3D industrial render of a wave-powered dual-cylinder generator system inside a transparent water tank. Left cylinder is in heavy mode: both hatches closed, cylinder filled with seawater, moving downward. Right cylinder is in light mode: both hatches open, water flows freely through it, rising upward. Both cylinders are connected by cables to a pulley mechanism above the tank surface. Pulley drives a DC generator on a metallic frame. Show arrows for motion directions. High detail, clear water simulation, bubbles, reflections, stainless steel textures, mechanical realism, engineering-style visualization, same style as professional scientific renders. See more