This prevented rapid switching between negative and positive parallax images, something that can make viewers dizzy and nauseous.
如此一來，即使場內的追逐忽焉在前、忽焉在後，拍出來的影像仍多屬「凹入」式的「負視差」畫面，而不會出現正、負視差影像急速交錯，以免讓觀眾看得頭暈想吐。