It is impossible to record usable live sound at the Rere falls due to the noise of the waterfall. We therefore needed to mix live action shots at Rere with green screen work in the controlled environment of a green screen studio.

Also, without giving away too many spoilers, for a portion of the film, Kōkā is imprisoned within her crystal ball and this required careful planning to match up live action shots of the young Aroha holding the ball and green screen work of Kōkā within the ball. And if we do our job properly, it all looks seamless on the screen.