修改UE4的deriveddatacache目录位置，扩大C盘空间

按照默认安装目录，UE4会装在C盘

C:\Program Files\Epic Games\UE_4.15

DerivedDataCache缓存目录在

C:\Users\你的用户名\AppData\Local\UnrealEngine\Common\DerivedDataCache

可以通过修改

C:\Program Files\Epic Games\UE_4.15\Engine\Config\BaseEngine.ini

中的[InstalledDerivedDataBackendGraph]条目下的

Local=(Type=FileSystem, ReadOnly=false, Clean=false, Flush=false, PurgeTransient=true, DeleteUnused=true, UnusedFileAge=34, FoldersToClean=-1, Path="%ENGINEVERSIONAGNOSTICUSERDIR%DerivedDataCache")

中的%ENGINEVERSIONAGNOSTICUSERDIR%DerivedDataCache

修改为%GAMEDIR%DerivedDataCache，修改完的内容为

Local=(Type=FileSystem, ReadOnly=false, Clean=false, Flush=false, PurgeTransient=true, DeleteUnused=true, UnusedFileAge=34, FoldersToClean=-1, Path="%GAMEDIR%DerivedDataCache")

修改好之后重新打开你的项目缓存路径将会生成在你的项目文件夹内