[phenixbb] gridding of maps & coot
Roger Martin
roger at quantumbioinc.com
Wed Mar 18 06:49:28 PDT 2015
On 03/17/2015 08:15 PM, Paul Emsley wrote:
> On 17/03/15 18:22, Roger Martin wrote:
>> and if symmetry operations are added to the ccp4 binary file coot has
>> issues with asu (asymmetric unit) fitting to the grid
>
> The nature of the issues that Coot has with ASU fitting to the grid is
> not clear to me.
It is the combination of grid dimensions from the determine_gridding(in
cctbx and not spacegroup aware) and the symmetry operators. I haven't
looked at coot's code but the behavior indicates it wants to avoid
interpolations.
if the grid dimension isn't fitting an integer number of ASU' in x or y
or z.
The second determine_gridding(in cctbx and spacegroup aware) works. But
phenix does not use it because it doesn't set the symmetry_flags in its
initialization of
http://cctbx.sourceforge.net/current/python/cctbx.maptbx.html#crystal_gridding
>
> Is the problem here that Coot (and CCP4's) ASU is inconsistent with
> that of cctbx (for a given spacegroup)?
>
> Paul.
>
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