Visual clue of what is "above" with layer tool, indicate what is on top of a block in cut-off view

Similar to the way (bad)water shows a crosshatch mark when it exceeds or is at the layer height in the layer tool. Terrain should also show distinct visual texture when there is dirt , "air", or a structure directly above it. Shadows, crosshatch, or other indicator. This way you can more easily align caves, vertical power shafts, stairs and most importantly not blast too close to above items and cause flooding with pressurized water canals.

Lower_Layer_rd95ln.png

Upper_Layer_xkvsio.png