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Often you want to move a ligand (or some such) from wherever it was read in to the position of interest in your molecule (i.e. the current view centre). There is a GUI to do this: Calculate -> Move Molecule Here.
There are scripting functions available for this sort of thing:
(molecule-centre imol)
will tell you the molecule centre of the imolth molecule.
(translate-molecule-by imol x-shift y-shift z-shift)
will translate all the atoms in molecule imol by the
given amount (in Ångströms).
(move-molecule-to-screen-centre imol)
will move the imolth molecule to the current centre of the screen (sometimes useful for imported ligands). Note that this moves the atoms of the molecule - not just the view of the molecule.