The mipmap level to load.
By default, the mipmap streaming system selects which mipmap to load based on the position of all Cameras. Setting this field forces a specific mipmap to be loaded and overrides the mipmap streaming system. The mipmap level can still be modified by budgeting memory. Use the streamingMipmapsPriority property to increase the chance of a particular Texture mipmap level being selected by the mipmap streaming system. The requested level is unaffected by minimumMipmapLevel
The value of requestedMipmapLevel is an exact mipmap level that ranges from 0 to the maximum mipmap level of the specific texture, or the Max Level Reduction value if that's lower. 0 is the highest resolution mipmap level.
Additional resources: ClearRequestedMipmapLevel, minimumMipmapLevel.