Official tutorial redshift 06 opt parameters

To sum up ： For primary sampling Anisotropic Anisotropic filter calculation mapping is the most accurate ,BIlinear Bilinear sum Point The calculation is not so accurate ;Mipmap Texture mapping I said before , It's an optimization , Now rendering software is generally this technology, such as UE So is the engine ;
copy pre-convertedtextures to cache folder It means that you will RS Copy the map in format to the cache folder , Can improve rendering speed , Here's the picture Arnold It is also possible to convert all maps into text .tx Format , In other words, it supports Mipmap technology ;

Global coverage , You can globally control whether rendering is turned on ;