[Chimera-users] about transformation matrix
goddard at cgl.ucsf.edu
Tue Jul 27 15:10:33 PDT 2010
The matrixget command gives the placement of the map in Chimera world
coordinates. If you simply shift or rotate the map with the mouse this
changes. That is not what you want. You want the placement of the map
that was fit relative to the map it was fit into. That is what the Fit
in Map dialog reports in the Reply Log. Use that.
For transformations expressed at 3 by 4 matrices Chimera does the
rotation first (about 0,0,0) then the translation.
> I am doing fitting of two maps and am getting different values of the transformation parameters: the ones given in the window where I specify the options (these seem to be correct), and those given by using the command "matrixget" --- these give a very large translation vector, and moreover, I don't see any relation between that vector and the correct translation.
> Also, could you tell me what is the order used in Chimera: rotation, then translation? or translation, then rotation?
> Thank you very much.
> Julio Kovacs
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