[Chimera-users] copy transformation between volumes

Tom Goddard goddard at sonic.net
Thu Aug 29 13:55:07 PDT 2019

Hi Oleksiy,

  The "matrixcopy #1 #2" command should do what you want.  It does not matter that the voxel size is different.  The matrix being copied is one that transforms the model physical coordinate system (usually in Angstroms) to the world coordinate system (also in Angstroms).  The voxel size is how grid indices are converted to physical units (Angstroms) and is not a factor for aligning the two maps with matrixcopy.


> On Aug 29, 2019, at 1:35 PM, Oleksiy Kovtun <okovtun at mrc-lmb.cam.ac.uk> wrote:
> Dear community, 
> I need your advice on the following problem.
> I align map #1 to the reference volume using fit command, and then need to confer this transformation to map #2.
> This could be done by using matrixcopy command. However in this particular case #1 has twice larger voxel size than #2.
> It is understod, that since transformation matrix describes shifts in non-scaled pixels, I can not use matrixcopy command. 
> Is it correct to scale translations (column 4) in the fit matrix for #1 and apply it to #2   with matrixset command?
> Thank you and best regards, 
> Oleksiy
> Dr Oleksiy Kovtun
> Research Fellow
> Briggs group
> MRC Laboratory of Molecular Biology
> Francis Crick Avenue
> Cambridge
> CB2 0QH
> UK
> Tel: + 44 1223 267551
> Email: okovtun at mrc-lmb.cam.ac.uk <mailto:okovtun at mrc-lmb.cam.ac.uk>
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