elaine,
>  
> I am doing it no GUI via command line so I cannot select with mouse.
>  
> Thanks,
> Ryan Harlich
>  
> Sent from Mail for Windows 10
>  
> From: Elaine Meng <meng at cgl.ucsf.edu>
> Sent: Thursday, July 11, 2019 12:49:19 PM
> To: Ryan Harlich
> Cc: chimera-users at cgl.ucsf.edu
> Subject: Re: [Chimera-users] Finding dimensions of density map
>  
> Hi Ryan,
> The “Coordinates” section of Volume Viewer (open from its Features  menu) gives values used to convert between the dataset grid and Cartesian coordinates.  You’d have to back-calculate from the origin index and voxel size.
> 
> <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/volumeviewer/framevolumeviewer.html>
> <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/volumeviewer/volumeviewer.html#coordinates>
> 
> Another approach might be to show the volume outline box and then use the “meshmol” command to make it into a (pseudo)atomic model.  That will also make the volume isosurface triangles into atoms, but you can select just the box part and write selected-only as a PDB file.  E.g. if the volume model is #4, command:
> 
> meshmol #4 1
> 
> <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/meshmol.html>
> 
> then,
> … Ctrl-click on one corner of box to select atom, press up arrow one time to promote to whole box
> ...use “write” command or File… Save PDB with their respective option to save only the selected part
> 
> I hope this helps,
> Chimera  ;-)
> -----
> Elaine C. Meng, Ph.D.
> UCSF Chimera(X) team
> Department of Pharmaceutical Chemistry
> University of California, San Francisco
> 
> > On Jul 11, 2019, at 10:57 AM, Ryan Harlich <ryanharlich at hotmail.com> wrote:
> > 
> > Hi Chimera,
> >  
> > I want to plot 8 voxels (atoms) in a pdb such that they are the slightly greater than the greatest bounding box of two mrc density maps. In order to do that I need the dimensions of both mrc density maps or there eight greatest corners. How would I go about doing this; that is, getting the 8 corners of the mrc density maps? Is there a command to help this process?
> >  
> > Best,
> > Ryan Harlich
> 
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