= Flip Atom Z Coordinates =

Here is Python code defining a command flip that changes atom z coordinates z -> -z.   This changes the hand of the atomic structure, for instance changing all L amino acids to D amino acids.  Open flip.py in ChimeraX 1.0 to define the flip command

{{{
open flip.py
}}}

then use the command on the atomic model.

{{{
flip #1
}}}

[[Image(flip.png, 500px)]]

Here is the [attachment:flip.py flip.py] code:

{{{
# Create command to change atom coordiates z -> -z.
# Opening this file in ChimeraX 1.0 defines the flip command.
#
#  flip #1

def flip(session, atoms):
    xyz = atoms.coords
    xyz[:,2] *= -1
    atoms.coords = xyz

def register_command(session):
    from chimerax.core.commands import CmdDesc, register
    from chimerax.atomic import AtomsArg
    desc = CmdDesc(required=[('atoms', AtomsArg)],
                   synopsis='flip atom z coordinates')
    register('flip', desc, flip, logger=session.logger)

register_command(session)
}}}