Levels

Level 0 plus its mips, down to one sample: log2(Side) + 1.

Declaration

uint32_t Levels() const;

Header: #include "Native/BrushMask.h"
Module: PublicDependencyModuleNames.Add("OrreryTerrainCore"); in your module’s Build.cs.
Stability: Experimental: supported, may change in a minor version, with a changelog line.
Thread: Tier 1, plain C++: any thread may read a mask. (the rule of FBrushMask)