Abstract: To achieve a more realistic and richer shifting field, such as water surface over which a jet-ski or other object travels, thereby heightening the interest and ambiance of the game.

Abstract: To achieve a more realistic and richer shifting field, such as water surface over which a jet-ski or other object travels, thereby heightening the interest and ambiance of the game. An image processing device for processing image data for moving an object such as a watercraft over a water surface in three-dimensional space. Comprises means for cyclically shifting the height at given positions of the water surface over time (CPU 101) and means for moving the watercraft while contacting the water (CPU 101). Determination of contact between watercraft and water surface, watercraft tilt correction, boat wake drawing processing, and the like are performed by the CPU 101.

Abstract: A sprinkler system for a vehicle running test course having an incline in the direction of the width of the vehicle running test course such that said vehicle running test course has a higher side and a lower side. The sprinkler system including a concave placement channel constructed on one or both sides of the vehicle running test course; multiple sprinklers capable of sprinkling water over the vehicle running test course being installed in the concave placement channel; a concave installation channel constructed on the higher side of the vehicle running test course; and multiple water sprinkler nozzles placed in the concave installation channel. The water sprinkler nozzles sprinkle water onto the higher side of the vehicle running test course such that the sprinkled water flows downward along the surface of the vehicle running test course toward the lower side of the vehicle running test course.