Target for maximum depth of the Mesh Distance Field atlas, in 8^3 bricks. 32 => 128 * 128 * 32 * 8^3 = 256Mb. Actual atlas size can go over since mip2 is always loaded.
Usage
r.DistanceFields.BrickAtlasMaxSizeZ [value]
Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.
