About this 3D model

finds the intersection of a 2-dimensional grid consisting of (xmax-xmin)*(ymax-ymin)*gridsizemultiplier 0.9x0.9x1 unit rectangular prisms, separated by 0.1 unit of space, and an stl. It shows this grid 1 layer at a time, to allow the user to better create minecraft sculptures from STLs. This is the entire purpose.