TransformSelectionByCameraView
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This little script was posted to the PyMol list. It will orient the molucule like cmd.orient() does, but does so by the camera view.
https://sourceforge.net/p/pymol/mailman/message/10097639/
# transform selection coordinates by the camera view
#
# The script answers this:
# Thanks!
# But translate[x,y,z] only translate the molecule.
# What I want is to put longest length of molecule in the X axes, the
# second Y axes, the third z axes.
# Just like what orient command does which change the view of camera but
# not the coordinates.
# Now I want the coordinates also change after orient it.
#
cv=list(cmd.get_view())
cmd.transform_selection("all", \
cv[0:3]+[0.0]+ \
cv[3:6]+[0.0]+ \
cv[6:9]+[0.0]+ \
cv[12:15]+[1.0], transpose=1)
cmd.reset()