Box select (interface)
From MagicaVoxel Community Wiki
Allows selecting voxels within a dynamic window.
2 types of selection are available:
LButtondefines the 3D limits of a selection cube (2 opposite corners). Every voxel within this cube is selected.
SHIFTto select multiple boxes
ALT+SHIFTto remove boxes
LButtondefines a 2D rectangular window (2 opposite corners). Every voxel within this window is selected.
Modifiers are the same as Box selection.