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修订《实时光线追踪技术:业界发展近况与未来挑战》

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Original file line number	Diff line number	Diff line change
`@@ -493,7 +493,7 @@ meshes)来进行光照,非常赞。`
`493`	`493`
`494`	`494`	`![](media/487aa87eac891248f93343e3a1280c8d.png)`
`495`	`495`
`496`		`-因为像素四阶导数(pixel quadderivatives)只能用于光栅化,所以光线追踪无法自动进行Texture LOD。`
	`496`	`+因为从2x2像素块(pixel quad)中求解出的导数(pixel quad derivatives),只能用于光栅化,所以光线追踪无法自动进行Texture LOD。`
`497`	`497`
`498`	`498`	`- 目前的主流方案是依赖于光线差分(Ray Differentials)方法,但其对性能有一定的影响。`
`499`	`499`

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