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All models must work fine with backface culling
所有模型必須應(yīng)用隱面剔除。
Fixing backface culling generally needs you to select all faces that are incorrectly culled , and to flip their normal
要修復(fù)此問題，通常需要反轉(zhuǎn)所有沒有正確應(yīng)用剔除的面的法線方向。
Backface culling will ensure that only one of the two surfaces will be displayed in the z - buffer anyway , meaning that there won ' t be any z - fighting problem
因?yàn)殡[面剔除使得兩個(gè)面只有一個(gè)會(huì)顯示出來(lái)，這樣z緩沖就不會(huì)出現(xiàn)沖突了。
If some of your triangles are clockwise and others are anti - clockwise , backface culling will be messed up , and holes will randomly appear in the mesh when viewer in real - time
如果有些用順時(shí)針，有些逆時(shí)針，隱面剔除就會(huì)發(fā)生錯(cuò)誤，實(shí)時(shí)檢測(cè)模型時(shí)就會(huì)看見網(wǎng)格上有隨機(jī)出現(xiàn)的漏洞。
24 frisken s f , perry r n . simple and efficient traversal methods for quadtrees and octrees . j . graphics tools , 2002 , 7 : 1 - 11 . 25 zhang h , hoff k . fast backface culling using normal masks
實(shí)驗(yàn)表明，新方法能將順序點(diǎn)模型樹的繪制效率提高20 % 64 . 6 % ，并且越近觀察模型或模型中的遮擋關(guān)系越復(fù)雜時(shí)，新方法的加速比更高。