An algorithm for simulating wind-ripples and moving sand is extended by the detection of fixed objects. This
permits us simulation and animation of sand interacting with objects like houses, highways, cactuses, etc. Sand is
accumulated on the windward side of an obstacle and the sand relocation and wind-ripples formation is diminished
on the leeward side. The wind shadow depends on the object’s geometry and the wind speed and direction. Sand
tongues are formed as the result of the sand motion
