Revert get_3d to deprecated get3d for 0.4.x compatibility

SmallJoker

2018-08-04 9b40d02fbd9e8c39c5c64cc7de89a7fe45382f04

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RealBadAngel <maciej.kasatkin@o2.pl> <mk@realbadangel.pl>
Vanessa Ezekowitz <vanessaezekowitz@gmail.com>
Vanessa Ezekowitz <vanessaezekowitz@gmail.com> <vanessa@rainbird.(none)>
kaeza <kaeza@users.sf.net> Diego Martínez <kaeza@users.sf.net>