When I wrote ColouredVoxel2Ldr I used an ordered packing mechanism of bricks (or plates - but not both) to fill the space defined by the voxel model. Here I wanted to use random bricks and plates (in the same build) to fill the spaces. "Opps" is an example of that packing technique where bricks and plates are packed into an 8x8 grid at 100% density (so every space is filled). For this image the 100% packed tower was imported into LDCad, where I separated it the middle and then scattered some of the separated brick/plate elements on the ground plane. The final image was rendered in Blender 2.8
