add_model_closed_callback ( model,  callback )

background_color ()

chimera_color ( rgb )

clip_plane_positions ()

float_variable_value ( v,  default=None )

normalzed_screen_to_xyz_coordinates (
        xy_n,
        z,
        view,
        )

scale_bar_dialog ( create=0 )

show_scale_bar ()

xyz_to_normalzed_screen_coordinates ( xyz,  view )