環(huan)幕(mu)(mu)(mu)(mu)影(ying)院(yuan)不同于(yu)一般的電影(ying)屏幕(mu)(mu)(mu)(mu)，環(huan)幕(mu)(mu)(mu)(mu)電影(ying)采用柱面(mian)投影(ying)屏幕(mu)(mu)(mu)(mu)，將觀(guan)賞面(mian)圍(wei)繞在中心。環(huan)幕(mu)(mu)(mu)(mu)影(ying)院(yuan)的根據屏幕(mu)(mu)(mu)(mu)弧包圍(wei)狀(zhuang)況分(fen)為：環(huan)幕(mu)(mu)(mu)(mu)、弧幕(mu)(mu)(mu)(mu)、360°環(huan)幕(mu)(mu)(mu)(mu)等幾個方式(shi)，通常的定義(yi)標準是：弧度(du)小于(yu)180度(du)稱(cheng)(cheng)作弧幕(mu)(mu)(mu)(mu)，弧度(du)大于(yu)180度(du)稱(cheng)(cheng)作環(huan)幕(mu)(mu)(mu)(mu)，弧度(du)為360度(du)全(quan)封閉稱(cheng)(cheng)作360度(du)環(huan)幕(mu)(mu)(mu)(mu)。
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