Based on the theory of dynamic fracture mechanics, the mechanism of crack-forming among shot holes in the directional split of rock by controlled blasting is expounded.

For Directional lights Unity can use so called Cascaded shadow Maps (alternatively called "Parallel Split shadow Maps") which give very good shadow quality, especially for long viewing distances.

The high-aspect-ratio flying wing eliminates vertical tail and conventional rudder, and uses instead a split drag rudder with large deflection as its directional control surface.